# The Water Supply (Water Quality) (Amendment) Regulations 1991, Paragraph 26


In Schedule 3–
(a) in Tables 1, 3 and 5 to 7, after “domestic purposes” wherever they occur insert “(and, if water is supplied for food production purposes, for those purposes)”;
(b) for Table 2 substitute–
“
Table 2: Sampling frequencies at consumers' taps
Parameters
Water Supply Zone
Sampling Frequency (number per annum)
Volume distributed (m3/d) for domestic purposes (and, if water is supplied for food production purposes, for those purposes)
Population Supplied
Reduced
Standard
Increased
Ground Water
Surface Water
Turbidity
Temperature
Hydrogen ion
Nitrate
Nitrite
Ammonium
Iron
Aluminium
Manganese
Colour
≤100
101-1000
1001-2000
2001-4000
4001-7000
7001-10000
≤500
501-5000
5001-10000
10001-20000
20001-35000
35001-50000
4
4
4
4
5
5
4
4
4
6
10
10
12
12
24
24
36
48
”
“
Table 2A: Sampling frequencies at consumers' taps
Parameters
Water Supply Zone
Sampling Frequency (number per annum)
Volume distributed (m3/d) for domestic purposes (and, if water is supplied for food production purposes, for those purposes)
Population Supplied
Reduced
Standard
Increased
Ground Water
Surface Water
Odour
(quantitative)
Taste
(quantitative)
≤100
101-1000
1001-2000
2001-4000
4001-7000
7001-10000
≤500
501-5000
5001-10000
10001-20000
20001-35000
35001-50000
1
1
1
1
1
2
4
5
5
4
4
4
6
10
10
12
12
24
24
36
48
”
(c) in Table 6, after “standard number is 52.” insert “In cases where the population is not an exact multiple of 5000, the population figure should be rounded up to the nearest multiple of 5000”.

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Source: https://www.legislation.gov.uk/uksi/1991/1837/schedule/paragraph/26 (the official version)
Page: https://openlegislation.uk/water-supply-water-quality-amendment-regulations-1991/schedule/paragraph-26
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.