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The Private Water Supplies Regulations 1991
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- 1991 No. 2790
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SCHEDULE 1EXERCISE OF POWERS
1. The powers conferred by sections 67 and 213(2) of the Water Industry Act 1991 are exercised–
(a)to the extent that they relate to the matters specified in section 67(2)(a) to (d), by the Secretary of State for the Environment and the Secretary of State for Wales jointly;
(b)to the extent that they relate to the matters specified in section 67(2)(e), by the Secretary of State for the Environment in relation to water supplied in England and by the Secretary of State for Wales in relation to water supplied in Wales; and
(c)to the extent that they relate to the matter specified in section 67(2)(f), by the Secretary of State for the Environment in relation to local authorities exercising functions in England and by the Secretary of State for Wales in relation to local authorities exercising functions in Wales.
2. The powers conferred by section 77(3) and (4) of that Act (and section 213(2) to the extent it relates to those subsections) are exercised by the Secretary of State for the Environment in relation to local authorities exercising functions in England and by the Secretary of State for Wales in relation to local authorities exercising functions in Wales.
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 |
Regulations 14 to 16
SCHEDULE 3SAMPLING FREQUENCIES FOR CLASSES A, B, 1 AND 2
| Sampling Frequency (number per annum) | Sampling Frequency (number per annum) | |||||
|---|---|---|---|---|---|---|
| Parameter | Class A and Class 1 | Class B and Class 2 | ||||
| Reduced | Standard | Increased | Reduced | Standard | Increased | |
| (1) | (2) | (3) | (4) | (5) | (6) | (7) |
Notes: (i) Increased or reduced sampling where permitted or required may be confined to the substance in question. (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. | ||||||
| PART I: | ||||||
| Conductivity | 6 | 12 | 24 | 4 | 6 | 12 |
| Hydrogen ion | 6 | 12 | 24 | 4 | 6 | 12 |
| Odour (qualitative) | 6 | 12 | 24 | 4 | 6 | 12 |
| Taste (qualitative) | 6 | 12 | 24 | 4 | 6 | 12 |
| PART II: | ||||||
| Odour (quantitative) | — | 4 | 24 | — | 4 | 12 |
| Taste (quantitative) | — | 4 | 24 | — | 4 | 12 |
| Turbidity | — | 4 | 24 | — | 4 | 12 |
| Temperature | — | 4 | 24 | — | 4 | 12 |
| Nitrate | — | 4 | 24 | — | 4 | 12 |
| Nitrite | — | 4 | 24 | — | 4 | 12 |
| Ammonium | — | 4 | 24 | — | 4 | 12 |
| Iron | — | 4 | 24 | — | 4 | 12 |
| Aluminium | — | 4 | 24 | — | 4 | 12 |
| Manganese | — | 4 | 24 | — | 4 | 12 |
| Colour | — | 4 | 24 | — | 4 | 12 |
| PART III: | ||||||
| Trihalomethanes | 1 | 4 | 12 | 1 | 4 | 12 |
| Tetrachloromethanes | 1 | 4 | 12 | 1 | 4 | 12 |
| Trichloroethene | 1 | 4 | 12 | 1 | 4 | 12 |
| tetrachloroethene | 1 | 4 | 12 | 1 | 4 | 12 |
| Copper | 1 | 4 | 12 | 1 | 4 | 12 |
| Lead | 1 | 4 | 12 | 1 | 4 | 12 |
| Zinc | 1 | 4 | 12 | 1 | 4 | 12 |
| Pesticides and related prodcts(i) | 1 | 4 | 12 | 1 | 4 | 12 |
| Polycyclic aromatic hydrocarbons(ii) | 1 | 4 | 12 | 1 | 4 | 12 |
| PART IV: | ||||||
| Chloride | — | 1 | 12 | — | 1 | 12 |
| Sulphate | — | 1 | 12 | — | 1 | 12 |
| Calcium | — | 1 | 12 | — | 1 | 12 |
| Magnesium | — | 1 | 12 | — | 1 | 12 |
| Sodium | — | 1 | 12 | — | 1 | 12 |
| Potassium | — | 1 | 12 | — | 1 | 12 |
| Dry residues | — | 1 | 12 | — | 1 | 12 |
| Ozidizability (permanganatge value) | — | 1 | 12 | — | 1 | 12 |
| Total organic carbon | — | 1 | 12 | — | 1 | 12 |
| Boron | — | 1 | 12 | — | 1 | 12 |
| Surfactants | — | 1 | 12 | — | 1 | 12 |
| Phosphorus | — | 1 | 12 | — | 1 | 12 |
| Fluoride | — | 1 | 12 | — | 1 | 12 |
| Barium | — | 1 | 12 | — | 1 | 12 |
| Silver | — | 1 | 12 | — | 1 | 12 |
| Arsenic | — | 1 | 12 | — | 1 | 12 |
| Cadmium | — | 1 | 12 | — | 1 | 12 |
| Cyanide | — | 1 | 12 | — | 1 | 12 |
| Chromium | — | 1 | 12 | — | 1 | 12 |
| Mercury | — | 1 | 12 | — | 1 | 12 |
| Nickel | — | 1 | 12 | — | 1 | 12 |
| Antimony | — | 1 | 12 | — | 1 | 12 |
| Selenium | — | 1 | 12 | — | 1 | 12 |
| Total Hardness | — | 1 | 12 | — | 1 | 12 |
| Alkalinity | — | 1 | 12 | — | 1 | 12 |
| PART V: | ||||||
| Total coliforms | — | 24 | — | — | 12 | 24 |
| Faecal coliforms | — | 24 | — | — | 12 | 24 |
| Residual disinfectant | — | 24 | — | — | 12 | 24 |
| Colony counts | — | 24 | — | — | 12 | 24 |
Regulation 18
SCHEDULE 4SAMPLING FOR CLASSES C, D, E, 3, 4 AND 5
PART IFREQUENCY
| Number of Samples(1) | |||
|---|---|---|---|
| Class of Supply | Basic Parameters(2) | Additional Parameters(3) | Coliform Parameters(4) |
Notes: (1) Samples are to be taken each year except in the case of class E supplies (see note 5). If more than one sample is required, the samples must be taken on separate occasions. (2) The basic parameters are listed in column (1) of Part II of this Schedule. (3) The additional parameters are listed in column (2) of Part II of this Schedule. The local authority must sample for any additional parameters which they consider should be taken because of the characteristics of the locality or of the supply’s distribution system. (4) The coliform parameters are total coliforms and faecal coliforms. Sampling for coliform parameters is additional to the coliform sampling carried out as part of sampling for basic parameters and must be carried out on separate occasions. (5) Class E supplies are to be sampled once for basic and additional parameters before 31st December 1994 unless– (a) they have been sampled for those parameters during 1990 or 1991; and (b) the local authority have reasonable grounds for believing that no change has occurred or is likely to occur which may cause the quality of the supply to deteriorate. From 1st January 1995 all class E supplies are to be sampled once every 5 years. (6) The sampling frequency should be halved if the premises served by the supply are used for not more than six months in the year. (7) In 1992, or in the first year in which the supply is used as a class 3 supply, 2 samples must be taken in the first two months of the year and 3 in the remainder of that year. | |||
| C | 1 | 1 | 1 |
| D | 1 | 1 | — |
| E(5) | 1 | 1 | — |
| 3 | 2(6) | 2(6) | 4(6) (7) |
| 4 | 2(6) | 1(6) | — |
| 5 | — | — | 1 |
PART IIPARAMETERS
| Basic parameters | Additional Parameters | ||
|---|---|---|---|
| (1) | (2) | ||
Notes: (1) Samples need not be analysed for lead if the local authority are satisfied that lead pipework or solder is not present in the plumbing of the property or that naturally occurring lead is not present in the water. (2) Samples need not be analysed for nitrate if the local authority are satisfied that nitrate levels in the locality concerned are below 25 mg NO3/l. (3) Samples should not be assessed qualitatively for taste if the person taking the samples has any reason to suspect that the water may give rise to a health hazard. (4) 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. | |||
| Hydrogen ion | Odour (quantitative) | Zinc | Fluoride |
| Conductivity | Taste (quantitative) | Polycyclic aromatic hydrocarbons(4) | Barium |
| Total coliforms | Temperature | Silver | |
| Faecal coliforms | Nitric | Chloride | Arsenic |
| Lead (1) | Ammonium | Sulphate | Cadmium |
| Nitrate(2) | Iron | Calcium | Cyanide |
| Odour (qualitative) | Aluminium | Magnesium | Chromium |
| Taste (qualitative)(3) | Manganese | Sodium | Mercury |
| Turbidity | Colour | Potassium | Nickel |
| Trihalomethanes | Dry residues | Antimony | |
| Tetrachloromethane | Oxidazability (permanent value) | Selenium | |
| Trichloroethene | Total hardness | ||
| Tetrachloroethene | Totl organic carbon | Alkalinity | |
| Copper | Boron | Residual disinfectant | |
| Surfaciants | Colony counts | ||
| Phosphorus | |||
Regulation 20(1)(b)
SCHEDULE 5
MAXIMUM CHARGES FOR SAMPLING AND ANALYSIS
| Class of supply | Parameters sampled and analysed | Maximum charge | |
|---|---|---|---|
| A, B, 1, 2 | Schedule 3: | ||
| Part I | £20 | ||
| Part II | £40 | ||
| Part III | £270 | ||
| Part IV | £350 | ||
| Part V | £20 | ||
| All parameters | £700 | ||
| C, D, E, 3, 4, 5 | Schedule 4: | ||
| Basic parameters | £40 | ||
| Additional parameters | Odour (quantitative) Taste (quantitative) Temperature Nitrite Ammonium Iron Aluminium Manganese Colour | £30 for all or any of these parameters) | |
Trihalomethanes Tetrachloromethane Trichloroethene Tetrachloroethene | £50 (for all or any of these parameters) | ||
Copper Zinc | £15 (for both parameters or either of them) | ||
Polycyclic aromatic hydrocarbons vBenzo 3,4 pyrene | £ (for both parameters or either of them) | ||
Chloride Sulphate Calcium Magnesium Sodium Potassium Dry residues Oxidizability | £40 (for all or any of these parametrs) | ||
| Total organic carbon | £20 | ||
| Boron | £40 | ||
| Surfactants | £40 | ||
Phosphorus Cyanide | £80 (for both parameters or either of them) | ||
Fluoride Total hardness Alkalinity | £20 (for all or any of these parameters) | ||
Barium Silver Arsenic Cadmium Chromium Mercury Nickel Antimony Selenium | £100 (for all or any of these parameters) | ||
Residual disinfactant Colony counts | £15 (for both parameters or either of them) | ||
| Coliform parameters | £20 | ||
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