LegalizeThe Water Supply (Water Quality) Regulations 2001
Made: 7th December 2001
Laid before Parliament: 10th December 2001
Coming into force in accordance with regulation 1(2) to (5)
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PART I — GENERAL
Citation, commencement and application
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Interpretation
2
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PART II — WATER SUPPLY ZONES
Water supply zones
3
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PART III — WHOLESOMENESS
Wholesomeness
4
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PART IV — MONITORING OF WATER SUPPLIES
Interpretation and application of Part IV
5
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Monitoring: general provisions
6
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Sampling points
7
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Authorisation of supply points
8
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Numbers of samples
9
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Sampling: further provisions
10
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PART V — MONITORING — ADDITIONAL PROVISIONS
Interpretation of Part V
11
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Sampling for particular substances and parameters
12
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Sampling at treatment works
13
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Sampling at service reservoirs
14
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Sampling: new sources
15
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Collection and analysis of samples
16
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PART VI — INVESTIGATIONS, AUTHORISATION OF DEPARTURES AND REMEDIAL ACTION
Investigations: Schedule 1 parameters
17
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Investigations: indicator parameters
18
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Action by National Assembly for Wales
19
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Authorisation of temporary supply of water that is not wholesome
20
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Authorisations: terms and conditions
21
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Authorisations: other limitations
22
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Publicity for authorisations
23
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Revocation and modification of authorisations
24
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PART VII — WATER TREATMENT
Interpretation
25
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Treatment of raw water
26
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Risk assessment for cryptosporidium
27
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Procedure following risk assessment and prohibition of supply
28
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Treatment for cryptosporidium
29
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Contamination from pipes
30
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Application and introduction of substances and products
31
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Use of processes
32
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Offences
33
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PART VIII — RECORDS AND INFORMATION
Maintenance of records
34
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Provision of information
35
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Publication of information
36
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PART IX — FUNCTIONS OF LOCAL AUTHORITIES IN RELATION TO WATER QUALITY
Application and interpretation
37
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Duties of local authorities: supplementary provision
38
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PART X — ENFORCEMENT
Contraventions by water undertakers
39
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PART XI — AMENDMENT AND REVOCATION OF REGULATIONS AND SAVING AND TRANSITIONAL PROVISION
Amendment of the Water Supply (Water Quality) Regulations 1989
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Transitional provision: programmes of work
41
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Transitional provision: authorisations
42
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Revocation of Regulations and savings
43
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SCHEDULE 1 — PRESCRIBED CONCENTRATIONS AND VALUES
TABLE A — MICROBIOLOGICAL PARAMETERS
| Item | Parameters | Concentration or Value (maximum) | Units of Measurement | Point of compliance |
|---|---|---|---|---|
| 1. | Enterococci | 0 | number/100ml | Consumers' taps |
| 2. | Escherichia coli (E. coli) | 0 | number/100ml | Consumers' taps |
| Item | Parameters | Concentration or Value (maximum) | Units of Measurement | Point of compliance |
| --- | --- | --- | --- | --- |
| Note: | Note: | Note: | Note: | Note: |
| * Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). | * Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). | * Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). | * Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). | * Compliance required as to 95% of samples from each service reservoir (regulation 4(6)). |
| 1. | Coliform bacteria | 0 | number/100ml | Service reservoirs[^f01000] and water treatment works |
| 2. | Escherichia coli (E. coli) | 0 | number/100ml | Service reservoirs and water treatment works |
TABLE B — CHEMICAL PARAMETERS
| Item | Parameters | Concentration or Value (maximum) | Units of Measurement | Point of compliance |
|---|---|---|---|---|
| Notes: | Notes: | Notes: | Notes: | Notes: |
| (i) The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. | (i) The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. | (i) The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. | (i) The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. | (i) The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. |
| (ii) See also regulation 6(6). | (ii) See also regulation 6(6). | (ii) See also regulation 6(6). | (ii) See also regulation 6(6). | (ii) See also regulation 6(6). |
| (iii) See also regulation 4(2)(d). | (iii) See also regulation 4(2)(d). | (iii) See also regulation 4(2)(d). | (iii) See also regulation 4(2)(d). | (iii) See also regulation 4(2)(d). |
| (iv) See the definition of “pesticides and related products” in regulation 2. | (iv) See the definition of “pesticides and related products” in regulation 2. | (iv) See the definition of “pesticides and related products” in regulation 2. | (iv) See the definition of “pesticides and related products” in regulation 2. | (iv) See the definition of “pesticides and related products” in regulation 2. |
| (v) The parametric value applies to each individual pesticide. | (v) The parametric value applies to each individual pesticide. | (v) The parametric value applies to each individual pesticide. | (v) The parametric value applies to each individual pesticide. | (v) The parametric value applies to each individual pesticide. |
| (vi) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. | (vi) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. | (vi) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. | (vi) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. | (vi) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. |
| (vii) The specified compounds are: benzo(b)fluoranthene benzo(k)fluoranthene benzo(ghi)perylene indeno(1,2,3-cd)pyrene. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | (vii) The specified compounds are: benzo(b)fluoranthene benzo(k)fluoranthene benzo(ghi)perylene indeno(1,2,3-cd)pyrene. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | (vii) The specified compounds are: benzo(b)fluoranthene benzo(k)fluoranthene benzo(ghi)perylene indeno(1,2,3-cd)pyrene. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | (vii) The specified compounds are: benzo(b)fluoranthene benzo(k)fluoranthene benzo(ghi)perylene indeno(1,2,3-cd)pyrene. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | (vii) The specified compounds are: benzo(b)fluoranthene benzo(k)fluoranthene benzo(ghi)perylene indeno(1,2,3-cd)pyrene. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. |
| (viii) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | (viii) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | (viii) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | (viii) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | (viii) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. |
| (ix) The specified compounds are: chloroform bromoform dibromochloromethane bromodichloromethane. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | (ix) The specified compounds are: chloroform bromoform dibromochloromethane bromodichloromethane. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | (ix) The specified compounds are: chloroform bromoform dibromochloromethane bromodichloromethane. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | (ix) The specified compounds are: chloroform bromoform dibromochloromethane bromodichloromethane. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | (ix) The specified compounds are: chloroform bromoform dibromochloromethane bromodichloromethane. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. |
| 1. | Acrylamide | 0.10 | μg/l | [^f01001] |
| 2. | Antimony | 5.0 | μgSb/l | Consumers' taps |
| 3. | Arsenic | 10 | μgAs/l | Consumers' taps |
| 4. | Benzene | 1.0 | μg/l | Consumers' taps |
| 5. | Benzo(a)pyrene | 0.010 | μg/l | Consumers' taps |
| 6. | Boron | 1.0 | mgB/l | Consumers' taps |
| 7. | Bromate | 10 | μgBrO₃/l | Consumers' taps |
| 8. | Cadmium | 5.0 | μgCd/l | Consumers' taps |
| 9. | Chromium | 50 | μgCr/l | Consumers' taps |
| 10. | Copper[^f01002] | 2.0 | mgCu/l | Consumers' taps |
| 11. | Cyanide | 50 | μgCN/l | Consumers' taps |
| 12. | 1, 2 dichloroethane | 3.0 | μg/l | Consumers' taps |
| 13. | Epichlorohydrin | 0.10 | μg/l | [^f01001] |
| 14. | Fluoride | 1.5 | mgF/l | Consumers' taps |
| 15. | Lead[^f01002] | a 25, from 25th December 2003 until immediately before 25th December 2013 | μgPb/l | Consumers' taps |
| b 10, on and after 25th December 2013 | μgPb/l | Consumers' taps | ||
| 16. | Mercury | 1.0 | μgHg/l | Consumers' taps |
| 17. | Nickel [^f01002] | 20 | μgNi/l | Consumers' taps |
| 18. | Nitrate [^f01003] | 50 | mgNO₃/l | Consumers' taps |
| 19. | Nitrite [^f01003] | 0.50 | mgNO₂/l | Consumers' taps |
| 0.10 | Treatment Works | |||
| 20. | Pesticides [^f01004][^f01005] Aldrin ) Dieldrin ) Heptachlor ) Heptachlor ) epoxide ) | 0.030 | μg/l | Consumers' taps |
| other pesticides | 0.10 | μg/l | Consumers' taps | |
| 21. | Pesticides: Total [^f01006] | 0.50 | μg/l | Consumers' taps |
| 22. | Polycyclic aromatic hydrocarbons [^f01007] | 0.10 | μg/l | Consumers' taps |
| 23. | Selenium | 10 | μgSe/l | Consumers' taps |
| 24. | Tetrachloroethene and Trichloroethene [^f01008] | 10 | μg/l | Consumers' taps |
| 25. | Trihalomethanes: Total [^f01009] | 100 | μg/l | Consumers' taps |
| 26. | Vinyl chloride | 0.50 | μg/l | [^f01001] |
| Item | Parameters | Concentration or Value (maximum unless otherwise stated) | Units of Measurement | Point of compliance |
| --- | --- | --- | --- | --- |
| 1. | Aluminium | 200 | μgAl/l | Consumers' taps |
| 2. | Colour | 20 | mg/l Pt/Co | Consumers' taps |
| 3. | Hydrogen ion | 10.0 | pH value | Consumers' taps |
| 6.5 (minimum) | pH value | Consumers' taps | ||
| 4. | Iron | 200 | μgFe/l | Consumers' taps |
| 5. | Manganese | 50 | μgMn/l | Consumers' taps |
| 6. | Odour | 3 at 25°C | Dilution number | Consumers' taps |
| 7. | Sodium | 200 | mgNa/l | Consumers' taps |
| 8. | Taste | 3 at 25°C | Dilution number | Consumers' taps |
| 9. | Tetrachlorome-thane | 3 | μg/l | Consumers' taps |
| 10. | Turbidity | 4 | NTU | Consumers' taps |
SCHEDULE 2 — INDICATOR PARAMETERS
| Item | Parameters | Specification Concentration or Value (maximum) or State | Units of Measurement | Point of monitoring |
|---|---|---|---|---|
| Notes: | Notes: | Notes: | Notes: | Notes: |
| (i) The water should not be aggressive. | (i) The water should not be aggressive. | (i) The water should not be aggressive. | (i) The water should not be aggressive. | (i) The water should not be aggressive. |
| (ii) Excluding tritium, potassium-40, radon and radon decay products. | (ii) Excluding tritium, potassium-40, radon and radon decay products. | (ii) Excluding tritium, potassium-40, radon and radon decay products. | (ii) Excluding tritium, potassium-40, radon and radon decay products. | (ii) Excluding tritium, potassium-40, radon and radon decay products. |
| * May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | * May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | * May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | * May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. | * May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution. |
| 1. | Ammonium | 0.50 | mgNH₄/l | Consumers' taps |
| 2. | Chloride [^f01010] | 250 | mgCl/l | Supply point[^f01012] |
| 3. | Clostridium perfringens (including spores) | 0 | Number/100ml | Supply point[^f01012] |
| 4. | Coliform bacteria | 0 | Number/100ml | Consumers' taps |
| 5. | Colony counts | No abnormal change | Number/1ml at 22°C | Consumers' taps, service |
| Number/1ml at 37°C | Reservoirs and treatment works | |||
| 6. | Conductivity [^f01010] | 2500 | μS/cm at 20°C | Supply point[^f01012] |
| 7. | Hydrogen ion | 9.5 | pHvalue | Consumers' taps |
| 8. | Sulphate [^f01010] | 250 | mgSO₄ /l | Supply point[^f01012] |
| 9. | Total indicative dose (for radioactivity) [^f01011] | 0.10 | mSv/year | Supply point[^f01012] |
| 10. | Total organic carbon (TOC) | No abnormal change | mgC/l | Supply point[^f01012] |
| 11. | Tritium (for radioactivity) | 100 | Bq/l | Supply point[^f01012] |
| 12. | Turbidity | 1 | NTU | Treatment works |
SCHEDULE 3 — MONITORING
TABLE 1 — PARAMETERS AND CIRCUMSTANCES FOR CHECK MONITORING
| (1) | (2) | (3) |
|---|---|---|
| Item | Parameter | Circumstances |
| 1. | Aluminium | When used as flocculant or where the water originates from, or is influenced by, surface waters |
| 2. | Ammonium | |
| 3. | Clostridium perfringens (including spores) | Where the water originates from, or is influenced by, surface waters |
| 4. | Coliform bacteria | |
| 5. | Colony counts | |
| 6. | Colour | |
| 7. | Conductivity | |
| 8. | Escherichia coli (E. coli) | |
| 9. | Hydrogen ion | |
| 10. | Iron | When used as flocculant or where the water originates from, or is influenced by, surface waters |
| 11. | Manganese | Where the water originates from, or is influenced by, surface waters |
| 12. | Nitrate | When chloramination is practised |
| 13. | Nitrite | When chloramination is practised |
| 14. | Odour | |
| 15. | Taste | |
| 16. | Turbidity |
TABLE 2 — ANNUAL SAMPLING FREQUENCIES: WATER SUPPLY ZONES
| (1) | (2) | (3) | (4) |
|---|---|---|---|
| Substances and parameters subject to check monitoring | Estimated population of water supply zone | Reduced | Standard |
| Notes: | Notes: | Notes: | Notes: |
| * Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and (iii) below. | * Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and (iii) below. | * Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and (iii) below. | * Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and (iii) below. |
| (i) Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000. | (i) Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000. | (i) Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000. | (i) Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000. |
| (ii) Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required. | (ii) Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required. | (ii) Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required. | (ii) Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required. |
| (iii) Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points. | (iii) Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points. | (iii) Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points. | (iii) Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points. |
| (iv) To monitor for total indicative dose (for radioactivity). | (iv) To monitor for total indicative dose (for radioactivity). | (iv) To monitor for total indicative dose (for radioactivity). | (iv) To monitor for total indicative dose (for radioactivity). |
| E. coli | |||
| Coliform bacteria | <100 | 4 | |
| Residual disinfectant | ≥100 | 12 per 5,000 population[^f01014] | |
| Aluminium | |||
| Ammonium | |||
| Clostridium perfringens (including spores)[^f01013] | <100 | 1 | 2 |
| 100—4,999 | 2 | 4 | |
| 5,000—9,999 | 6 | 12 | |
| Colony counts | 10,000—29,999 | 12 | 24 |
| Colour | 30,000—49,999 | 18 | 36 |
| Conductivity[^f01013] | 50,000—79,999 | 26 | 52 |
| Hydrogen ion | 80,000—100,000 | 38 | 76 |
| Iron | |||
| Manganese | |||
| Nitrate[^f01015] | |||
| Nitrite[^f01015] | |||
| Odour | |||
| Taste | |||
| Turbidity | |||
| Parameters subject to audit monitoring | |||
| Aluminium | |||
| Antimony | |||
| Arsenic | |||
| Benzene[^f01013] | <100 | 1 | |
| Benzo(a)pyrene | 100—4,999 | 4 | |
| Boron[^f01013] | 5,000—100,000 | 8 | |
| Bromate[^f01016] | |||
| Cadmium | |||
| Chromium | |||
| Copper | |||
| Cyanide[^f01013] | |||
| 1,2 dichloroethane[^f01013] | |||
| Enterococci | |||
| Fluoride[^f01013] | |||
| Iron | |||
| Lead | |||
| Manganese | |||
| Mercury[^f01013] | |||
| Nickel | |||
| Nitrate [^f01015] | |||
| Nitrite [^f01015] | |||
| Pesticides and related products[^f01013] | |||
| Polycyclic aromatic | <100 | 1 | |
| hydrocarbons | 100—4,999 | 4 | |
| Selenium | 5,000—100,000 | 8 | |
| Sodium | |||
| Trichloroethene | |||
| /Tetrachloroethene[^f01013] | |||
| Tetrachloromethane[^f01013] | |||
| Trihalomethanes | |||
| Chloride[^f01013] | |||
| Sulphate[^f01013] | |||
| Total organic carbon[^f01013] | |||
| Tritium[^f01013] | |||
| Gross alpha[^f01013] [^f01017] | |||
| Gross beta[^f01013] [^f01017] |
TABLE 3 — ANNUAL SAMPLING FREQUENCIES: TREATMENT WORKS OR SUPPLY POINTS*
| (1) | (2) | (3) | (4) | (5) |
|---|---|---|---|---|
| Item | Substances and parameters | Volume of water supplied m³/d | Reduced | Standard |
| Notes: | Notes: | Notes: | Notes: | Notes: |
| * Sampling is at treatment works for the substances and parameters shown in column (1) of the Table as items 1 to 6 and at supply points for the other substances and parameters, except nitrite, subject to notes (ii) and (iii) below. | * Sampling is at treatment works for the substances and parameters shown in column (1) of the Table as items 1 to 6 and at supply points for the other substances and parameters, except nitrite, subject to notes (ii) and (iii) below. | * Sampling is at treatment works for the substances and parameters shown in column (1) of the Table as items 1 to 6 and at supply points for the other substances and parameters, except nitrite, subject to notes (ii) and (iii) below. | * Sampling is at treatment works for the substances and parameters shown in column (1) of the Table as items 1 to 6 and at supply points for the other substances and parameters, except nitrite, subject to notes (ii) and (iii) below. | * Sampling is at treatment works for the substances and parameters shown in column (1) of the Table as items 1 to 6 and at supply points for the other substances and parameters, except nitrite, subject to notes (ii) and (iii) below. |
| (i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3). | (i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3). | (i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3). | (i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3). | (i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3). |
| (ii) Sampling at treatment works when chloramination is practised. | (ii) Sampling at treatment works when chloramination is practised. | (ii) Sampling at treatment works when chloramination is practised. | (ii) Sampling at treatment works when chloramination is practised. | (ii) Sampling at treatment works when chloramination is practised. |
| (ii) Sampling at treatment works when chloramination is not practised. | (ii) Sampling at treatment works when chloramination is not practised. | (ii) Sampling at treatment works when chloramination is not practised. | (ii) Sampling at treatment works when chloramination is not practised. | (ii) Sampling at treatment works when chloramination is not practised. |
| (iv) Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones. | (iv) Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones. | (iv) Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones. | (iv) Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones. | (iv) Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones. |
| (v) To monitor for total indicative dose (for radioactivity). | (v) To monitor for total indicative dose (for radioactivity). | (v) To monitor for total indicative dose (for radioactivity). | (v) To monitor for total indicative dose (for radioactivity). | (v) To monitor for total indicative dose (for radioactivity). |
| 1. | E. Coli | <20 | 4 | |
| 2. | Coliform bacteria | 20—1,999 | 12 | 52 |
| 3. | Colony counts | 2,000—5,999 | 52 | 104 |
| 4. | Nitrite [^f01020] | 6,000—11,999 | 104 | 208 |
| 5. | Residual disinfectant | ≥12,000 | 104 | 365 |
| 6. | Turbidity | |||
| Subject to check monitoring | Subject to check monitoring | |||
| 7. | Clostridium perfringens[^f01019] | <20 | 2 | |
| 20 — 999 | 2 | 4 | ||
| 8. | Conductivity | 1,000 — 1,999 | 6 | 12 |
| 2,000 — 5,999 | 12 | 24 | ||
| 6,000 — 9,999 | 18 | 36 | ||
| 10,000 — 15,999 | 26 | 52 | ||
| 16,000 — 32,999 | 52 | 104 | ||
| 33,000 — 49,999 | 78 | 156 | ||
| 50,000 — 67,999 | 104 | 208 | ||
| 68,000 — 84,999 | 130 | 260 | ||
| 85,000 — 101,999 | 156 | 312 | ||
| 102,000 —119,999 | 183 | 365 | ||
| 120,000 — 241,999 | 365 | 730 | ||
| 242,000 — 484,999 | 730 | 1,460 | ||
| 485,000 — 728,999 | 1,095 | 2,190 | ||
| Subject to audit monitoring | Subject to audit monitoring | |||
| 9. | Benzene | |||
| 10. | Boron | |||
| 11. | Bromate [^f01022] | |||
| 12. | Cyanide | |||
| 13. | 1,2 dichloroethane | |||
| 14. | Fluoride | |||
| 15. | Mercury | <20 | 1 | |
| 16. | Nitrite [^f01021] | 20—999 | 4 | |
| 17. | Pesticides and Related products | 1,000—49,999 | 8 | |
| 50,000—89,999 | 12 | |||
| 90,000—299,999 | 24 | |||
| 300,000—649,000 | 36 | |||
| 18. | Trichloroethene ) Tetrachloroethene) | ≥650,000 | 48 | |
| 19. | Tetrachloromethane | |||
| 20. | Chloride | |||
| 21. | Sulphate | |||
| 22. | Total organic carbon | |||
| 23. | Tritium | |||
| 24. | Gross alpha [^f01023] | |||
| 25. | Gross beta [^f01023] |
SCHEDULE 4 — ANALYTICAL METHODOLOGY
TABLE A1 — PARAMETERS FOR WHICH, SUBJECT TO REGULATION 16(7), METHODS OF ANALYSIS ARE PRESCRIBED
| (1) | (2) |
|---|---|
| Parameter | Method |
| Clostridium perfringens (including spores) | Membrane filtration followed by anaerobic incubation of the membrane on m-CP agar* at 44 ± 1°C for 21 ± 3 hours. Count opaque yellow colonies that turn pink or red after exposure to ammonium hydroxide vapours for 20 to 30 seconds. |
| Coliform bacteria | ISO 9308-1 |
| Colony count 22°C — enumeration of culturable microorganisms | prEN ISO 6222 |
| Colony count 37°C— enumeration of culturable microorganisms | prEN ISO 6222 |
| Enterococci | ISO 7899-2 |
| Escherichia coli (E. coli) | ISO 9308-1 |
*The composition of m-CP agar is:
| Basal medium | |
|---|---|
| Tryptose | 30.0g |
| Yeast extract | 20.0g |
| Sucrose | 5.0g |
| L-cysteine hydrochloride | 1.0g |
| MgSO₄·7H₂O | 0.1g |
| Bromocresol purple | 40.0mg |
| Agar | 15.0g |
| Water | 1,000.0ml |
Dissolve the ingredients of the basal medium, adjust pH to 7.6 and autoclave at 121°C for15 minutes. Allow the medium to cool and add:
| D-cycloserine | 400.0mg |
|---|---|
| Polymyxine-B sulphate | 25.0mg |
| Indoxyl-[beta]-D-glucoside | 60.0mg |
| to be dissolved in 8ml sterile water before addition | |
| Filter — sterilised 0.5% phenolphthalein diphosphate solution | 20.0ml |
| Filter — sterilised 4.5% FeCl₃· 6H₂O | 2.0ml |
TABLE A2 — PARAMETERS IN RELATION TO WHICH METHODS OF ANALYSIS MUST SATISFY PRESCRIBED CHARACTERISTICS
| (1) | (2) | (3) | (4) |
|---|---|---|---|
| Parameters | Trueness % of prescribed concentration or value or specification | Precision % of prescribed concentration or value or specification | Limit of detection % of prescribed concentration or value or specification |
| Notes: | Notes: | Notes: | Notes: |
| (i) The method of analysis should determine total cyanide in all forms. | (i) The method of analysis should determine total cyanide in all forms. | (i) The method of analysis should determine total cyanide in all forms. | (i) The method of analysis should determine total cyanide in all forms. |
| (ii) The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned. | (ii) The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned. | (ii) The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned. | (ii) The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned. |
| (iii) The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1. | (iii) The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1. | (iii) The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1. | (iii) The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1. |
| (iv) The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1. | (iv) The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1. | (iv) The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1. | (iv) The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1. |
| (v) The performance characteristics apply to the prescribed value of 4NTU. | (v) The performance characteristics apply to the prescribed value of 4NTU. | (v) The performance characteristics apply to the prescribed value of 4NTU. | (v) The performance characteristics apply to the prescribed value of 4NTU. |
| (vi) The performance characteristics apply to the specification of 1NTU for water leaving treatment works. | (vi) The performance characteristics apply to the specification of 1NTU for water leaving treatment works. | (vi) The performance characteristics apply to the specification of 1NTU for water leaving treatment works. | (vi) The performance characteristics apply to the specification of 1NTU for water leaving treatment works. |
| Aluminium | 10 | 10 | 10 |
| Ammonium | 10 | 10 | 10 |
| Antimony | 25 | 25 | 25 |
| Arsenic | 10 | 10 | 10 |
| Benzene | 25 | 25 | 25 |
| Benzo(a)pyrene | 25 | 25 | 25 |
| Boron | 10 | 10 | 10 |
| Bromate | 25 | 25 | 25 |
| Cadmium | 10 | 10 | 10 |
| Chloride | 10 | 10 | 10 |
| Chromium | 10 | 10 | 10 |
| Colour | 10 | 10 | 10 |
| Conductivity | 10 | 10 | 10 |
| Copper | 10 | 10 | 10 |
| Cyanide[^f01024] | 10 | 10 | 10 |
| 1,2-dichloroethane | 25 | 25 | 10 |
| Fluoride | 10 | 10 | 10 |
| Iron | 10 | 10 | 10 |
| Lead | 10 | 10 | 10 |
| Manganese | 10 | 10 | 10 |
| Mercury | 20 | 10 | 20 |
| Nickel | 10 | 10 | 10 |
| Nitrate | 10 | 10 | 10 |
| Nitrite | 10 | 10 | 10 |
| Pesticides and related products[^f01025] | 25 | 25 | 25 |
| Polycyclic aromatic hydrocarbons[^f01026] | 25 | 25 | 25 |
| Selenium | 10 | 10 | 10 |
| Sodium | 10 | 10 | 10 |
| Sulphate | 10 | 10 | 10 |
| Tetrachloromethane | 20 | 20 | 20 |
| Trichloroethene[^f01027] | 25 | 25 | 10 |
| Trihalomethanes: Total[^f01026] | 25 | 25 | 10 |
| Turbidity[^f01028] | 10 | 10 | 10 |
| Turbidity [^f01029] | 25 | 25 | 25 |
SCHEDULE 5 — AMENDMENT OF THE WATER SUPPLY (WATER QUALITY) REGULATIONS 1989
The amendments to the 1989 Regulations referred to in regulation 40 are—
- (a) after regulation 13, the insertion of the following regulation—
(13A) (1) Subject to paragraphs (5) and (6), in each of the years 2002 and 2003, a water undertaker shall take, or cause to be taken, from its sampling points or, as the case may be, its supply points, for analysis for testing against the concentrations and values specified in column (2) of Table 4A for the organisms and substances listed in column (1) of that Table, not less than the number of samples specified in paragraphs (2) and (3). (2) In respect of supply points and the supply of a volume of water within a range shown in column (3) of that Table, the number is that shown in column (4) of that Table with the prefix “S” as applicable to a volume within that range. (3) In respect of sampling points and the supply of water to an estimated population within a range shown in column (5) of that Table, the number is that shown in column (6) of that Table with the prefix “S” as applicable to a population within that range. (4) In each of those years samples shall be taken at regular intervals throughout the year. (5) Where— (a) a programme of work has been approved or is treated as approved under regulation 41 (transitional provision: programmes of work) of the Water Supply (Water Quality) Regulations 2001; or has otherwise been agreed by the National Assembly for Wales; and (b) at least one of the steps required to be taken in accordance with that programme— (i) relates to an organism or substance listed in column (1) of Table 4A; and (ii) remains to be completed, the number of samples to be taken in any period of twelve months beginning with the date on which the programe was approved, treated as approved, or agreed (as the case may be) and ending on the day on which the last of those steps is completed, for analysis for testing for that organism or substance, may be the number shown in column (4) or, as the case may be, column (6) of that Table with the prefix “R”. (6) Where analysis of the samples taken by a water undertaker in 2002 in accordance with this regulation has established a concentration or value in respect of an organism or substance listed in column (1) of Table 4A that is significantly lower than the prescribed concentration or value, the number of samples to be taken in 2003, for analysis for testing for that organism or substance, may be the number shown in column (4) or, as the case may be, column (6) of that Table with the prefix “R”.
- (b) after regulation 20, the insertion of the following regulation—
(20A) The samples taken in accordance with regulation 13 shall additionally be tested against the concentrations and values specified in column (2) of Table 4B.
- (c) in regulation 21 (collection and analysis of samples)—
- (i) in paragraph (2), the insertion, after “means”, of “subject to paragraph (3)”; and
- (ii) the addition, at the end, of the following—
(3) In relation to each of the parameters and other substances listed in column (1) of Table 4B, paragraph (2)(d) shall have effect as if for sub-paragraph (iii) there were substituted the requirements of regulation 21A.
- (d) after regulation 21, the insertion of the following regulation—
(21A) (1) The method of analysis used for testing for a parameter or other substance listed in column (1) of Table 4B against the concentrations in column (2) of that Table must be capable, at the time of use— (a) of measuring concentrations with the trueness and precision specified in relation to that parameter or substance in columns (3) and (4) of Table 4B; and (b) of detecting the parameter or substance at the limit of detection specified in relation to it in column (5) of that Table. (2) For the purposes of paragraph (1)— - “limit of detection” is to be calculated as— three times the relative within batch standard deviation of a natural sample containing a low concentration of the parameter or substance; or five times the relative within batch standard deviation of a blank sample; - “precision” (the random error) is the standard deviation (within a batch and between batches) of the spread of results about the mean; and - “trueness” (the systematic error) is the difference between the mean value of a large number of repeated measurements and the true value.
- (e) in regulation 29, in paragraph (1)(f)—
- (i) after the words “Part IV of these Regulations”, the insertion of “, other than regulation 13A,”; and
- (ii) by the insertion, at the end, of “or regulation 29 of the Water Supply (Water Quality) Regulations 2001”; and
- (f) the insertion, after Table 4 in Schedule 3, of the following Tables—
| (1) | (2) | (3) | (4) | (5) | (6) |
|---|---|---|---|---|---|
| Organism or substance | Concentration or value and unit of measurement | Volume of water supplied m³/d | Annual sampling frequency | Estimated population of water supply zone | Annual sampling frequency |
| * where the water originates from, or is influenced by, surface waters | * where the water originates from, or is influenced by, surface waters | * where the water originates from, or is influenced by, surface waters | * where the water originates from, or is influenced by, surface waters | * where the water originates from, or is influenced by, surface waters | * where the water originates from, or is influenced by, surface waters |
| Benzene | 1.0μg/l | ||||
| Bromate | 1.0μgBrO₃/l | ||||
| ≤999 | S2 or R1 | ≤4,999 | S2 or R1 | ||
| Clostridium perfringens[^f01030] (Including spores) | 0 | 1,000—49,999 | S4 or R1 | 5,000—50,000 | S4 or R1 |
| ≤50,000 | |||||
| Number/ 100ml | S8 or R2 | ||||
| 1,2 dichloroethane | 3.0 μg/l | ||||
| Enterococci | 0 Number/100ml | ||||
| Nitrite | 0.10 mgNO₂/l | ||||
| (1) | (2) | (3) | (4) | (5) | |
| --- | --- | --- | --- | --- | |
| Parameter or other substance | Concentration and unit of measurement | Trueness % of concentration | Precision % of concentration | Limit of detection % of concentration | |
| * Trueness, precision and limit of detection apply to the individual substances specified at 50% of the concentration in column (2). | * Trueness, precision and limit of detection apply to the individual substances specified at 50% of the concentration in column (2). | * Trueness, precision and limit of detection apply to the individual substances specified at 50% of the concentration in column (2). | * Trueness, precision and limit of detection apply to the individual substances specified at 50% of the concentration in column (2). | * Trueness, precision and limit of detection apply to the individual substances specified at 50% of the concentration in column (2). | |
| Antimony | 5.0 μgSb/l | 25 | 25 | 25 | |
| Arsenic | 10 μgAs/l | 10 | 10 | 10 | |
| Benzene | 1.0 μg/l | 25 | 25 | 25 | |
| Boron | 1.0 mgB/l | 10 | 10 | 10 | |
| Bromate | 10 μBrO₃/l | 25 | 25 | 25 | |
| Copper | 2.0 mgCu/l | 10 | 10 | 10 | |
| 1,2 dichloroethane | 3.0 μg/l | 25 | 25 | 10 | |
| Lead | 25 μgPb/l | 10 | 10 | 10 | |
| Nickel | 20 μgNi/l | 10 | 10 | 10 | |
| Nitrite (ex works) | 0.1 gNO₂/l | 10 | 10 | 10 | |
| Tetrachloroethene[^f01031]) Trichloroethene[^f01031] ) | 10 μg/l | 25 | 25 | 10 |
SCHEDULE 6 — PROGRAMMES OF WORK
A water undertaker’s programme of work shall—
- (a) identify, by reference to the parameters set out in the Table below, those parameters in respect of which the requirements of regulation 41(1)(a) and (b) are unlikely to be satisfied unless steps are taken to secure that those requirements will be met;
- (b) identify whether the requirement that the formula [nitrate]/50 + [nitrite]/3 ≤1, where the square brackets signify the concentrations in mg/1 for nitrate (NO₃) and nitrite (NO₂), is unlikely to be satisfied;
- (c) specify the steps that the water undertaker intends to take for the purpose of securing that the requirements of regulation 41(1)(a) and (b) are met;
- (d) specify the date by which each of the steps specified in accordance with paragraph (c) is proposed to be completed; and
- (e) specify the times at which, or the periods within which, reports will be made to the National Assembly for Wales in relation to the taking and completion of the steps specified in accordance with paragraph (c).
TABLE
- Enterococci
- Acrylamide
- Antimony
- Arsenic
- Benzene
- Benzo(a)pyrene
- Boron
- Bromate
- Copper
- 1,2-dichloroethane
- Epichlorohydrin
- Lead
- Nickel
- Nitrite
- Polycyclic aromatic hydrocarbons
- Tetrachloroethene ) sum of concentrations
- Trichloroethene )
- Trihalomethanes — Total (sum of concentrations of chloroform, bromoform, dibromochloromethane and bromodichloromethane)
- Vinyl chloride
Signed
Signed on behalf of the National Assembly for Wales under section 66(1) of the Government of Wales Act 1998 .
Rhodri Morgan — First Secretary — 2001-12-07
Explanatory note
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Footnotes
[^f00001]: 1991 c. 56. Section 213 is amended by the Competition and Service (Utilities) Act 1992 (c. 43). Functions under section 67 of the Water Industry Act 1991 for making regulations concerning water supplied by water undertakers, and functions under section 69 of that Act were transferred to the National Assembly for Wales in relation to any water undertaker whose area is wholly or mainly in Wales by the National Assembly for Wales (Transfer of Functions) Order 1999 (S.I. 1999/672), Schedule 1, as substituted by S.I. 2000/253, Schedule 3. Functions under section 213 of the Water Industry Act 1991 are exercisable by the National Assembly for Wales to the same extent as the powers, duties and other provisions to which that section applies are exercisable by the Assembly; see S.I. 1999/672, Schedule 1, as substituted by S.I. 2000/253, Schedule 3.
[^f00002]: Functions under section 77(3) and (4) of the Water Industry Act 1991 are transferred to the National Assembly for Wales, so far as exercisable in relation to Wales, by S.I. 1999/672, Schedule 1, as substituted by S.I. 2000/253, Schedule 3.
[^f00003]: S.I. 1989/1147, amended by S.I. 1989/1384, 1991/1837, and 2790, 1996/3001 and 1999/1524.
[^f00004]: 1991 c. 57.
[^f00005]: 1977 c. 49. Section 8 was substituted by the Health Authorities Act 1995 (c. 17), section 1.
[^f00006]: See, as to the functions of customer services committees, section 29 of the Water Industry Act 1991.
[^f00007]: O.J. L330, 5.12.98, p.32.
[^f00008]: O.J. No. L194, 16.6.75, p.26.
[^f00009]: 1991 c. 57.
[^f00010]: S.I. 1996/3001.
[^f00011]: Regulations 23A and 23B were inserted by S.I. 1999/1524.
[^f00012]: The date on which regulation 23A of the Water Supply (Water Quality) Regulations 1989 came into force.
[^f00013]: O.J. No. L40, 11.2.89, p.12.
[^f00014]: Cmnd 2073.
[^f00015]: Cmnd 2183.
[^f00016]: O.J. No. L204, 21.7.98, p.37, amended by Council Directive 98/48/EC (O.J. No. L217, 5.8.98, p.18).
[^f00017]: As to the application of section 77(1) to the councils of counties in which there are no distinct councils see regulation 5(7) of S.I. 1994/867 as substituted by S.I. 1996/611.
[^f00018]: S.I. 1999/1524.
[^f00019]: S.I. 1989/1384.
[^f00020]: S.I. 1991/1837.
[^f00021]: S.I. 1991/2790, to which there are amendments not relevant to these Regulations.
[^f00022]: S.I. 1996/3001.
[^f00023]: 1998 c. 38.
| Item | Parameters | Concentration or Value (maximum) | Units of Measurement | Point of compliance |
|---|---|---|---|---|
| 1. | Enterococci | 0 | number/100ml | Consumers’ taps |
| 2. | Escherichia coli (E. coli) | 0 | number/100ml | Consumers’ taps |
| Item | Parameters | Concentration or Value (maximum) | Units of Measurement | Point of compliance |
| --- | --- | --- | --- | --- |
| 1. | Coliform bacteria | 0 | number/100ml | Service reservoirs* and water treatment works |
| 2. | Escherichia coli (E. coli) | 0 | number/100ml | Service reservoirs and water treatment works |
Note: *Compliance required as to 95% of samples from each service reservoir (regulation 4(6)).
| Item | Parameters | Concentration or Value (maximum) | Units of Measurement | Point of compliance |
|---|---|---|---|---|
| 1. | Acrylamide | 0.10 | ℞g/l | (i) |
| 2. | Antimony | 5.0 | ℞gSb/l | Consumers’ taps |
| 3. | Arsenic | 10 | ℞gAs/l | Consumers’ taps |
| 4. | Benzene | 1.0 | ℞g/l | Consumers’ taps |
| 5. | Benzo(a)pyrene | 0.010 | ℞g/l | Consumers’ taps |
| 6. | Boron | 1.0 | mgB/l | Consumers’ taps |
| 7. | Bromate | 10 | ℞gBrO₃/l | Consumers’ taps |
| 8. | Cadmium | 5.0 | ℞gCd/l | Consumers’ taps |
| 9. | Chromium | 50 | ℞gCr/l | Consumers’ taps |
| 10. | Copper(i) | 2.0 | mgCu/l | Consumers’ taps |
| 11. | Cyanide | 50 | ℞gCN/l | Consumers’ taps |
| 12. | 1, 2 dichloroethane | 3.0 | ℞g/l | Consumers’ taps |
| 13. | Epichlorohydrin | 0.10 | ℞g/l | (i) |
| 14. | Fluoride | 1.5 | mgF/l | Consumers’ taps |
| 15. | Lead(ii) | (a)25, from 25th December 2003 until immediately before 25th December 2013 | ℞gPb/l | Consumers’ taps |
| (b)10, on and after 25th December 2013 | ℞gPb/l | Consumers’ taps | ||
| 16. | Mercury | 1.0 | ℞gHg/l | Consumers’ taps |
| 17. | Nickel(ii) | 20 | ℞gNi/l | Consumers’ taps |
| 18. | Nitrate(iii) | 50 | mgNO₃/l | Consumers’ taps |
| 19. | Nitrite(iii) | 0.50 | mgNO₂/l | Consumers’ taps |
| 0.10 | Treatment Works | |||
| 20. | Pesticides(iv)(v)Aldrin )Dieldrin )Heptachlor )Heptachlor )epoxide ) | 0.030 | ℞g/l | Consumers’ taps |
| other pesticides | 0.10 | ℞g/l | Consumers’ taps | |
| 21. | Pesticides: Total(vi) | 0.50 | ℞g/l | Consumers’ taps |
| 22. | Polycyclic aromatic hydrocarbons(vii) | 0.10 | ℞g/l | Consumers’ taps |
| 23. | Selenium | 10 | ℞gSe/l | Consumers’ taps |
| 24. | Tetrachloroethene and Trichloroethene(viii) | 10 | ℞g/l | Consumers’ taps |
| 25. | Trihalomethanes: Total(ix) | 100 | ℞g/l | Consumers’ taps |
| 26. | Vinyl chloride | 0.50 | ℞g/l | (i) |
Notes:
- (i) The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification.
- (ii) See also regulation 6(6).
- (iii) See also regulation 4(2)(d).
- (iv) See the definition of “pesticides and related products” in regulation 2.
- (v) The parametric value applies to each individual pesticide.
- (vi) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.
- (vii) The specified compounds are:
-
- benzo(b)fluoranthene
-
- benzo(k)fluoranthene
-
- benzo(ghi)perylene
-
- indeno(1,2,3-cd)pyrene.
- The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.The specified compounds are:- chloroform- bromoform- dibromochloromethane- bromodichloromethane.
- The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.Part II:National requirementsItemParametersConcentration or Value (maximum unless otherwise stated)Units of MeasurementPoint of compliance1.Aluminium200℞gAl/lConsumers’ taps2.Colour20mg/l Pt/CoConsumers’ taps. . .. . .. . .. . .. . .. . .. . .. . .4.Iron200℞gFe/lConsumers’ taps5.Manganese50℞gMn/lConsumers’ taps6.Odour Acceptable to consumers and no abnormal change . . .Consumers’ taps7.Sodium200mgNa/lConsumers’ taps8.TasteAcceptable to consumers and no abnormal change. . .Consumers’ taps9.Tetrachlorome-thane3℞g/lConsumers’ taps10.Turbidity4NTUConsumers’ taps
| Item | Parameters | Specification Concentration or Value (maximum unless otherwise stated) or State | Units of Measurement | Point of monitoring |
|---|---|---|---|---|
| 1. | Ammonium | 0.50 | mgNH₄/l | Consumers’ taps |
| 2. | Chloride(i) | 250 | mgCl/l | Supply point* |
| 3. | Clostridium perfringens (including spores) | 0 | Number/100ml | Supply point* |
| 4. | Coliform bacteria | 0 | Number/100ml | Consumers’ taps |
| 5. | Colony counts | No abnormal change | Number/1ml at 22°C | Consumers’ taps, service |
| Number/1ml at 37°C | Reservoirs and treatment works | |||
| 6. | Conductivity(i) | 2500 | ℞S/cm at 20°C | Supply point* |
| 7. | Hydrogen ion | 9.5 | pHvalue | Consumers’ taps |
| 6.5 (minimum) | pH value | |||
| 8. | Sulphate(i) | 250 | mgSO₄ /l | Supply point* |
| 9. | Total indicative dose (for radioactivity)(ii) | 0.10 | mSv/year | Supply point* |
| 10. | Total organic carbon (TOC) | No abnormal change | mgC/l | Supply point* |
| 11. | Tritium (for radioactivity) | 100 | Bq/l | Supply point* |
| 12. | Turbidity | 1 | NTU | Treatment works |
Notes:
- (i) The water should not be aggressive.
- (ii) Excluding tritium, potassium-40, radon and radon decay products.
*May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.
| (1) | (2) | (3) |
|---|---|---|
| Item | Parameter | Circumstances |
| 1. | Aluminium | When used as flocculant or where the water originates from, or is influenced by, surface waters |
| 2. | Ammonium | |
| 3. | Clostridium perfringens (including spores) | Where the water originates from, or is influenced by, surface waters |
| 4. | Coliform bacteria | |
| 5. | Colony counts | |
| 6. | Colour | |
| 7. | Conductivity | |
| 8. | Escherichia coli (E. coli) | |
| 9. | Hydrogen ion | |
| 10. | Iron | When used as flocculant or where the water originates from, or is influenced by, surface waters |
| 11. | Manganese | Where the water originates from, or is influenced by, surface waters |
| 12. | Nitrate | When chloramination is practised |
| 13. | Nitrite | When chloramination is practised |
| 14. | Odour | |
| 15. | Taste | |
| 16. | Turbidity | |
| (1) | (2) | (3) |
| --- | --- | --- |
| Substances and parameters subject to check monitoring | Estimated population of water supply zone | Reduced |
| E. coli | ||
| Coliform bacteria | <100 | |
| Residual disinfectant | .100 | |
| Aluminium | ||
| Ammonium | ||
| Clostridium perfringens (including spores)* | <100 | 1 |
| 100—4,999 | 2 | |
| 5,000—9,999 | 6 | |
| Colony counts | 10,000—29,999 | 12 |
| Colour | 30,000—49,999 | 18 |
| Conductivity* | 50,000—79,999 | 26 |
| Hydrogen ion | 80,000—100,000 | 38 |
| Iron | ||
| Manganese | ||
| Nitrate(ii) | ||
| Nitrite(ii) | ||
| Odour | ||
| Taste | ||
| Turbidity | ||
| Parameters subject to audit monitoring | ||
| Aluminium | ||
| Antimony | ||
| Arsenic | ||
| Benzene* | <100 | |
| Benzo(a)pyrene | 100—4,999 | |
| Boron* | 5,000—100,000 | |
| Bromate(iii) | ||
| Cadmium | ||
| Chromium | ||
| Clostridium perfringens (including spores) | ||
| Copper | ||
| Cyanide* | ||
| 1,2 dichloroethane* | ||
| Enterococci | ||
| Fluoride* | ||
| Iron | ||
| Lead | ||
| Manganese | ||
| Mercury* | ||
| Nickel | ||
| Nitrate(ii) | ||
| Nitrite(ii) | ||
| Pesticides and related products* | ||
| Polycyclic aromatic | <100 | |
| hydrocarbons | 100—4,999 | |
| Selenium | 5,000—100,000 | |
| Sodium | ||
| Trichloroethene | ||
| /Tetrachloroethene* | ||
| Tetrachloromethane* | ||
| Trihalomethanes | ||
| Chloride* | ||
| Sulphate* | ||
| Total organic carbon* | ||
| Tritium* | ||
| Gross alpha*(iv) | ||
| Gross beta*(iv) |
Notes: * Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and (iii) below.
- (i) Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000.
- (ii) Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required.
- (iii) Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points.
- (iv) To monitor for total indicative dose (for radioactivity).
| (1) | (2) | (3) | (4) | (5) |
|---|---|---|---|---|
| Item | Substances and parameters | Volume of water supplied m³/d | Reduced | Standard |
| 1. | E. Coli | <20 | 4 | |
| 2. | Coliform bacteria | 20—1,999 | 12 | 52 |
| 3. | Colony counts | 2,000—5,999 | 52 | 104 |
| 4. | Nitrite(ii) | 6,000—11,999 | 104 | 208 |
| 5. | Residual disinfectant | .12,000 | 104 | 365 |
| 6. | Turbidity | |||
| Subject to check monitoring | Subject to check monitoring | |||
| 7. | Clostridium perfringens(i) | <20 | 2 | |
| 20 — 999 | 2 | 4 | ||
| 8. | Conductivity | 1,000 — 1,999 | 6 | 12 |
| 2,000 — 5,999 | 12 | 24 | ||
| 6,000 — 9,999 | 18 | 36 | ||
| 10,000 — 15,999 | 26 | 52 | ||
| 16,000 — 32,999 | 52 | 104 | ||
| 33,000 — 49,999 | 78 | 156 | ||
| 50,000 — 67,999 | 104 | 208 | ||
| 68,000 — 84,999 | 130 | 260 | ||
| 85,000 — 101,999 | 156 | 312 | ||
| 102,000 —119,999 | 183 | 365 | ||
| 120,000 — 241,999 | 365 | 730 | ||
| 242,000 — 484,999 | 730 | 1,460 | ||
| 485,000 — 728,999 | 1,095 | 2,190 | ||
| Subject to audit monitoring | Subject to audit monitoring | |||
| 9. | Benzene | |||
| 10. | Boron | |||
| 11. | Bromate(iv) | |||
| 11A | Clostridium perfringens (including spores) | |||
| 12. | Cyanide | |||
| 13. | 1,2 dichloroethane | |||
| 14. | Fluoride | |||
| 15. | Mercury | <20 | 1 | |
| 16. | Nitrite(iii) | 20—999 | 4 | |
| 17. | Pesticides and Related products | 1,000—49,999 | 8 | |
| 50,000—89,999 | 12 | |||
| 90,000—299,999 | 24 | |||
| 300,000—649,000 | 36 | |||
| 18. | Trichloroethene )Tetrachloroethene) | .650,000 | 48 | |
| 19. | Tetrachloromethane | |||
| 20. | Chloride | |||
| 21. | Sulphate | |||
| 22. | Total organic carbon | |||
| 23. | Tritium | |||
| 24. | Gross alpha(v) | |||
| 25. | Gross beta(v) |
Notes: *Sampling is at treatment works for the substances and parameters shown in column (1) of the Table as items 1 to 6 and at supply points for the other substances and parameters, except nitrite, subject to notes (ii) and (iii) below.
- (i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3).
- (ii) Sampling at treatment works when chloramination is practised.
- (iii) Sampling at treatment works when chloramination is not practised.
- (iv) Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones.
- (v) To monitor for total indicative dose (for radioactivity).
| (1) | (2) |
|---|---|
| Parameter | Method |
| Clostridium perfringens (including spores) | Membrane filtration followed by anaerobic incubation of the membrane on m-CP agar* at 44+ 1°C for 21+ 3 hours. Count opaque yellow colonies that turn pink or red after exposure to ammonium hydroxide vapours for 20 to 30 seconds. |
| Coliform bacteria | ISO 9308-1 |
| Colony count 22°C — enumeration of culturable microorganisms | prEN ISO 6222 |
| Colony count 37°C— enumeration of culturable microorganisms | prEN ISO 6222 |
| Enterococci | ISO 7899-2 |
| Escherichia coli (E. coli) | ISO 9308-1 |
*The composition of m-CP agar is:
| Basal medium | |
|---|---|
| Tryptose | 30.0g |
| Yeast extract | 20.0g |
| Sucrose | 5.0g |
| L-cysteine hydrochloride | 1.0g |
| MgSO₄·7H₂O | 0.1g |
| Bromocresol purple | 40.0mg |
| Agar | 15.0g |
| Water | 1,000.0ml |
Dissolve the ingredients of the basal medium, adjust pH to 7.6 and autoclave at 121°C for15 minutes. Allow the medium to cool and add:
| D-cycloserine | 400.0mg |
|---|---|
| Polymyxine-B sulphate | 25.0mg |
| Indoxyl-[beta]-D-glucoside | 60.0mg |
| to be dissolved in 8ml sterile water before addition | |
| Filter — sterilised 0.5% phenolphthalein diphosphate solution | 20.0ml |
| Filter — sterilised 4.5% FeCl₃· 6H₂O | 2.0ml |
| (1) | (2) |
| --- | --- |
| Parameters | Trueness % of prescribed concentration or value or specification |
| Aluminium | 10 |
| Ammonium | 10 |
| Antimony | 25 |
| Arsenic | 10 |
| Benzene | 25 |
| Benzo(a)pyrene | 25 |
| Boron | 10 |
| Bromate | 25 |
| Cadmium | 10 |
| Chloride | 10 |
| Chromium | 10 |
| Colour | 10 |
| Conductivity | 10 |
| Copper | 10 |
| Cyanide(i) | 10 |
| 1,2-dichloroethane | 25 |
| Fluoride | 10 |
| Iron | 10 |
| Lead | 10 |
| Manganese | 10 |
| Mercury | 20 |
| Nickel | 10 |
| Nitrate | 10 |
| Nitrite | 10 |
| Pesticides and related products(ii) | 25 |
| Polycyclic aromatic hydrocarbons(iii) | 25 |
| Selenium | 10 |
| Sodium | 10 |
| Sulphate | 10 |
| Tetrachloromethane | 20 |
| Trichloroethene(iv) | 25 |
| Trihalomethanes: Total(iii) | 25 |
| Turbidity(v) | 10 |
| Turbidity(vi) | 25 |
Notes:
- (i) The method of analysis should determine total cyanide in all forms.
- (ii) The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned.
- (iii) The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1.
- (iv) The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1.
- (v) The performance characteristics apply to the prescribed value of 4NTU.
- (vi) The performance characteristics apply to the specification of 1NTU for water leaving treatment works.
The amendments to the 1989 Regulations referred to in regulation 40 are—
- (a) after regulation 13, the insertion of the following regulation—
(13A) (1) Subject to paragraphs (5) and (6), in each of the years 2002 and 2003, a water undertaker shall take, or cause to be taken, from its sampling points or, as the case may be, its supply points, for analysis for testing against the concentrations and values specified in column (2) of Table 4A for the organisms and substances listed in column (1) of that Table, not less than the number of samples specified in paragraphs (2) and (3). (2) In respect of supply points and the supply of a volume of water within a range shown in column (3) of that Table, the number is that shown in column (4) of that Table with the prefix “S” as applicable to a volume within that range. (3) In respect of sampling points and the supply of water to an estimated population within a range shown in column (5) of that Table, the number is that shown in column (6) of that Table with the prefix “S” as applicable to a population within that range. (4) In each of those years samples shall be taken at regular intervals throughout the year. (5) Where— (a) a programme of work has been approved or is treated as approved under regulation 41 (transitional provision: programmes of work) of the Water Supply (Water Quality) Regulations 2001; or has otherwise been agreed by the National Assembly for Wales; and (b) at least one of the steps required to be taken in accordance with that programme— (i) relates to an organism or substance listed in column (1) of Table 4A; and (ii) remains to be completed, the number of samples to be taken in any period of twelve months beginning with the date on which the programe was approved, treated as approved, or agreed (as the case may be) and ending on the day on which the last of those steps is completed, for analysis for testing for that organism or substance, may be the number shown in column (4) or, as the case may be, column (6) of that Table with the prefix “R”. (6) Where analysis of the samples taken by a water undertaker in 2002 in accordance with this regulation has established a concentration or value in respect of an organism or substance listed in column (1) of Table 4A that is significantly lower than the prescribed concentration or value, the number of samples to be taken in 2003, for analysis for testing for that organism or substance, may be the number shown in column (4) or, as the case may be, column (6) of that Table with the prefix “R”.
- (b) after regulation 20, the insertion of the following regulation—
(20A) The samples taken in accordance with regulation 13 shall additionally be tested against the concentrations and values specified in column (2) of Table 4B.
- (c) in regulation 21 (collection and analysis of samples)—
- (i) in paragraph (2), the insertion, after “means”, of “subject to paragraph (3)”; and
- (ii) the addition, at the end, of the following—
(3) In relation to each of the parameters and other substances listed in column (1) of Table 4B, paragraph (2)(d) shall have effect as if for sub-paragraph (iii) there were substituted the requirements of regulation 21A.
- (d) after regulation 21, the insertion of the following regulation—
(21A) (1) The method of analysis used for testing for a parameter or other substance listed in column (1) of Table 4B against the concentrations in column (2) of that Table must be capable, at the time of use— (a) of measuring concentrations with the trueness and precision specified in relation to that parameter or substance in columns (3) and (4) of Table 4B; and (b) of detecting the parameter or substance at the limit of detection specified in relation to it in column (5) of that Table. (2) For the purposes of paragraph (1)— - “limit of detection” is to be calculated as— 1. three times the relative within batch standard deviation of a natural sample containing a low concentration of the parameter or substance; or 2. five times the relative within batch standard deviation of a blank sample; - “precision” (the random error) is the standard deviation (within a batch and between batches) of the spread of results about the mean; and - “trueness” (the systematic error) is the difference between the mean value of a large number of repeated measurements and the true value.
- (e) in regulation 29, in paragraph (1)(f)—
- (i) after the words “Part IV of these Regulations”, the insertion of “ , other than regulation 13A, ”; and
- (ii) by the insertion, at the end, of “ or regulation 29 of the Water Supply (Water Quality) Regulations 2001 ”; and
- (f) the insertion, after Table 4 in Schedule 3, of the following Tables—
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