The Water Supply Regulations 2010 (revoked)

Regulation 9

SCHEDULE 1 E+W Table 2 in Schedule 3 of the Water Supply (Water Quality) Regulations 2000

“TABLE 2 E+W Annual Sampling Frequencies: Water Supply Zones

Note: This table sets out the annual sampling frequencies for all the substances and parameters in column 1. These are determined for each water supply zone according to its estimated population (column 2). The number of samples is either the standard number in column 4 or the reduced number in column 3 (if one is given). Regulation 9 provides for the circumstances in which the reduced number of samples may be taken.

1 Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000.
2 Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (iii) and (iv) below.
3 Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required.
4 Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points.
5 To monitor for total indicative dose (for radioactivity).”
(1) Substances and parameters subject to monitoring	(2) Estimated population of water supply zone	(3) Reduced	(4) Standard
Subject to check monitoring
E. coli	< 100 ≥ 100		4 12 per 5,000 population1
Coliform bacteria
Residual disinfectant
Aluminium	<100 100–4,999 5,000–9,999 10,000–29,999 30,000–49,999 50,000–79,999 80,000–100,000	1 2 6 12 18 26 38	2 4 12 24 36 52 76
Ammonium
Clostridium perfringens (including spores)2
Colony counts
Colour
Conductivity2
Hydrogen ion
Iron
Manganese
Nitrate3
Nitrite3
Odour
Taste
Turbidity
Subject to audit monitoring
Aluminium	<100 100–4,999 5,000–100,000			1 4 8
Antimony
Arsenic
Benzene2
Benzo(a)pyrene
Boron2
Bromate4
Cadmium
Chromium
Clostridium perfringens (including spores)
Copper
Cyanide2
1,2 dichloroethane2
Enterococci
Fluoride2
Iron
Lead
Manganese
Mercury2
Nickel
Nitrate3
Nitrite3
Pesticides and related products2
Polycyclic aromatic hydrocarbons
Selenium
Sodium
Trichloroethene/
Tetrachloroethene2
Tetrachloromethane2
Trihalomethanes
Chloride2
Sulphate2
Total organic carbon2
Tritium2
Gross alpha25
Gross beta25

Regulation 9

SCHEDULE 2 E+W Table 3 in Schedule 3 of the Water Supply (Water Quality) Regulations 2000

“Table 3 E+W Annual 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 (i) and (iv) 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 Sampling at treatment works when chloramination is practised.
2 Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3).
3 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.
4 Sampling at treatment works when chloramination is not practised.
5 To monitor for total indicative dose (for radioactivity).”
(1) Item	(2) Substances and parameters	(3) Volume of water supplied m3/d	(4) Reduced	(5) Standard
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.	Nitrite1
5.	Residual disinfectant
6.	Turbidity
Subject to check monitoring
7.	Clostridium perfringens 2	<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.	Bromate3
11A.	Clostridium Perfringens (including spores)
12.	Cyanide
13.	1,2 dichloroethane
14.	Fluoride
15.	Mercury
16.	Nitrite4
17.	Pesticides and related products
18.	Trichloroethene/ Tetrachloroethene
19.	Tetrachloromethane
20.	Chloride
21.	Sulphate
22.	Total organic carbon
23.	Tritium
24.	Gross alpha5
25.	Gross beta5