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The Private Water Supplies (Wales) Regulations 2017
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PART 2E+WAnalytical methods
Commencement Information
I1Sch. 4 Pt. 2 in force at 20.11.2017, see reg. 1
Table 1
Prescribed methods of analysis for microbiological parameters
| Parameter | Method |
|---|---|
| Escherichia coli (E. coli) | EN ISO 9308-1 or EN ISO 9308-2 |
| Enterococci | EN ISO 7899-2 |
| Pseudomonas aeruginosa | EN-ISO 16266 |
| Colony count 22°C — enumeration of culturable microorganisms | EN ISO 6222 |
| Colony count 36°C — enumeration of culturable microorganisms | EN ISO 6222 |
| Clostridium perfringens (including spores) | EN ISO 14189 |
Table 2
Prescribed performance characteristics for methods of analysis for chemical and indicator parameters: trueness, precision and limit of detection (on or before 31 December 2019)
| Parameter | Trueness % of prescribed concentration or value or specification (except for pH) | Precision % of prescribed concentration or value or specification (except for pH) | Limit of detection % of prescribed concentration or value or specification (except for pH) |
|---|---|---|---|
(1) The method of analysis should determine total cyanide in all forms. | |||
(2) EN ISO 8476. | |||
(3) The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned. 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. | |||
(4) The performance characteristics apply to the individual substances specified at 25% of the parametric value in Table B of Part 1 of Schedule 1. | |||
(5) The performance characteristics apply to the individual substances specified at 50% of the parametric value in Table B of Part 1of Schedule 1. | |||
(6) The performance characteristics apply to the prescribed value of 4 NTU. | |||
(7) The performance characteristics apply to the specification of 1 NTU for surface waters or ground waters influenced by surface water. | |||
| 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(1) | 10 | 10 | 10 |
| 1.2-dichloroethane | 25 | 25 | 10 |
| Fluoride | 10 | 10 | 10 |
| Hydrogen ion concentration pH (expressed in pH units) | 0.2 | 0.2 | |
| 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 |
| Oxidisability(2) | |||
| Pesticides and related products(3) | 25 | 25 | 25 |
| Polycyclic aromatic hydrocarbons(4) | 25 | 25 | 25 |
| Selenium | 10 | 10 | 10 |
| Sodium | 10 | 10 | 10 |
| Sulphate | 10 | 10 | 10 |
| Tetrachloroethene(5) | 25 | 25 | 10 |
| Tetrachloromethane | 20 | 20 | 20 |
| Trichloroethene(5) | 25 | 25 | 10 |
Trihalomethanes: Total(4) | |||
| 25 | 25 | 10 | |
| Turbidity(6) | 10 | 10 | 10 |
| Turbidity(7) | 25 | 25 | 25 |
Table 3
Method of analysis for chemical and indicator parameters: uncertainty of measurement(1)
| Parameter | Uncertainty of measurement % of parametric value (except for pH) |
|---|---|
(1) The uncertainty of measurement must not be used as an additional tolerance to the parametric values set out in Schedule 1. | |
(2) If the value of uncertainty of measurement cannot be met, the best available technique should be selected (up to 60%). | |
(3) The method of analysis should determine total cyanide in all forms. | |
(4) EN ISO 8476. | |
(5) The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned. 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. | |
(6) The performance characteristics apply to the individual substances specified at 25% of the parametric value in Table B of Part 1 of Schedule 1. | |
(7) The performance characteristics apply to the individual substances specified at 50% of the parametric value in Table B of Part 1 of Schedule 1. | |
(8) The uncertainty of measurement must be estimated at the level of 3mg/l of TOC. CEN 1484 Guidelines for the determination of TOC and dissolved organic carbon must be used. | |
(9) The uncertainty of measurement must be estimated at the level of 1,0 NTU in accordance with EN ISO 7027. | |
| Aluminium | 25 |
| Ammonium | 40 |
| Antimony | 40 |
| Arsenic | 30 |
| Benzene | 40 |
| Benzo(a)pyrene(2) | 50 |
| Boron | 25 |
| Bromate | 40 |
| Cadmium | 25 |
| Chloride | 15 |
| Chromium | 30 |
| Conductivity | 20 |
| Copper | 25 |
| Cyanide(3) | 30 |
| 1,2-dichloroethane | 40 |
| Fluoride | 20 |
| Hydrogen ion concentration pH (expressed in pH units) | 0.2 |
| Iron | 30 |
| Lead | 25 |
| Manganese | 30 |
| Mercury | 30 |
| Nickel | 25 |
| Nitrate | 15 |
| Nitrite | 20 |
| Oxiedisability(4) | 50 |
| Pesticides(5) | 30 |
| Polycyclic aromatic hydrocarbons(6) | 50 |
| Selenium | 40 |
| Sodium | 15 |
| Sulphate | 15 |
| Tetrachloroethene(7) | 30 |
| Trichloroethene(7) | 40 |
| Trihalomethanes: total(6) | 40 |
| Total organic carbon (TOC)(8) | 30 |
| Turbidity(9) | 30 |
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