The Water Supply Regulations 2010

Regulation 9

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

“TABLE 2 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) Substances and parameters subject to monitoring	(2) Estimated population of water supply zone	(3) Reduced	(4) Standard
(i) 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.
(ii) 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.
(iii) Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required.
(iv) 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.
(v) To monitor for total indicative dose (for radioactivity).”
Subject to check monitoring
E. coli	< 100 ≥ 100		4 12 per 5,000 population(i)
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)(ii)
Colony counts
Colour
Conductivity(ii)
Hydrogen ion
Iron
Manganese
Nitrate(iii)
Nitrite(iii)
Odour
Taste
Turbidity
Subject to audit monitoring
Aluminium	<100 100–4,999 5,000–100,000			1 4 8
Antimony
Arsenic
Benzene(ii)
Benzo(a)pyrene
Boron(ii)
Bromate(iv)
Cadmium
Chromium
Clostridium perfringens (including spores)
Copper
Cyanide(ii)
1,2 dichloroethane(ii)
Enterococci
Fluoride(ii)
Iron
Lead
Manganese
Mercury(ii)
Nickel
Nitrate(iii)
Nitrite(iii)
Pesticides and related products(ii)
Polycyclic aromatic hydrocarbons
Selenium
Sodium
Trichloroethene/
Tetrachloroethene(ii)
Tetrachloromethane(ii)
Trihalomethanes
Chloride(ii)
Sulphate(ii)
Total organic carbon(ii)
Tritium(ii)
Gross alpha(ii) (v)
Gross beta(ii) (v)