# The Private Water Supplies Regulations 1991, Schedule 3: SAMPLING FREQUENCIES FOR CLASSES A, B, 1 AND 2


Sampling Frequency (number per annum)
Sampling Frequency (number per annum)
Parameter
Class A and Class 1
Class B and Class 2
Reduced
Standard
Increased
Reduced
Standard
Increased
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Notes:
(i) Increased or reduced sampling where permitted or required may be confined to the substance in question.
(ii) The sum of the detected concentrations of fluoranthene, benzo 3.4 fluoranthene, benzo 11.12 fluoranthene, benzo 3.4 pyrene, benzo 1.12 perylene and indeno (1,2,3-cd) pyrene.
PART I:
Conductivity
6
12
24
4
6
12
Hydrogen ion
6
12
24
4
6
12
Odour (qualitative)
6
12
24
4
6
12
Taste (qualitative)
6
12
24
4
6
12
PART II:
Odour (quantitative)
—
4
24
—
4
12
Taste (quantitative)
—
4
24
—
4
12
Turbidity
—
4
24
—
4
12
Temperature
—
4
24
—
4
12
Nitrate
—
4
24
—
4
12
Nitrite
—
4
24
—
4
12
Ammonium
—
4
24
—
4
12
Iron
—
4
24
—
4
12
Aluminium
—
4
24
—
4
12
Manganese
—
4
24
—
4
12
Colour
—
4
24
—
4
12
PART III:
Trihalomethanes
1
4
12
1
4
12
Tetrachloromethanes
1
4
12
1
4
12
Trichloroethene
1
4
12
1
4
12
tetrachloroethene
1
4
12
1
4
12
Copper
1
4
12
1
4
12
Lead
1
4
12
1
4
12
Zinc
1
4
12
1
4
12
Pesticides and related prodcts(i)
1
4
12
1
4
12
Polycyclic aromatic hydrocarbons(ii)
1
4
12
1
4
12
PART IV:
Chloride
—
1
12
—
1
12
Sulphate
—
1
12
—
1
12
Calcium
—
1
12
—
1
12
Magnesium
—
1
12
—
1
12
Sodium
—
1
12
—
1
12
Potassium
—
1
12
—
1
12
Dry residues
—
1
12
—
1
12
Ozidizability (permanganatge value)
—
1
12
—
1
12
Total organic carbon
—
1
12
—
1
12
Boron
—
1
12
—
1
12
Surfactants
—
1
12
—
1
12
Phosphorus
—
1
12
—
1
12
Fluoride
—
1
12
—
1
12
Barium
—
1
12
—
1
12
Silver
—
1
12
—
1
12
Arsenic
—
1
12
—
1
12
Cadmium
—
1
12
—
1
12
Cyanide
—
1
12
—
1
12
Chromium
—
1
12
—
1
12
Mercury
—
1
12
—
1
12
Nickel
—
1
12
—
1
12
Antimony
—
1
12
—
1
12
Selenium
—
1
12
—
1
12
Total Hardness
—
1
12
—
1
12
Alkalinity
—
1
12
—
1
12
PART V:
Total coliforms
—
24
—
—
12
24
Faecal coliforms
—
24
—
—
12
24
Residual disinfectant
—
24
—
—
12
24
Colony counts
—
24
—
—
12
24

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Source: https://www.legislation.gov.uk/uksi/1991/2790/schedule/3 (the official version)
Page: https://openlegislation.uk/private-water-supplies-regulations-1991/schedule-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.