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The Water Supply (Water Quality) (Amendment) Regulations (Northern Ireland) 2010

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Regulation 8

SCHEDULE 2Table 3 in Schedule 3 of the Water Supply (Water Quality) Regulations (Northern Ireland) 2007

This schedule has no associated Explanatory Memorandum

Table 3Annual Sampling Frequencies: Treatment Works or Supply Points

Note 1: 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 footnotes (ii) and (ii)(a) to the Table below.

Note 2: This table sets out the annual sampling frequencies for all the substances and parameters in column 2 at treatment works or supply points. The frequencies are determined according to the volume of water supplied at each treatment works or supply point (column 3). The number of samples is either the standard number in column 5 or the reduced number in column 4 (if one is given). Regulation 9 provides for the circumstances in which the reduced number of samples may be taken.

(1)

Item

(2)

Substances and parameters

(3)

Volume of water supplied m3/d

(4)

Reduced

(5)

Standard

(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.

(iia)

Sampling at treatment works when chloramination is not practised.

(iii)

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.

(iv)

To monitor for total indicative dose (for radioactivity).

1.E. coli

<20

20–1,999

2,000–5,999

6,000–11,999

≥12,000

-

12

52

104

104

4

52

104

208

365

2.Coliform bacteria
3.Colony counts
4.Nitrite(ii)
5.Residual disinfectant
6.Turbidity
Subject to check monitoring
7.Clostridium perfringens(i)

<20

20–999

1,000–1,999

2,000–5,999

6,000–9,999

10,000–15,999

16,000–32,999

33,000–49,999

50,000–67,999

68,000–84,999

85,000–101,999

102,000–119,999

120,000–241,999

242,000–484,999

485,000–728,999

-

2

6

12

18

26

52

78

104

130

156

183

365

730

1,095

2

4

12

24

36

52

104

156

208

260

312

365

730

1,460

2,190

8.Conductivity
Subject to audit monitoring
9.Benzene

<20

20–999

1,000–49,999

50,000–89,999

90,000–299,999

300,000–649,999

≥650,000

1

4

8

12

24

36

48

10.Boron
11.Bromate(iii)
11A.

Clostridium

Perfringens (including spores)

12.Cyanide
13.1,2 dichloroethane
14.Fluoride
15.Mercury
16.Nitrite(iia)
17.Pesticides and related products
18.

Trichloroethene/

Tetrachloroethene

19.Tetrachloromethane
20.Chloride
21.Sulphate
22.Total organic carbon
23.Tritium
24.Gross alpha(iv)
25.Gross beta(iv)

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