1.—(1) A local authority must undertake monitoring for Group A parameters in accordance with this Part.
(2) “Monitoring for Group A parameters” means sampling for each parameter listed in column 1 of Table 1 in the circumstances listed in the corresponding entry for that parameter in column 2 of that Table, in order to—
(a)determine whether or not water complies with the concentrations or values in Schedule 1;
(b)provide information on the organoleptic and microbiological quality of the water; and
(c)establish the effectiveness of the treatment of the water, including disinfection.
Parameter | Circumstances |
|---|---|
| Aluminium | If used as a water treatment chemical |
| Ammonium | If chloramination is used |
| Clostridium perfringens (including spores) | Where the water originates from, or is influenced by, surface waters |
| Coliform bacteria | In all supplies |
| Colony counts | In all supplies |
| Colour | In all supplies |
| Conductivity | In all supplies |
| Escherichia coli (E. coli) | In all supplies |
| Hydrogen ion concentration | In all supplies |
| Iron | If used as a water treatment chemical |
| Manganese | Where the water originates from, or is influenced by, surface waters |
| Nitrate | If chloramination is used |
| Nitrite | If chloramination is used |
| Odour | In all supplies |
| Pseudomonas aeruginosa | Only in the case of water in bottles or containers |
| Taste | In all supplies |
| Turbidity | In all supplies |
2. Sampling for Group A parameters must be carried out at frequencies specified in Table 2.
| Volume m3/day | Sampling frequency per year |
|---|---|
| ≤10 | 1 |
| ˃ 10 ≤ 100 | 2 |
| ˃ 100 ≤ 1,000 | 4 |
| ˃ 1,000 ≤ 2,000 | 10 |
| ˃ 2,000 ≤ 3,000 | 13 |
| ˃ 3,000 ≤ 4,000 | 16 |
| ˃ 4,000 ≤ 5,000 | 19 |
| ˃ 5,000 ≤ 6,000 | 22 |
| ˃ 6,000 ≤ 7,000 | 25 |
| ˃ 7,000 ≤ 8,000 | 28 |
| ˃ 8,000 ≤ 9,000 | 31 |
| ˃ 9,000 ≤ 10,000 | 34 |
| ˃ 10,000 | 4 + 3 for each 1,000 m3/day of the total volume (rounding up to the nearest multiple of 1,000 m3/day) |