LegalizeThe Public Water Supplies (Scotland) Regulations 2014
- (b) for enterococci, European standard EN ISO 7899-2:2000 entitled “Water quality - Detection and enumeration of intestinal enterococci - Part 2: Membrane filtration method (ISO 7899-2:2000)”;
- (c) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
- (d) for colony count 22 °C (the enumeration of culturable microorganisms — colony count after aerobic incubation at 22 °C), European standard EN ISO 6222:1999 entitled “Water quality - Enumeration of culturable micro-organisms - Colony count by inoculation in a nutrient agar culture medium (ISO 6222:1999)”;
- (e) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
- (f) for Clostridium perfringens including spores, European standard EN ISO 14189:2016 entitled “Water quality - Enumeration of Clostridium perfringens - Method using membrane filtration (ISO 14189:2013)”
- (g) for somatic coliphages, European Standard EN ISO 10705-2:2000 entitled “Water quality — Detection and enumeration of bacteriophages — Part 2: Enumeration of somatic coliphages” and European Standard EN ISO 10705-3:2003 entitled “Water quality — Detection and enumeration of bacteriophages — Part 3: Validation of methods for concentration of bacteriophages from water” can be used.
PART B — Chemical and indicator parameters
1
- (1) For a parameter in Table 1, the method of analysis used must, as a minimum, be capable of measuring concentrations equal to the prescribed concentration or value for the parameter with—
- (a) a limit of quantification of 30 % or less of the prescribed concentration or value for the parameter; and
- (b) an uncertainty of measurement as specified in Table 1 for the parameter.
- (2) The result of the analysis for a parameter in Table B or Table C must be expressed using at least the same number of significant figures as the prescribed concentration or value for the parameter in the table.
2
The uncertainty of measurement specified in Table 1 for a parameter must not be used as an additional tolerance to the prescribed concentration or value for the parameter.
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
| Parameter | Uncertainty of measurement (% of prescribed concentration or value, except pH) (Note 1) | Notes |
|---|---|---|
| Notes— | Notes— | Notes— |
| Note 1: Uncertainty of measurement is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurand, based on the information used. The performance criterion for measurement uncertainty (k = 2) is the percentage of the parametric value stated in the table or any stricter value. The uncertainty of measurement must be estimated at the level of the parametric value, unless otherwise specified. | Note 1: Uncertainty of measurement is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurand, based on the information used. The performance criterion for measurement uncertainty (k = 2) is the percentage of the parametric value stated in the table or any stricter value. The uncertainty of measurement must be estimated at the level of the parametric value, unless otherwise specified. | Note 1: Uncertainty of measurement is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurand, based on the information used. The performance criterion for measurement uncertainty (k = 2) is the percentage of the parametric value stated in the table or any stricter value. The uncertainty of measurement must be estimated at the level of the parametric value, unless otherwise specified. |
| Note 2: If the value of uncertainty of measurement cannot be met, the best available technique must be selected (up to 60%). | Note 2: If the value of uncertainty of measurement cannot be met, the best available technique must be selected (up to 60%). | Note 2: If the value of uncertainty of measurement cannot be met, the best available technique must be selected (up to 60%). |
| Note 3: The method determines total cyanide in all forms. | Note 3: The method determines total cyanide in all forms. | Note 3: The method determines total cyanide in all forms. |
| Note 4: The value for the uncertainty of measurement is expressed in pH units. | Note 4: The value for the uncertainty of measurement is expressed in pH units. | Note 4: The value for the uncertainty of measurement is expressed in pH units. |
| Note 5: Reference method European standard EN ISO 8467:1995 entitled “Water quality - Determination of permanganate index (ISO 8467:1993)”. | Note 5: Reference method European standard EN ISO 8467:1995 entitled “Water quality - Determination of permanganate index (ISO 8467:1993)”. | Note 5: Reference method European standard EN ISO 8467:1995 entitled “Water quality - Determination of permanganate index (ISO 8467:1993)”. |
| Note 6: The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30 % can be achieved for several pesticides, higher values up to 80% may be allowed for a number of pesticides. | Note 6: The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30 % can be achieved for several pesticides, higher values up to 80% may be allowed for a number of pesticides. | Note 6: The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30 % can be achieved for several pesticides, higher values up to 80% may be allowed for a number of pesticides. |
| Note 7: The performance characteristics apply to individual substances, specified at 25% of the prescribed concentration or value for the corresponding parameter in Table B. | Note 7: The performance characteristics apply to individual substances, specified at 25% of the prescribed concentration or value for the corresponding parameter in Table B. | Note 7: The performance characteristics apply to individual substances, specified at 25% of the prescribed concentration or value for the corresponding parameter in Table B. |
| Note 8: The performance characteristics apply to individual substances, specified at 50% of the prescribed concentration or value for the corresponding parameter in Table B. | Note 8: The performance characteristics apply to individual substances, specified at 50% of the prescribed concentration or value for the corresponding parameter in Table B. | Note 8: The performance characteristics apply to individual substances, specified at 50% of the prescribed concentration or value for the corresponding parameter in Table B. |
| Note 9: The uncertainty of measurement must be estimated at the level of 3 mg/l of the total organic carbon in accordance with European standard EN 1484:1997 entitled “Water analysis - Guidelines for the determination of total organic carbon and dissolved organic carbon”. | Note 9: The uncertainty of measurement must be estimated at the level of 3 mg/l of the total organic carbon in accordance with European standard EN 1484:1997 entitled “Water analysis - Guidelines for the determination of total organic carbon and dissolved organic carbon”. | Note 9: The uncertainty of measurement must be estimated at the level of 3 mg/l of the total organic carbon in accordance with European standard EN 1484:1997 entitled “Water analysis - Guidelines for the determination of total organic carbon and dissolved organic carbon”. |
| Note 10: The uncertainty of measurement must be estimated at the level of 1.0 nephelometric turbidity units in accordance with European standard EN ISO 7027-1:2016 entitled “Water quality - Determination of turbidity - Part 1: Quantitative methods (ISO 7027-1:2016)” or another equivalent standard method. | Note 10: The uncertainty of measurement must be estimated at the level of 1.0 nephelometric turbidity units in accordance with European standard EN ISO 7027-1:2016 entitled “Water quality - Determination of turbidity - Part 1: Quantitative methods (ISO 7027-1:2016)” or another equivalent standard method. | Note 10: The uncertainty of measurement must be estimated at the level of 1.0 nephelometric turbidity units in accordance with European standard EN ISO 7027-1:2016 entitled “Water quality - Determination of turbidity - Part 1: Quantitative methods (ISO 7027-1:2016)” or another equivalent standard method. |
| Aluminium | 25 | |
| Ammonium | 40 | |
| Acrylamide | 30 | |
| Antimony | 40 | |
| Arsenic | 30 | |
| Benzo(a)pyrene | 50 | Note 2 |
| Benzene | 40 | |
| Bisphenol A | 50 | |
| Boron | 25 | |
| Bromate | 40 | |
| Cadmium | 25 | |
| Chloride | 15 | |
| Chlorate | 40 | |
| Chlorite | 40 | |
| Chromium | 30 | |
| Conductivity | 20 | |
| Copper | 25 | |
| Cyanide | 30 | Note 3 |
| 1,2-dichloroethane | 40 | |
| Epichlorohydrin | 30 | |
| Fluoride | 20 | |
| HAAs | 50 | |
| Hydrogen ion concentration (in pH) | 0.20 | Note 4 |
| Iron | 30 | |
| Lead | 30 | |
| Manganese | 30 | |
| Mercury | 30 | |
| Microcystin-LR | 30 | |
| Nickel | 25 | |
| Nitrate | 15 | |
| Nitrite | 20 | |
| Oxidisability | 50 | Note 5 |
| Pesticides | 30 | Note 6 |
| PFAS | 50 | |
| Polycyclic aromatic hydrocarbons | 40 | Note 7 |
| Selenium | 40 | |
| Sodium | 15 | |
| Sulphate | 15 | |
| Tetrachloroethene | 40 | Note 8 |
| Trichloroethene | 40 | Note 8 |
| Trihalomethanes – total | 40 | Note 7 |
| Total organic carbon | 30 | Note 9 |
| Turbidity | 30 | Note 10 |
| Uranium | 30 | |
| Vinyl chloride | 50 |
PART C — Indicative dose
For each parameter in Table 3, the method of analysis used must be capable of measuring activity concentrations with at least the limit of detection specified for that parameter in the second column of the table.
| Parameter | Limit of detection (in Bq/l) (Notes 1 and 2) | Notes |
|---|---|---|
| Tritium | 10 | Note 3 |
| Radon | 10 | Note 3 |
| gross alpha activity | 0.04 | Note 4 |
| gross beta activity | 0.4 | Note 4 |
| U-238 | 0.02 | |
| U-234 | 0.02 | |
| Ra-226 | 0.04 | |
| Ra-228 | 0.02 | Note 5 |
| Pb-210 | 0.02 | |
| Po-210 | 0.01 | |
| C-14 | 20 | |
| Sr-90 | 0.4 | |
| Pu-239 / Pu-240 | 0.04 | |
| Am-241 | 0.06 | |
| Co-60 | 0.5 | |
| Cs-134 | 0.5 | |
| Cs-137 | 0.5 | |
| I-131 | 0.5 | |
| Notes to Table 3 | Notes to Table 3 | Notes to Table 3 |
| Note 1: The limit of detection must be calculated in accordance with the international standard ISO 11929:2010 entitled “Determination of the characteristic limits (decision threshold, detection limit and limits of the confidence interval) for measurements of ionising radiation - Fundamentals and application”, with probabilities of errors of 1st and 2nd kind of 0.05 each. | Note 1: The limit of detection must be calculated in accordance with the international standard ISO 11929:2010 entitled “Determination of the characteristic limits (decision threshold, detection limit and limits of the confidence interval) for measurements of ionising radiation - Fundamentals and application”, with probabilities of errors of 1st and 2nd kind of 0.05 each. | Note 1: The limit of detection must be calculated in accordance with the international standard ISO 11929:2010 entitled “Determination of the characteristic limits (decision threshold, detection limit and limits of the confidence interval) for measurements of ionising radiation - Fundamentals and application”, with probabilities of errors of 1st and 2nd kind of 0.05 each. |
| Note 2: Measurement uncertainties must be calculated and reported as complete standard uncertainties, or as expanded standard uncertainties with an expansion factor of 1.96, in accordance with international standard ISO/IEC Guide 98-3:2008 entitled “Guide to the expression of uncertainty in measurement”. | Note 2: Measurement uncertainties must be calculated and reported as complete standard uncertainties, or as expanded standard uncertainties with an expansion factor of 1.96, in accordance with international standard ISO/IEC Guide 98-3:2008 entitled “Guide to the expression of uncertainty in measurement”. | Note 2: Measurement uncertainties must be calculated and reported as complete standard uncertainties, or as expanded standard uncertainties with an expansion factor of 1.96, in accordance with international standard ISO/IEC Guide 98-3:2008 entitled “Guide to the expression of uncertainty in measurement”. |
| Note 3: The limit of detection for tritium and for radon is 10% of the corresponding prescribed concentration or value for the parameter. | Note 3: The limit of detection for tritium and for radon is 10% of the corresponding prescribed concentration or value for the parameter. | Note 3: The limit of detection for tritium and for radon is 10% of the corresponding prescribed concentration or value for the parameter. |
| Note 4: The limit of detection for gross alpha activity and gross beta activities is 40% of the screening values of 0.1 Bq/l and 1.0 Bq/l respectively. | Note 4: The limit of detection for gross alpha activity and gross beta activities is 40% of the screening values of 0.1 Bq/l and 1.0 Bq/l respectively. | Note 4: The limit of detection for gross alpha activity and gross beta activities is 40% of the screening values of 0.1 Bq/l and 1.0 Bq/l respectively. |
| Note 5: This limit of detection applies only to initial screening for indicative dose for a new water source. If initial checking indicates that it is unlikely that Ra-228 exceeds 20% of the derived concentration, the limit of detection may be increased to 0.08 Bq/l for routine Ra-228 nuclide specific measurements, until a subsequent re-check is required. | Note 5: This limit of detection applies only to initial screening for indicative dose for a new water source. If initial checking indicates that it is unlikely that Ra-228 exceeds 20% of the derived concentration, the limit of detection may be increased to 0.08 Bq/l for routine Ra-228 nuclide specific measurements, until a subsequent re-check is required. | Note 5: This limit of detection applies only to initial screening for indicative dose for a new water source. If initial checking indicates that it is unlikely that Ra-228 exceeds 20% of the derived concentration, the limit of detection may be increased to 0.08 Bq/l for routine Ra-228 nuclide specific measurements, until a subsequent re-check is required. |
Sampling: water supplied by mobile tanker
13A
- (1) Where the distribution of water in any part of a water supply zone is by mobile tanker and is (or is likely to be) an intermittent short-term supply, samples of water from each mobile tanker from which water is to distributed must be taken in accordance with paragraphs (2) and (3).
- (2) Samples must—
- (a) be taken—
- (i) when the water is put into the mobile tanker, and
- (ii) immediately before the commencement of any distribution of water from that tanker, and
- (b) be analysed for compliance with residual disinfectant (item 4) in Table 4.
- (3) Unless paragraph (4) applies, a sample must be taken when the water is put into the mobile tanker and the sample must be analysed for compliance with Escherichia coli(item 2) and Coliform bacteria (item 3) in Table A.
- (4) Where water is put into the mobile tanker from the same place on at least one other occasion within a period of 24 hours from the sample taken under sub-paragraph (3), a sample is not required to be taken on the second or any subsequent occasion that water is put into that tanker within that period.
- (5) In regulation 13 and this regulation, “mobile tanker” means a container used to distribute water for human consumption purposes that has been treated and has been transported from one part of the public water supply system to another.
Sampling: new sources
Methods of analysis
Collection and analysis of samples
Directions and guidance
2A
- (1) Each monitoring programme must include an operational monitoring programme that—
- (a) takes into account any parameter, or micro-organism, parasite or substance, identified as relevant—
- (i) by virtue of regulation 5(2), or
- (ii) through a risk assessment under regulation 30,
- (b) where appropriate, includes monitoring of parameters in accordance with sub-paragraphs (2) and (3), and
- (c) confirms the effectiveness of all measures in place to control risks to human health throughout the water supply chain (from the catchment area through abstraction, treatment and storage to distribution).
- (2) Except where turbidity is caused by iron and manganese in groundwater sources, the operational monitoring programme must include monitoring of the parameter turbidity at the treatment works in accordance with the reference values and frequencies in the following table—
| Operational parameter | Reference value | Minimum frequency of sampling and analysis | Minimum frequency of sampling and analysis | Minimum frequency of sampling and analysis |
|---|---|---|---|---|
| Turbidity at the treatment works | 0.3 NTU in 95% of samples and none to exceed 1 NTU | Volume (m³) of water distributed or produced each day within a supply zone | Volume (m³) of water distributed or produced each day within a supply zone | Volume (m³) of water distributed or produced each day within a supply zone |
| Turbidity at the treatment works | 0.3 NTU in 95% of samples and none to exceed 1 NTU | > 0 | ≤ 1,000 | Weekly |
| Turbidity at the treatment works | 0.3 NTU in 95% of samples and none to exceed 1 NTU | > 1,000 | ≤ 10,000 | Daily |
| Turbidity at the treatment works | 0.3 NTU in 95% of samples and none to exceed 1 NTU | > 10,000 | Continuous |
- (3) The operational monitoring programme must include monitoring of somatic coliphages in raw water in accordance with the following table—
| Operational parameter | Reference value | Unit | Notes |
|---|---|---|---|
| Somatic coliphages | 50 (for raw water) | PFU/100ml | This parameter must be measured if the risk assessment under regulation 30 indicates that it is appropriate to do so.If it is found in raw water at concentrations > 50 PFU/100ml, it must be analysed after steps of the treatment train in order to determine log removal by the barriers in place and to assess whether the risk of a breakthrough of pathogenic viruses is sufficiently under control. |
- (4) In this paragraph—
- “NTU” means Nephelometric Turbidity Unit, and
- “PFU” means Plaque Forming Unit.
3A
The specifications are that—
- (a) the location and frequency of sampling must be determined in relation to the parameter’s origin, as well as the variability and long-term trend of its concentration, taking into account the water quality standards,
- (b) to reduce the minimum sampling frequency for a parameter under Part B of this schedule, the results obtained from samples collected at regular intervals over a period of at least 3 years from sampling points representative of the whole water supply zone must all be less than 60% of the prescribed concentration or value for the parameter,
- (c) to remove a parameter from the list of parameters to be monitored under Part B of this schedule, the results obtained from samples collected at regular intervals over a period of at least 3 years from points representative of the whole water supply zone must all be less than 30% of the prescribed concentration or value of the parameter,
- (d) the removal of a parameter from the list of parameters to be monitored under Part B of this schedule must be based on the result of the risk assessment, informed by the results of monitoring of sources of water and confirming that human health is protected from the adverse effects of any contamination of water, and
- (e) for a reduction in the minimum sampling frequency for a parameter under Part B of this schedule or removal of a parameter from the list of parameters to be monitored under that Part, the risk assessment confirms that no factor (that can be reasonably anticipated) is likely to cause deterioration of the quality of the water.
3B
Any parameter removed from the list of parameters to be monitored in Part B of this schedule under paragraph 3(b) must be monitored—
- (a) at least once every six years, and
- (b) in cases where—
- (i) a new water source is integrated into the water supply chain (from the catchment area through abstraction, treatment and storage to distribution), or
- (ii) changes made to the water supply chain are expected to have a potentially adverse effect on the quality of water.
Reading this document does not replace reading the official text published on legislation.gov.uk. Contains public sector information licensed under the Open Government Licence v3.0. We assume no responsibility for any inaccuracies arising from the conversion of the original CLML XML to this format.
This text is published under legislation.gov.uk's own terms of reuse, not a Legalize or public-domain licence.
legislation.gov.uk
Open Government Licence v3.0 (attribution required)
© Crown and database right. Derived from content available under the Open Government Licence v3.0 from legislation.gov.uk.