Regulation 9
SCHEDULE 2Monitoring
PART 1Check monitoring
Sampling
1.—(1) A local authority must undertake check monitoring in accordance with this Part.
(2) “Check monitoring” means sampling for each parameter listed in Table 1 in the circumstances listed in 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.
Table 1
Check monitoring
| Parameter | Circumstances |
|---|---|
| Aluminium | When used as flocculant or where the water originates from, or is influenced by, surface waters |
| Ammonium | In all supplies |
| 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 | In all supplies |
| Iron | When used as flocculant or where the water originates from, or is influenced by, surface waters |
| Manganese | Where the water originates from, or is influenced by, surface waters |
| Nitrate | When chloramination is practised |
| Nitrite | When chloramination is practised |
| Odour | In all supplies |
| Pseudomonas aeruginosa | Only in the case of water in bottles or containers |
| Taste | In all supplies |
| Turbidity | In all supplies |
Frequency of sampling
2.—(1) Sampling must be carried out at the frequencies specified in Table 2.
Table 2
Sampling frequency for check monitoring
| 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 1,000m3/day of the total volume (rounding up to the nearest multiple of 1,000m3/day) |
(2) A local authority may reduce the frequency of sampling for a parameter to a frequency not less than half if the local authority is of the opinion that the quality of water in the supply is unlikely to deteriorate and—
(a)in the case of the hydrogen ion parameter, the supply has no pH value that is below 6.5 and above 9.5;
(b)in all other cases, in each of two successive years the results of samples taken for the purposes of monitoring the parameter in question are constant and significantly lower than the concentrations or values referred to in Schedule 1.
(3) The local authority may set a higher frequency for any parameter if it considers it appropriate, taking into account the findings of any risk assessment, and may monitor anything else identified in the risk assessment.
PART 2Audit monitoring
Sampling
3.—(1) A local authority must undertake audit monitoring in accordance with this Part.
(2) “Audit monitoring” means sampling for each parameter listed in Parts 1 and 2 of Schedule 1 (other than parameters already being sampled under check monitoring)—
(a)in order to provide information necessary to determine whether or not the private water supply satisfies each concentration, value or state prescribed in those Parts of that Schedule, and
(b)if disinfection is used, in order to check that disinfection by-products are kept as low as possible without compromising the effectiveness of disinfection.
(3) The local authority may, for such time as it may decide, exclude a parameter from audit monitoring of a private water supply—
(a)if it considers that the parameter in question is unlikely to be present in the supply or system at a concentration or value that poses a risk of the private water supply failing to meet the concentration, value or state specified in Part 1 or 2 of Schedule 1 in respect of that parameter,
(b)taking into account the findings of any risk assessment, and
(c)taking into account any guidance issued by the Secretary of State.
(4) A local authority may monitor anything else identified in the risk assessment.
Frequency of sampling
4.—(1) Sampling must be carried out at the frequencies specified in Table 3.
Table 3
Sampling frequency for audit monitoring
| Volume m3/day | Sampling frequency per year |
|---|---|
| ≤ 10 | 1 |
| > 10 ≤ 3,300 | 2 |
| > 3,300 ≤ 6,600 | 3 |
| > 6,600 ≤ 10,000 | 4 |
| > 10,000 ≤ 100,000 | 3 + 1 for each 10,000m3/day of the total volume (rounding up to the nearest multiple of 10,000m3/day) |
| > 100,000 | 10 + 1 for each 25,000m3/day of the total volume (rounding up to the nearest multiple of 25,000m3/day) |
(2) A local authority may set a higher frequency for any parameter if it considers it appropriate, taking into account the findings of any risk assessment.
PART 3Minimum frequency for check monitoring and audit monitoring for water put into bottles or containers not intended for sale
| Volume(i)of water produced in bottles or containers each day (m3) | Check monitoring number of samples per year | Audit monitoring number of samples per year |
|---|---|---|
(i) The volumes are calculated as averages taken over a calendar year. | ||
| ≤10 | 1 | 1 |
| >10≤ 60 | 12 | 1 |
| >60 | 1 for each 5m3/day of the total volume (rounding up to the nearest multiple of 5m3/day) | 1 for each 100 m3/day of the total volume (rounding up to the nearest multiple of 100 m3/day) |