The Water Supply (Water Quality) Regulations 2018

Part 1E+WGroup A and Group B Parameters

Table 1

Group A parameters and circumstances for monitoring

1 Sampling for this parameter in water supply zones may be substituted by sampling at supply points.

Item number (1)Parameter (2)Circumstances (3)
1AluminiumWhere used as a water treatment chemical or where the water originates from, or is influenced by, surface waters
2AmmoniumWhere chloramination is practised
3Coliform bacteriaIn all circumstances
4Colony counts 22 ° CIn all circumstances
5ColourIn all circumstances
6Conductivity1In all circumstances
7E. coliIn all circumstances
8Hydrogen ionIn all circumstances
9IronWhere used as a water treatment chemical or where the water originates from, or is influenced by, surface waters
10ManganeseWhere the water originates from, or is influenced by, surface waters
11NitrateWhere chloramination is practised
12NitriteWhere chloramination is practised
13OdourIn all circumstances
14Residual disinfectantIn all circumstances
15TasteIn all circumstances
16TurbidityIn all circumstances
Note:

Table 2

Group B1 parameters and circumstances for monitoring to be used for sampling in water supply zones (or supply points)

1 Sampling for these parameters may be within water supply zones (Group B1) or at supply points (Group B2).

2 Monitoring of this parameter in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, monitoring is required at supply points, see Group B2.

3 To monitor for indicative dose.

4 In the event that a single sample is taken in a year, a further sample must be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply.

Item numberParameter (2)Circumstances
1Aluminium

Where—

(i) not used as a water treatment chemical; or

(ii) the water neither originates from, nor is influenced by, surface waters.

2AmmoniumWhere chloramination is not practised
3AntimonyIn all circumstances
4ArsenicIn all circumstances
5Benzene 1In all circumstances
6Benzo(a)pyreneIn all circumstances
7Boron 1In all circumstances
8Bromate 2In all circumstances
9CadmiumIn all circumstances
10Chloride 1In all circumstances
11ChromiumIn all circumstances
12Clostridium perfringens (including spores)In all circumstances
13CopperIn all circumstances
14Cyanide 1In all circumstances
151, 2 dichloroethane 1In all circumstances
16EnterococciIn all circumstances
17Fluoride 1In all circumstances
18Gross alpha 134In all circumstances
19Gross beta 134In all circumstances
20Iron

Where—

(i) not used as a flocculant; or

(ii) the water neither originates from, nor is influenced by, surface waters.

21LeadIn all circumstances
22ManganeseWhere the water neither originates from, nor is influenced by, surface waters.
23Mercury 1In all circumstances
24NickelIn all circumstances
25NitrateWhere chloramination is not practised.
26NitriteWhere chloramination is not practised.
27Pesticides and related products 1In all circumstances
28Polycyclic aromatic hydrocarbonIn all circumstances
29Radon 14In all circumstances
30SeleniumIn all circumstances
31SodiumIn all circumstances
32Sulphate 1In all circumstances
33Tetrachloroethene 1In all circumstances
34Tetrachloromethane 1In all circumstances
Total organic carbon 1
35TrichloroetheneIn all circumstances
Trihalomethanes: Total
36Tritium 14In all circumstances
Notes:

Table 3

Group B2 parameters and circumstances for monitoring to be used for sampling at works or [F1in water supply zones (or supply points)]

1 Sampling for these parameters may be within water supply zones (Group B1) or at supply points (Group B2).

2 Monitoring is required at supply points where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, see Group B1.

3 To monitor for indicative dose.

4 In the event that a single sample is taken in a year, a further sample must be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply.

Item numberParameter 2Circumstances
1Benzene 1In all circumstances
2Boron 1In all circumstances
3Bromate 2In all circumstances
4Chloride 1In all circumstances
5 [F2Colstridium perfringens (including spores)(1)]In all circumstances
6Cyanide 1In all circumstances
71, 2 dichloroethane 1In all circumstances
8Fluoride 1In all circumstances
9Gross alpha 134In all circumstances
10Gross beta 134In all circumstances
11 [F3Indicative dose (1)]In all circumstances
12Mercury 1In all circumstances
13NitriteWhen chloramination is not practised.
14Pesticides and related products 1In all circumstances
15Radon 14In all circumstances
16Sulphate 1In all circumstances
17 [F4Tetrachloroethene/Trichloroethene(1)]In all circumstances
18Tetrachloromethane 1In all circumstances
19Total organic carbon 1
20F5. . .F5. . .
21Tritium 14In all circumstances
Notes:

Table 4

Group A1 parameters

Item numberParameter
1Coliform bacteria
2E. coli
3Residual disinfectant

Table 5

Group A2 parameters

Item numberParameter
1Coliform bacteria
2Colony counts 22° C
3E.coli
4Nitrite
5Residual disinfectant
6Turbidity

Table 6

Group A3 parameters

Item numberParameter
1Conductivity

Table 7

Group A4 parameters

Item numberParameter
1Aluminium
2Ammonium
3Colony counts 22° C
4Colour
5Conductivity
6Hydrogen ion
7Iron
8Manganese
9Nitrate
10Nitrite
11Odour
12Taste
13Turbidity