xmlns:atom="http://www.w3.org/2005/Atom"
Part IV
(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 |
Notes: | |||
* 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. | |||
(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 | |||
Coliform bacteria | <100 | 4 | |
Residual disinfectant | ≥100 | 12 per 5,000 population(i) | |
Aluminium | |||
Ammonium | |||
Clostridium perfringens (including spores)* | <100 | 1 | 2 |
100—4,999 | 2 | 4 | |
5,000—9,999 | 6 | 12 | |
Colony counts | 10,000—29,999 | 12 | 24 |
Colour | 30,000—49,999 | 18 | 36 |
Conductivity* | 50,000—79,999 | 26 | 52 |
Hydrogen ion | 80,000—100,000 | 38 | 76 |
Iron | |||
Manganese | |||
Nitrate(ii) | |||
Nitrite(ii) | |||
Odour | |||
Taste | |||
Turbidity | |||
Parameters subject to audit monitoring | |||
Aluminium | |||
Antimony | |||
Arsenic | |||
Benzene* | <100 | 1 | |
Benzo(a)pyrene | 100—4,999 | 4 | |
Boron* | 5,000—100,000 | 8 | |
Bromate(iii) | |||
Cadmium | |||
Chromium | |||
Copper | |||
Cyanide* | |||
1,2 dichloroethane* | |||
Enterococci | |||
Fluoride* | |||
Iron | |||
Lead | |||
Manganese | |||
Mercury* | |||
Nickel | |||
Nitrate (ii) | |||
Nitrite (ii) | |||
Pesticides and related products* | |||
Polycyclic aromatic | <100 | 1 | |
hydrocarbons | 100—4,999 | 4 | |
Selenium | 5,000—100,000 | 8 | |
Sodium | |||
Trichloroethene | |||
/Tetrachloroethene* | |||
Tetrachloromethane* | |||
Trihalomethanes | |||
Chloride* | |||
Sulphate* | |||
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 |
Notes: | ||||
* 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) below. | ||||
(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. | ||||
(ii) Sampling at treatment works when chloramination 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 | |||
14. | Fluoride | |||
15. | Mercury | <20 | 1 | |
16. | Nitrite (ii) | 20—999 | 4 | |
17. | Pesticides and Related products | 1,000—49,999 | 8 | |
50,000—89,999 | 12 | |||
90,000—299,999 | 24 | |||
300,000—649,000 | 36 | |||
18. | Trichloroethene ) Tetrachloroethene) | ≥650,000 | 48 | |
19. | Tetrachloromethane | |||
20. | Chloride | |||
21. | Sulphate | |||
22. | Total organic carbon | |||
23. | Tritium | |||
24. | Gross alpha (v) | |||
25. | Gross beta (v) |