Regulations 2 and 4
Item | Parameters | Concentration or Value (maximum) | Units of measurement | Point of Compliance(*) |
---|---|---|---|---|
(*) Where water is supplied from a tanker see regulation 4(3)(a) | ||||
1. | Enterococci | 0 | number/100ml | Consumers’ taps |
2. | Escherichia coli (E. coli) | 0 | number/100ml | Consumers’ taps |
Item | Parameters | Concentration or Value (maximum) | Units of measurement | Point of Compliance |
---|---|---|---|---|
(**) Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 4(6)). | ||||
1. | Coliform bacteria | 0 | number/100ml | Service reservoirs(**) and water treatment works |
2. | Escherichia coli (E. coli) | 0 | number/100ml | Service reservoirs and water treatment works |
Item | Parameters | Concentration or Value (maximum) | Units of Measurement | Point of compliance |
---|---|---|---|---|
Notes: (i) The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification. (ii) See also regulation 6(6). (iii) See also regulation 4(2)(d). (iv) See the definition of “pesticides and related products” in regulation 2. (v) The parametric value applies to each individual pesticide. (vi) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. (vii) The specified compounds are:
The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (viii) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (ix) The specified compounds are:
The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. | ||||
1. | Acrylamide | 0.10 | µg/l | (i) |
2. | Antimony | 5.0 | µgSb/l | Consumers’ taps |
3. | Arsenic | 10 | µgAs/l | Consumers’ taps |
4 | Benzene | 1.0 | µg/l | Consumers’ taps |
5 | Benzo(a)pyrene | 0.010 | µg/l | Consumers’ taps |
6 | Boron | 1.0 | mgB/l | Consumers’ taps |
7 | Bromate | 10 | µgBrO3/l | Consumers’ taps |
8 | Cadmium | 5.0 | µgCd/l | Consumers’ taps |
9 | Chromium | 50 | µgCr/l | Consumers’ taps |
10 | Copper (ii) | 2.0 | mgCu/l | Consumers’ taps |
11 | Cyanide | 50 | µgCN/l | Consumers’ taps |
12 | 1, 2 dichloroethane | 3.0 | µg/l | Consumers’ taps |
13 | Epichlorohydrin | 0.10 | µg/l | (i) |
14 | Fluoride | 1.5 | mgF/l | Consumers’ taps |
15 | Lead (ii) | (a) 25, from 25th December 2003 until immediately before 25th December 2013 | µgPb/l | Consumers’ taps |
(b) 10, on and after 25th December 2013 | µgPb/l | Consumers’ taps | ||
16 | Mercury | 1.0 | µgHg/l | Consumers’ taps |
17 | Nickel (ii) | 20 | µgNi/l | Consumers’ taps |
18 | Nitrate (iii) | 50 | mgNO3/l | Consumers’ taps |
19 | Nitrite (iii) | 0.50 | mgNO2/l | Consumers’ taps |
0.10 | Treatment works | |||
20 | Pesticides (iv) (v) Aldrin Dieldrin Heptachlor Heptachlor epoxide | 0.030 | µg/l | Consumers’ taps |
other pesticides | 0.10 | µg/l | Consumers’ taps | |
21 | Pesticides: Total (vi) | 0.50 | µg/l | Consumers’ taps |
22 | Polycyclic aromatic hydrocarbons (vii) | 0.10 | µg/l | Consumers’ taps |
23 | Selenium | 10 | µgSe/l | Consumers’ taps |
24 | Tetrachloroethene and Trichloroethene (viii) | 10 | µg/l | Consumers’ taps |
25 | Trihalomethanes: Total (ix) | 100 | µg/l | Consumers’ taps |
26 | Vinyl chloride | 0.50 | µg/l | (i) |
Item | Parameters | Concentration or Value (maximum unless otherwise stated) | Units of measurement | Point of compliance |
---|---|---|---|---|
1. | Aluminium | 200 | µgAl/l | Consumers’ taps |
2. | Colour | 20 | mg/l Pt/Co | Consumers’ taps |
3. | Hydrogen ion | 10.0 | pH value | Consumers’ taps |
6.5 (minimum) | pH value | |||
4. | Iron | 200 | µgFe/l | Consumers’ taps |
5. | Manganese | 50 | µgMn/l | Consumers’ taps |
6. | Odour | 3 at 25°C | Dilution number | Consumers’ taps |
7. | Sodium | 200 | mgNa/l | Consumers’ taps |
8. | Taste | 3 at 25°C | Dilution number | Consumers’ taps |
9. | Tetrachloromethane | 3 | µg/l | Consumers’ taps |
10. | Turbidity | 4 | NTU | Consumers’ taps |
Item | Parameters | Concentration or Value (maximum unless otherwise stated) | Units of measurement | Point of compliance |
---|---|---|---|---|
1. | Aluminium | 200 | µgAl/l | Consumers’ taps |
2. | Colour | 20 | mg/l Pt/Co | Consumers’ taps |
3. | Hydrogen ion | 10.0 | pH value | Consumers’ taps |
6.5 (minimum) | pH value | |||
4. | Iron | 200 | µgFe/l | Consumers’ taps |
5. | Manganese | 50 | µgMn/l | Consumers’ taps |
6. | Odour | 3 at 25°C | Dilution number | Consumers’ taps |
7. | Sodium | 200 | mgNa/l | Consumers’ taps |
8. | Taste | 3 at 25°C | Dilution number | Consumers’ taps |
9. | Tetrachloromethane | 3 | µg/l | Consumers’ taps |
10. | Turbidity | 4 | NTU | Consumers’ taps |
Regulations 2 and 4
Item | Parameters | Specification Concentration or Value (maximum) or State | Units of Measurement | Point of monitoring |
---|---|---|---|---|
(*) May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution | ||||
Notes: (i) The water should not be aggressive. (ii) Excluding tritium, potassium-40, radon and radon decay products. | ||||
1 | Ammonium | 0.50 | mgNH4/l | Consumers’ taps |
2 | Chloride (i) | 250 | mgCl/l | Supply point(*) |
3 | Clostridium perfringens (including spores) | 0 | Number/100ml | Supply point(*) |
4 | Coliform bacteria | 0 | Number/100ml | Consumers’ taps |
5 | Colony counts | No abnormal change | Number/1ml at 22°C Number/1ml at 37°C | Consumers’ taps, service reservoirs and treatment works |
6 | Conductivity (i) | 2500 | µS/cm at 20°C | Supply point(*) |
7 | Hydrogen ion | 9.5 | pH value | Consumers’ taps |
8 | Sulphate (i) | 250 | mgSO4/l | Supply point(*) |
9 | Total indicative dose (for radioactivity) (ii) | 0.10 | mSv/year | Supply point(*) |
10 | Total organic carbon (TOC) | No abnormal change | mgC/l | Supply point(*) |
11 | Tritium (for radioactivity) | 100 | Bq/l | Supply point(*) |
12 | Turbidity | 1 | NTU | Treatment works |
(1) | (2) | (3) |
---|---|---|
Item | Parameter | Circumstances |
1 | Aluminium | When used as flocculant or where the water originates from, or is influenced by, surface waters |
2 | Ammonium | |
3 | Clostridium perfringens (including spores) | Where the water originates from, or is influenced by, surface waters |
4 | Coliform bacteria | |
5 | Colony Counts | |
6 | Colour | |
7 | Conductivity | |
8 | Escherichia coli (E. coli) | |
9 | Hydrogen ion | |
10 | Iron | When used as flocculant or where the water originates from, or is influenced by, surface waters |
11 | Manganese | Where the water originates from, or is influenced by, surface waters |
12 | Nitrate | When chloramination is practised |
13 | Nitrite | When chloramination is practised |
14 | Odour | |
15 | Taste | |
16 | Turbidity |
(1) | (2) | (3) | (4) |
---|---|---|---|
Substances and parameters subject to check monitoring | Estimated population of water supply zone | Reduced | Standard |
(*) Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and (iii) below. | |||
Notes: (i) Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000. (ii) Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required. (iii) Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points. (iv) To monitor for total indicative dose (for radioactivity). | |||
E. coli | <100 | 4 | |
Coliform bacteria | ≥100 | 12 per 5,000 population (i) | |
Residual disinfectant | |||
Aluminium | |||
Ammonium | |||
Clostridium perfringens | |||
(including spores)* | |||
Colony counts | |||
Colour | <100 | 1 | 2 |
Conductivity* | 100-4,999 | 2 | 4 |
Hydrogen ion | 5,000-9,999 | 6 | 12 |
Iron | 10,000-29,999 | 12 | 24 |
Manganese | 30,000-49,999 | 18 | 36 |
Nitrate (ii) | 50,000-79,999 | 26 | 52 |
Nitrite (ii) | 80,000-100,000 | 38 | 76 |
Odour | |||
Taste | |||
Turbidity | |||
Aluminium | |||
Antimony | |||
Arsenic | |||
Benzene(*) | |||
Benzo(a)pyrene | |||
Boron(*) | |||
Bromate (iii) | |||
Cadmium | |||
Chromium | |||
Copper | |||
Cyanide(*) | |||
1,2 dichloroethane(*) | <100 | 1 | |
Enterococci | 100-4,999 | 4 | |
Fluoride(*) | 5,000-100,000 | 8 | |
Iron | |||
Lead | |||
Manganese | |||
Mercury(*) | |||
Nickel | |||
Nitrate (ii) | |||
Nitrite (ii) | |||
Pesticides and related products(*) | |||
Polycyclic aromatic hydrocarbons | |||
Selenium | |||
Sodium | |||
Trichloroethene/Tetrachloroethene(*) | |||
Tetrachloromethane(*) | |||
Trihalomethanes | <100 | 1 | |
Chloride(*) | 100-4,999 | 4 | |
Sulphate(*) | 5,000-100,000 | 8 | |
Total organic carbon(*) | |||
Tritium(*) | |||
Gross alpha(*) (iv) | |||
Gross beta(*) (iv) |
(1) | (2) | (3) | (4) | (5) | |
---|---|---|---|---|---|
Item | Substances and parameters | Volume of water supplied m3/d | Reduced | Standard | |
(*) Sampling is at treatment works for the substances and parameters shown in column (1) of the Table as items 1 to 6 and at supply points for the other substances and parameters, except nitrite, subject to notes (ii) and (iii); (i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3). (ii) Sampling at treatment works when chloramination is practised. (iii) Sampling at treatment works when chloromination is not practised. (iv) Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones. (v) To monitor for total indicative dose (for radioactivity). | |||||
1 | E. coli | <20 | 4 | ||
2 | Coliform bacteria | 20-1,999 | 12 | 52 | |
3 | Colony counts | 2,000-5,999 | 52 | 104 | |
4 | Nitrite (ii) | 6,000-11,999 | 104 | 208 | |
5 | Residual disinfectant | ≥12,000 | 104 | 365 | |
6 | Turbidity | ||||
Subject to check monitoring | |||||
7 | Clostridium perfringens (i) | <20 | 2 | ||
20-999 | 2 | 4 | |||
8 | Conductivity | 1,000-1,999 | 6 | 12 | |
2,000-5,999 | 12 | 24 | |||
6,000-9,999 | 18 | 36 | |||
10,000-15,999 | 26 | 52 | |||
16,000-32,999 | 52 | 104 | |||
33,000-49,999 | 78 | 156 | |||
50,000-67,999 | 104 | 208 | |||
68,000-84,999 | 130 | 260 | |||
85,000-101,999 | 156 | 312 | |||
102,000-119,999 | 183 | 365 | |||
120,000-241,999 | 365 | 730 | |||
242,000-484,999 | 730 | 1,460 | |||
485,000-728,999 | 1,095 | 2,190 | |||
Subject to audit monitoring | |||||
9 | Benzene | ||||
10 | Boron | ||||
11 | Bromate (iv) | ||||
12 | Cyanide | ||||
13 | 1,2 dichloroethane | <20 | 1 | ||
14 | Fluoride | 20-999 | 4 | ||
15 | Mercury | 1,000-49,999 | 8 | ||
16 | Nitrite (iii) | 50,000-89,999 | 12 | ||
17 | Pesticides and | 90,000-299,999 | 24 | ||
related products | 300,000-649,999 | 36 | |||
18 | Trichloroethene | ≥650,000 | 48 | ||
Tetrachloroethene | |||||
19 | Tetrachloromethane | ||||
20 | Chloride | ||||
21 | Sulphate | ||||
22 | Total organic carbon | ||||
23 | Tritium | ||||
24 | Gross alpha (v) | ||||
25 | Gross beta (v) |
(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 microoganisms | 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 for 15 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 |
(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 |
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 4 NTU. (vi) The performance characteristics apply to the specification of 1 NTU for water leaving treatment works. | |||
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 |
Tetrachloroethene (iv) | 25 | 25 | 10 |
Tetrachloromethane | 20 | 20 | 20 |
Trichloroethene (iv) | 25 | 25 | 10 |
Trihalomethanes: | 25 | 25 | 10 |
Total (iii) | |||
Turbidity (v) | 10 | 10 | 10 |
Turbidity (vi) | 25 | 25 | 25 |