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The Private Water Supplies Regulations 1991
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- UK Statutory Instruments
- 1991 No. 2790
- SCHEDULE 2
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Regulation 2(1)
SCHEDULE 2PRESCRIBED CONCENTRATIONS OR VALUES
Table A
| Item | Parameters | Units of Measurement | Concentration or Value (maximum unless otherwise stated) |
|---|---|---|---|
| Note: (i) If silver is used in a water treatment process, 80 may be substituted for 10. | |||
| 1. | Colour | mg/1 Pt/Co scale | 20 |
| 2. | Turbidity (including suspended solids) | Formazin turbidity units | 4 |
| 3. | Odour (including hydrogen sulphide) | Dilution number | 3 at 25°C |
| 4. | Taste | Dilution number | 3 at 25°C |
| 5. | Temperature | °C | 25 |
| 6. | Hydrogen ion | pH value | 9.5 5.5 (minimum) |
| 7. | Sulphate | mg SO4/1 | 250 |
| 8. | Magnesium | mg Mg/1 | 50 |
| 9. | Sodium | mg Na/1 | 150 |
| 10. | Potassium | mg K/1 | 12 |
| 11. | Dry residues | mg/1 | 1500 (after drying at 180°C) |
| 12. | Nitrate | mg NO3/1 | 50 |
| 13. | Nitrite | mg NO2/1 | 0.1 |
| 14. | Ammonium (ammonia and ammonium ions) | mg NH4/1 | 0.5 |
| 15. | Kjeldahl nitrogen | mg N/1 | 1 |
| 16. | Oxidisability (permanganate value) | mg O2/1 | 5 |
| 17. | Total organic carbon | mg C/1 | No significant increase over that normally observed |
| 18. | Dissolved or emulsified hydrocarbons (after extraction with petroleum ether); mineral oils | μg/1 | 10 |
| 19. | Phenols | μg C6H5OH/1 | 0.5 |
| 20. | Surfactants | μg/1 (as lauryl sulphate) | 200 |
| 21. | Aluminium | μg Al/1 | 200 |
| 22. | Iron | μg Fe/1 | 200 |
| 23. | Manganese | μg Mn/1 | 50 |
| 24. | Copper | μg Cu/1 | 3000 |
| 25. | Zinc | μg Zn/1 | 5000 |
| 26. | Phosphorus | μg P/1 | 2200 |
| 27. | Fluoride | μg F/1 | 1500 |
| 28. | Silver | μg Ag/1 | 10(i) |
Table B
| Item | Parameters | Units of Measurement | Maximum Concentration |
|---|---|---|---|
Note: (i) The sum of the detected concentrations of individual substances. (ii) The sum of the detected concentrations of fluoranthene, benzo 3.4 fluoranthene, benzo 11.12 fluoranthene, benzo 3.4 pyrene, benzo 1.12 perylene and indeno (1,2,3-cd) pyrene. | |||
| 1. | Arsenic | μg As/1 | 50 |
| 2. | Cadmium | μg Cd/1 | 5 |
| 3. | Cyanide | μg CN/1 | 50 |
| 4. | Chromium | μg Cr/1 | 50 |
| 5. | Mercury | μg Hg/1 | 1 |
| 6. | Nickel | μg Ni/1 | 50 |
| 7. | Lead | μg Pb/1 | 50 |
| 8. | Antimony | μg Sb/1 | 10 |
| 9. | Selenium | μg Se/1 | 10 |
| 10. | Pesticides and related products: (a) individual substances | μg/1 | 0.1 |
(b)total substances(i) | μg/1 | 0.5 | |
| 11. | Polycyclic aromatic hydrocarbons(ii) | μg/1 | 0.2 |
Table C
| Item | Parameters | Units of Measurement | Maximum Concentration |
|---|---|---|---|
| Note: (i) Analysis by multiple tube method. | |||
| 1. | Total coliforms | number/100 ml | 0 |
| 2. | Faccal coliforms | number/100 ml | 0 |
| 3. | Faccal streptococci | number/100 ml | 0 |
| 4. | Sulphite-reducing clostridia | number/20 ml | ≤1(i) |
| 5. | Colony counts | number/1 ml at 22°C or 37°C | No significant increase over that normally observed |
Table D(i)
| Item | Parameters | Units of Measurement | Maximum Concentration or Value |
|---|---|---|---|
| Note: (i) See regulation 3(3)(d). | |||
| 1. | Conductivity | μS/cm | 1500 at 20°C |
| 2. | Chloride | mg Cl/1 | 400 |
| 3. | Calcium | mg Ca/1 | 250 |
| 4. | Substances extractable in chloroform | mg/1 dry residue | 1 |
| 5. | Boron | μg B/1 | 2000 |
| 6. | Barium | μg Ba/1 | 1000 |
| 7. | Benzo 3,4 pyrene | μg/1 | 10 |
| 8. | Tetrachloromethane | μg/1 | 3 |
| 9. | Trichloroethene | μg/1 | 30 |
| 10. | Tetrachlorothene | μg/1 | 10 |
Table E
| Item | Parameters | Units of Measurement | Minimum Concentration(i) |
|---|---|---|---|
| Note: (i) See regulation 3(4). | |||
| 1. | Total hardness | mg Ca/1 | 60 |
| 2. | Alkalinity | mg HCO3/1 | 30 |
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