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The Water Supply (Water Quality) Regulations 2001 (revoked)
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Rhagor o Adnoddau
Changes over time for: SCHEDULE 4
Version Superseded: 20/04/2010
Alternative versions:
- 01/01/2004- Amendment
- 01/01/2004
Point in time - 20/04/2010- Amendment
Status:
Point in time view as at 01/01/2004.
Changes to legislation:
There are currently no known outstanding effects for the The Water Supply (Water Quality) Regulations 2001 (revoked), SCHEDULE 4.
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regulation 16
SCHEDULE 4E+W ANALYTICAL METHODOLOGY
TABLE A1 E+WPARAMETERS 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 E+WPARAMETERS 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 |
| 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(i) | 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(ii) | 25 | 25 | 25 |
| Polycyclic aromatic hydrocarbons(iii) | 25 | 25 | 25 |
| Selenium | 10 | 10 | 10 |
| Sodium | 10 | 10 | 10 |
| Sulphate | 10 | 10 | 10 |
| Tetrachloromethane | 20 | 20 | 20 |
| Trichloroethene(iv) | 25 | 25 | 10 |
| Trihalomethanes: Total(iii) | 25 | 25 | 10 |
| Turbidity(v) | 10 | 10 | 10 |
| Turbidity(vi) | 25 | 25 | 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.
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