SCHEDULE 3Monitoring
PART 1Check Monitoring
Sampling
1.
Check monitoring means sampling for each parameter listed in Table A in the circumstances listed in that table.
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 |
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 |
Taste | In all supplies |
Turbidity | In all supplies |
Disinfectant residual | When disinfection treatment is practised. |
Frequency of sampling
2.
(1)
Sampling shall be carried out at frequencies specified in Table B of this Schedule.
Volume m3/day | Sampling frequency per year |
|---|---|
≤10 > 10 ≤ 100 > 100 ≤ 1,000 > 1,000 ≤ 2,000 > 2,000 ≤ 3,000 > 3,000 ≤ 4,000 > 4,000 ≤ 5,000 > 5,000 ≤ 6,000 > 6,000 ≤ 7,000 > 7,000 ≤ 8,000 > 8,000 ≤ 9,000 > 9,000 ≤ 10,000 > 10,000 | 1 2 4 10 13 16 19 22 25 28 31 34 4 + 3 for each 1,000 m3/day of the total volume (rounding up to the nearest multiple of 1,000 m3/day) |
(2)
The Department may reduce the frequency of sampling for a parameter to a frequency not less than half if—
(a)
it is of the opinion that the quality of water in the supply is unlikely to deteriorate;
(b)
in the case of hydrogen ion the parameter has had a pH value that is not less than 6.5 and not more than 9.5; and
(c)
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 laid down in Schedule 1.
(3)
The Department may set a higher frequency for any parameter if it considers it appropriate taking into account the findings of any risk assessment and, in addition, may monitor anything else identified in the risk assessment.
PART 2Audit Monitoring
Sampling
3.
(1)
Audit monitoring means sampling for each parameter listed in Schedule 1 (other than parameters already being sampled under check monitoring).
(2)
The Department may, for such time as it may decide, exclude a parameter from the audit monitoring of a private supply—
(a)
if the Department considers that the parameter in question is unlikely to be present in the supply or system at a concentration or value which poses a risk of the private supply failing to meet the concentration, value or state specified in Schedule 1 in respect of that parameter; and
(b)
taking into account the findings of any risk assessment.
(3)
The Department may monitor anything else identified in the risk assessment.
Frequency of sampling
4.
(1)
Sampling shall be carried out at the frequencies specified in Table C of this Schedule.
Volume m3 /day | Sampling frequency per year |
|---|---|
≤ 1000 | 1 |
> 1000 ≤ 10,000 | 1 + 1 for each 3,300 m3/day of the total volume (rounding up to the nearest multiple of 3,300 m3/day) |
> 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) |
(2)
The Department may set a higher frequency for any parameter if it considers it appropriate taking into account the findings of any risk assessment.