3.—(1) A local authority must undertake monitoring for Group B parameters in accordance with this Part.
(2) “Monitoring for Group B parameters” means sampling for each parameter listed in Part 1 or 2 of Schedule 1 (other than Group A parameters already being sampled under Part 1 of this Schedule)—
(a)in order to provide information necessary to determine whether or not the private water supply satisfies each concentration, value or state specified in either of those Parts of that Schedule; and
(b)if disinfection is used, to check that disinfection by-products are kept as low as possible without compromising the effectiveness of disinfection.
4. Sampling for Group B parameters must be carried out at the frequencies specified in Table 3.
| Volume m3/day | Sampling frequency per year |
|---|---|
| ≤10 | 1 |
| ˃ 10 ≤ 3,300 | 2 |
| ˃ 3,300 ≤ 6,600 | 3 |
| ˃ 6,600 ≤ 100,00 | 4 |
| ˃ 10,000 ≤ 100,000 | 3 + 1 for each 10,000 m3/day of the total volume (rounding up to the nearest multiple of 10,000 m3/day) |
| ˃ 100,000 | 10 + 1 for each 25,000 m3/day of the total volume (rounding up to the nearest multiple of 25,000 m3/day) |