LegalizeThe Water Supply (Water Quality) (Scotland) Regulations 2001
Made: 4th June 2001
Laid before the Scottish Parliament: 5th June 2001
Coming into force in accordance with regulation 1(2) to (4)
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PART I — GENERAL
Citation, commencement and extent
1
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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
5
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Monitoring: general provisions
6
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Determination of 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
11
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Sampling for particular substances and parameters
12
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Sampling at treatment works
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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: Schedule 2 indicator parameters
18
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Action by the Scottish Ministers
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
Treatment of raw water
25
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Contamination from pipes
26
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Application and introduction of substances and products
27
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Use of processes
28
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Offences
29
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PART VIII — RECORDS AND INFORMATION
Maintenance of records
30
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Provision of information
31
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Publication of information
32
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PART IX — FUNCTIONS OF LOCAL AUTHORITIES IN RELATION TO WATER QUALITY
Application and interpretation
33
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Duties of local authorities: supplementary provision
34
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PART X — ENFORCEMENT
Contraventions by water authorities
35
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PART XI — AMENDMENT AND REVOCATION OF REGULATIONS AND SAVING AND TRANSITIONAL PROVISION
Amendment of the Water Supply (Water Quality) (Scotland) Regulations 1990
36
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Transitional provision: programmes of work
37
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Transitional provision: authorisations
38
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Revocation of Regulations and savings
39
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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) “PAH” means Polycyclic Aromatic Hydrocarbons, 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) “PAH” means Polycyclic Aromatic Hydrocarbons, 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) “PAH” means Polycyclic Aromatic Hydrocarbons, 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) “PAH” means Polycyclic Aromatic Hydrocarbons, 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) “PAH” means Polycyclic Aromatic Hydrocarbons, 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) “THM: Total” means total Trihalomethanes, 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) “THM: Total” means total Trihalomethanes, 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) “THM: Total” means total Trihalomethanes, 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) “THM: Total” means total Trihalomethanes, 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) “THM: Total” means total Trihalomethanes, 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 | mg Cu/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 | mg F/l | consumers' taps |
| 15. | Lead[^f01002] | (a) 25, from 25/12/03 until 24/12/13 | μgPb/l | consumers' taps |
| (b) 10, from 25/12/13 | 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 | mgNO₂/l | treatment works | ||
| 20. | Pesticides[^f01004][^f01005]– | |||
| Aldrin | 0.030 | μg/l | consumers' taps | |
| Dieldrin | 0.030 | μg/l | consumers' taps | |
| Heptachlor | 0.030 | μg/l | consumers' taps | |
| 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. | PAH[^f01007] | 0.10 | μg/l | consumers' taps |
| 23. | Selenium | 10 | μgSe/l | consumers' taps |
| 24. | Tetrachloroethene & Trichloroethene[^f01008] | 10 | μg/l | consumers' taps |
| 25. | THM: 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 | μg Al/l | consumers' taps |
| 2. | Colour | 20 | mg/l Pt/Co | consumers' taps |
| 3. | Hydrogen ion | 9.5 | pH value | consumers' taps |
| 6.5 (minimum) | ||||
| 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. | Tetrachloromethane | 3 | μg/l | consumers' taps |
| 10. | Turbidity | 4 | NTU | consumers' taps |
SCHEDULE 2 — INDICATOR PARAMETERS
| Item | Parameters | 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/100 ml | supply point[^f01012] |
| 4. | Coliform bacteria | 0 | Number/100ml | consumers' taps |
| 5. | Colony count | No abnormal change | Number/1 ml at 22°C | consumers' taps |
| Number/1 ml at 37°C | service reservoirs and treatment works | |||
| 6. | Conductivity[^f01010] | 2500 | μS/cm at 20°C | supply point[^f01012] |
| 7. | Sulphate[^f01010] | 250 | mgSO4/l | supply point[^f01012] |
| 8. | Total indicative dose (for radioactivity)[^f01011] | 0.10 | mSv/year | supply point[^f01012] |
| 9. | Total organic carbon (TOC) | No abnormal change | mgC/l | supply point[^f01012] |
| 10. | Tritium (for radioactivity) | 100 | Bq/l | supply point[^f01012] |
| 11. | 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: |
| + See regulation 6(2) and Table 1 in Schedule 3. | + See regulation 6(2) and Table 1 in Schedule 3. | + See regulation 6(2) and Table 1 in Schedule 3. | + See regulation 6(2) and Table 1 in Schedule 3. |
| * 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 5000, the population figure should be rounded up to the nearest multiple of 5000. | (i) Where the population is not an exact multiple of 5000, the population figure should be rounded up to the nearest multiple of 5000. | (i) Where the population is not an exact multiple of 5000, the population figure should be rounded up to the nearest multiple of 5000. | (i) Where the population is not an exact multiple of 5000, the population figure should be rounded up to the nearest multiple of 5000. |
| (ii) 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. | (ii) 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. | (ii) 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. | (ii) 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) To monitor for total indicative dose (for radioactivity). | (iii) To monitor for total indicative dose (for radioactivity). | (iii) To monitor for total indicative dose (for radioactivity). | (iii) To monitor for total indicative dose (for radioactivity). |
| E.Coli | <100 | 4 | |
| Coliform bacteria Residual disinfectant | ≥100 | 12 per 5000 population[^f01015] | |
| Aluminium[^f01014] | |||
| Ammonium | |||
| Clostridium perfringes (including spores)[^f01014][^f01015] | |||
| Colony counts | <100 | 1 | 2 |
| Colour | 100 – 4,999 | 2 | 4 |
| Conductivity[^f01014] | 5,000 – 9,999 | 6 | 12 |
| Hydrogen ion | 10,000 – 29,999 | 12 | 24 |
| Iron[^f01013] | 30,000 – 49,999 | 18 | 36 |
| Manganese[^f01013] | 50,000 – 79,999 | 26 | 52 |
| Nitrate[^f01013] | 80,000 – 100,000 | 38 | 76 |
| Nitrite[^f01013] | |||
| Odour | |||
| Taste | |||
| Turbidity | |||
| Parameters subject to audit monitoring | |||
| Antimony | |||
| Arsenic | |||
| Benzene[^f01014] | |||
| Benzo(a)pyrene | |||
| Boron[^f01014] | |||
| Bromate[^f01016][^f01014] | |||
| Cadmium | |||
| Chromium | <100 | 1 | |
| Copper | 100 – 4,999 | 4 | |
| Cyanide[^f01014] | 5,000 – 100,000 | 8 | |
| 1, 2 dichloroethane[^f01014] | |||
| Enterococci | |||
| Flouride[^f01014] | |||
| Lead | |||
| Mercury[^f01014] | |||
| Nickel | |||
| Pesticides[^f01014] | |||
| PAH | |||
| Selenium | |||
| Sodium | |||
| Trichloroethene/Tetrachloroethene[^f01014] | |||
| Tetrachloromethane[^f01014] | <100 | 1 | |
| THM | 100 – 4,999 | 4 | |
| Chloride[^f01014] | 5,000 – 100,000 | 8 | |
| Sulphate[^f01014] | |||
| Total Organic Carbon[^f01014] | |||
| Tritium[^f01014] | |||
| Gross alpha[^f01017][^f01014] | |||
| Gross beta[^f01017][^f01014] |
TABLE 3 — ANNUAL SAMPLING FREQUENCIES: SUPPLY POINTS
| (1) | (2) | (3) | (4) | (5) |
|---|---|---|---|---|
| Item | Substances and parameters subject to check monitoring | Volume of water supplied m3/d | Reduced | Standard |
| Notes: | Notes: | Notes: | Notes: | Notes: |
| (i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3), otherwise audit monitoring. | (i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3), otherwise audit monitoring. | (i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3), otherwise audit monitoring. | (i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3), otherwise audit monitoring. | (i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3), otherwise audit monitoring. |
| (ii) Audit monitoring at supply points is permitted 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. | (ii) Audit monitoring at supply points is permitted 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. | (ii) Audit monitoring at supply points is permitted 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. | (ii) Audit monitoring at supply points is permitted 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. | (ii) Audit monitoring at supply points is permitted 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. |
| (iii) To monitor for total indicative dose (for radioactivity). | (iii) To monitor for total indicative dose (for radioactivity). | (iii) To monitor for total indicative dose (for radioactivity). | (iii) To monitor for total indicative dose (for radioactivity). | (iii) To monitor for total indicative dose (for radioactivity). |
| 1. | Clostridium perfringens (including spores)[^f01018] | <20 | 2 | |
| 20 – 999 | 2 | 4 | ||
| 2. | 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 | ||
| Parameters subject to audit monitoring | ||||
| 3. | Benzene | |||
| 4. | Boron | |||
| 5. | Bromate[^f01019] | |||
| 6. | Cyanide | |||
| 7. | 1,2 dichloroethane | |||
| 8. | Fluoride | <20 | 1 | |
| 9. | Mercury | 20 – 999 | 4 | |
| 10. | Pesticides | 1,000 – 49,999 | 8 | |
| 11. | Trichloroethene/Tetrachloroethene | 50,000 – 89,999 | 12 | |
| 90,000 – 299,999 | 24 | |||
| 12. | Tetrachloromethane | 300,000 – 649,999 | 36 | |
| 13. | Chloride | ≥650,000 | 48 | |
| 14. | Sulphate | |||
| 15. | Total organic carbon | |||
| 16. | Tritium | |||
| 17. | Gross alpha[^f01020] | |||
| 18. | Gross beta[^f01020] |
TABLE 4 — ANNUAL SAMPLING FREQUENCIES: WATER TREATMENT WORKS
| (1) | (2) | (3) | (4) | (5) |
|---|---|---|---|---|
| Item | Substances and parameters subject to check monitoring | Volume of water supplied m3/d | Reduced | Standard |
| Notes: | Notes: | Notes: | Notes: | Notes: |
| (i) check monitoring at treatment works is required only when chloramination is practised. In other circumstances, audit monitoring is required. | (i) check monitoring at treatment works is required only when chloramination is practised. In other circumstances, audit monitoring is required. | (i) check monitoring at treatment works is required only when chloramination is practised. In other circumstances, audit monitoring is required. | (i) check monitoring at treatment works is required only when chloramination is practised. In other circumstances, audit monitoring is required. | (i) check monitoring at treatment works is required only when chloramination is practised. In other circumstances, audit monitoring is required. |
| 1. | E. coli | <20 | 4 | |
| 2. | Coliform bacteria | 20 – 1,999 | 12 | 52 |
| 3. | Colony counts | 2,000 – 5,999 | 52 | 104 |
| 4. | Residual disinfectant | 6,000 – 11,999 | 104 | 208 |
| ≥12,000 | 104 | 365 | ||
| 5. | Nitrite[^f01021] | <20 | 2 | |
| 6. | Turbidity | 20 – 999 | 2 | 4 |
| 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 | ||
| Substances and parameters subject to audit monitoring | ||||
| 7. | Nitrite[^f01021] | <20 | 1 | |
| 20 – 999 | 4 | |||
| 1,000 – 49,999 | 8 | |||
| 50,000 – 89,999 | 12 | |||
| 90,000 – 299,999 | 24 | |||
| 300,000 – 649,999 | 36 | |||
| >650,000 | 48 |
SCHEDULE 4 — ANALYTICAL METHODOLOGY
TABLE A1 — Parameters for which, subject to regulation 16(5), methods of analysis are prescribed
| (1) | (2) |
|---|---|
| Parameter | Method |
| The composition of m-CP agar is: Basal medium Tryptose30.0gYeast extract20.0gSucrose5.0gL–cysteine hydrichloride1.0gMgSO₄ • 7H₂O0.1gBromocresol purple40.0mgAgar15.0gWater1,000.0ml Dissolve the ingredients of the basal medium, adjust pH to 7.6 and autoclave at 121°C for 15 minutes. Allow the medium to cool and add: D-cycloserine400.0mgPolymyxine-B sulphate25.0mgIndoxyl-•-D-glucoside to be dissolved in 8ml sterile water before addition60.0mgFilter – sterilised 0.5% phenolphthalein disphosphate solution20.0mlFilter – sterilised 4.5% FeC1₃ • 6H₂O2.0ml | The composition of m-CP agar is: Basal medium Tryptose30.0gYeast extract20.0gSucrose5.0gL–cysteine hydrichloride1.0gMgSO₄ • 7H₂O0.1gBromocresol purple40.0mgAgar15.0gWater1,000.0ml Dissolve the ingredients of the basal medium, adjust pH to 7.6 and autoclave at 121°C for 15 minutes. Allow the medium to cool and add: D-cycloserine400.0mgPolymyxine-B sulphate25.0mgIndoxyl-•-D-glucoside to be dissolved in 8ml sterile water before addition60.0mgFilter – sterilised 0.5% phenolphthalein disphosphate solution20.0mlFilter – sterilised 4.5% FeC1₃ • 6H₂O2.0ml |
| Tryptose | 30.0g |
| Yeast extract | 20.0g |
| Sucrose | 5.0g |
| L–cysteine hydrichloride | 1.0g |
| MgSO₄ • 7H₂O | 0.1g |
| Bromocresol purple | 40.0mg |
| Agar | 15.0g |
| Water | 1,000.0ml |
| D-cycloserine | 400.0mg |
| Polymyxine-B sulphate | 25.0mg |
| Indoxyl-•-D-glucoside to be dissolved in 8ml sterile water before addition | 60.0mg |
| Filter – sterilised 0.5% phenolphthalein disphosphate solution | 20.0ml |
| Filter – sterilised 4.5% FeC1₃ • 6H₂O | 2.0ml |
| Clostridium perfringens (including spores) | Membrane filtration followed by anaerobic incubation of the membrane on m–CP agar[^f01022] 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 | pr EN 6222 |
| Enterocci | ISO 7899–2 |
| Escherichia coli (E. coli) | ISO 9308–1 |
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[^f01023] | 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[^f01024] | 25 | 25 | 25 |
| Polycyclic aromatic hydrocarbons[^f01025] | 25 | 25 | 25 |
| Selenium | 10 | 10 | 10 |
| Sodium | 10 | 10 | 10 |
| Sulphate | 10 | 10 | 10 |
| Tetrachloroethene[^f01026] | 25 | 25 | 10 |
| Tetrachloromethane | 20 | 20 | 20 |
| Trichloroethene[^f01026] | 25 | 25 | 10 |
| Trihalomethanes: Total[^f01025] | 25 | 25 | 10 |
| Turbidity[^f01027] | 10 | 10 | 10 |
| Turbidity[^f01028] | 25 | 25 | 25 |
SCHEDULE 5 — AMENDMENT OF THE WATER SUPPLY (WATER QUALITY) (SCOTLAND) REGULATIONS 1990
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SCHEDULE 6 — PROGRAMMES OF WORK
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Signed
RHONA BRANKIN — Authorised to sign by the Scottish Ministers — 4th June 2001
Explanatory note
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Footnotes
[^f00001]: 1980 c. 45. Sections 76B, 76F and 76J were inserted by the Water Act 1989 (c. 15), Schedule 22. Section 101(1A) was inserted by the Natural Heritage (Scotland) Act 1991 (c. 28), Schedule 10, paragraph 9(5). The functions of the Secretary of State were transferred to the Scottish Ministers by virtue of section 53 of the Scotland Act 1998 (c. 46).
[^f00002]: 1972 c. 68. Section 2(2) was amended by the Scotland Act 1998 (c. 46), Schedule 8, paragraph 15(3). The functions conferred on the Minister of the Crown under section 2(2) of the European Communities Act 1972, insofar as within devolved competence, were transferred to the Scottish Ministers by virtue of section 53 of the Scotland Act 1998.
[^f00003]: S.I. 1990/119, amended by S.I. 1991/1333.
[^f00004]: 1974 c. 40.
[^f00005]: 1978 c. 29.
[^f00006]: 1994 c. 39.
[^f00007]: O.J. No. L 330, 5.12.98, p.32.
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Editorial notes
[^key-530409cbd468e210f07a24beb08b5660]: Regulations revoked (1.1.2015) by The Public Water Supplies (Scotland) Regulations 2014 (S.S.I. 2014/364), regs. 1(1), 50(1)(b) (with reg. 1(3)(4)) [Editorial note: No historical revised versions have been created for amendments to this S.S.I. made prior to its final revocation. A revised version of how the S.S.I. stood at its first commencement is available and, to see the document content as it originally stood when it was made, select the ‘Original (As Made)’ version. For further details of the amendments see the List of All Changes available in ‘More Resources’]
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