SCHEDULE 3MONITORING
Part 1Group A and Group B Parameters
Words in Sch. 3 Pt. 1 Table 3 substituted (28.3.2019) by The Rural Affairs, Environment, Fisheries and Food (Miscellaneous Amendments and Revocations) (Wales) Regulations 2019 (S.I. 2019/463), regs. 1(3), 30(3)(b)
Words in Sch. 3 Pt. 1 Table 3 substituted (28.3.2019) by The Rural Affairs, Environment, Fisheries and Food (Miscellaneous Amendments and Revocations) (Wales) Regulations 2019 (S.I. 2019/463), regs. 1(3), 30(3)(c)
Words in Sch. 3 Pt. 1 Table 3 substituted (28.3.2019) by The Rural Affairs, Environment, Fisheries and Food (Miscellaneous Amendments and Revocations) (Wales) Regulations 2019 (S.I. 2019/463), regs. 1(3), 30(3)(d)
Words in Sch. 3 Pt. 1 Table 3 omitted (28.3.2019) by virtue of The Rural Affairs, Environment, Fisheries and Food (Miscellaneous Amendments and Revocations) (Wales) Regulations 2019 (S.I. 2019/463), regs. 1(3), 30(3)(e)
Item number (1) | Parameter (2) | Circumstances (3) |
|---|---|---|
1 | Aluminium | Where used as a water treatment chemical or where the water originates from, or is influenced by, surface waters |
2 | Ammonium | Where chloramination is practised |
3 | Coliform bacteria | In all circumstances |
4 | Colony counts 22 ° C | In all circumstances |
5 | Colour | In all circumstances |
6 | Conductivity1 | In all circumstances |
7 | E. coli | In all circumstances |
8 | Hydrogen ion | In all circumstances |
9 | Iron | Where used as a water treatment chemical or where the water originates from, or is influenced by, surface waters |
10 | Manganese | Where the water originates from, or is influenced by, surface waters |
11 | Nitrate | Where chloramination is practised |
12 | Nitrite | Where chloramination is practised |
13 | Odour | In all circumstances |
14 | Residual disinfectant | In all circumstances |
15 | Taste | In all circumstances |
16 | Turbidity | In all circumstances |
Note: | ||
1 Sampling for this parameter in water supply zones may be substituted by sampling at supply points. | ||
Item number | Parameter (2) | Circumstances |
|---|---|---|
1 | Aluminium | Where— (i) not used as a water treatment chemical; or (ii) the water neither originates from, nor is influenced by, surface waters. |
2 | Ammonium | Where chloramination is not practised |
3 | Antimony | In all circumstances |
4 | Arsenic | In all circumstances |
5 | Benzene 1 | In all circumstances |
6 | Benzo(a)pyrene | In all circumstances |
7 | Boron 1 | In all circumstances |
8 | Bromate 2 | In all circumstances |
9 | Cadmium | In all circumstances |
10 | Chloride 1 | In all circumstances |
11 | Chromium | In all circumstances |
12 | Clostridium perfringens (including spores) | In all circumstances |
13 | Copper | In all circumstances |
14 | Cyanide 1 | In all circumstances |
15 | 1, 2 dichloroethane 1 | In all circumstances |
16 | Enterococci | In all circumstances |
17 | Fluoride 1 | In all circumstances |
18 | Gross alpha 134 | In all circumstances |
19 | Gross beta 134 | In all circumstances |
20 | Iron | Where— (i) not used as a flocculant; or (ii) the water neither originates from, nor is influenced by, surface waters. |
21 | Lead | In all circumstances |
22 | Manganese | Where the water neither originates from, nor is influenced by, surface waters. |
23 | Mercury 1 | In all circumstances |
24 | Nickel | In all circumstances |
25 | Nitrate | Where chloramination is not practised. |
26 | Nitrite | Where chloramination is not practised. |
27 | Pesticides and related products 1 | In all circumstances |
28 | Polycyclic aromatic hydrocarbon | In all circumstances |
29 | Radon 14 | In all circumstances |
30 | Selenium | In all circumstances |
31 | Sodium | In all circumstances |
32 | Sulphate 1 | In all circumstances |
33 | Tetrachloroethene 1 | In all circumstances |
34 | Tetrachloromethane 1 | In all circumstances |
Total organic carbon 1 | ||
35 | Trichloroethene | In all circumstances |
Trihalomethanes: Total | ||
36 | Tritium 14 | In all circumstances |
Notes: | ||
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 number | Parameter 2 | Circumstances |
|---|---|---|
1 | Benzene 1 | In all circumstances |
2 | Boron 1 | In all circumstances |
3 | Bromate 2 | In all circumstances |
4 | Chloride 1 | In all circumstances |
5 | F2Colstridium perfringens (including spores)(1) | In all circumstances |
6 | Cyanide 1 | In all circumstances |
7 | 1, 2 dichloroethane 1 | In all circumstances |
8 | Fluoride 1 | In all circumstances |
9 | Gross alpha 134 | In all circumstances |
10 | Gross beta 134 | In all circumstances |
11 | F3Indicative dose (1) | In all circumstances |
12 | Mercury 1 | In all circumstances |
13 | Nitrite | When chloramination is not practised. |
14 | Pesticides and related products 1 | In all circumstances |
15 | Radon 14 | In all circumstances |
16 | Sulphate 1 | In all circumstances |
17 | F4Tetrachloroethene/Trichloroethene(1) | In all circumstances |
18 | Tetrachloromethane 1 | In all circumstances |
19 | Total organic carbon 1 | |
20 | F5. . . | F5. . . |
21 | Tritium 14 | In all circumstances |
Notes: | ||
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 number | Parameter |
|---|---|
1 | Coliform bacteria |
2 | E. coli |
3 | Residual disinfectant |
Item number | Parameter |
|---|---|
1 | Coliform bacteria |
2 | Colony counts 22° C |
3 | E.coli |
4 | Nitrite |
5 | Residual disinfectant |
6 | Turbidity |
Item number | Parameter |
|---|---|
1 | Conductivity |
Item number | Parameter |
|---|---|
1 | Aluminium |
2 | Ammonium |
3 | Colony counts 22° C |
4 | Colour |
5 | Conductivity |
6 | Hydrogen ion |
7 | Iron |
8 | Manganese |
9 | Nitrate |
10 | Nitrite |
11 | Odour |
12 | Taste |
13 | Turbidity |
PART 2Annual sampling frequencies: water supply zones
Table 8
Annual sampling frequencies for Group A4 parameters: water supply zones
Note:
This table and each table which follows it in this Part set out the annual sampling frequencies for all the substances and parameters comprising each of the groups to which they correspond, those groups having been outlined in Part 1 of this Schedule. These are determined for each water supply zone according to its estimated population (as specified in column one of each table in this Part). The number of samples to be taken is the standard number specified in column 2, unless a notice varying this number has been given under regulation 9.
Estimated population of water supply zone | Standard sampling frequency per year |
|---|---|
<100 | 2 |
100-4,999 | 4 |
5,000—9,999 | 12 |
10,000-29,999 | 24 |
30,000-49,999 | 36 |
50,000-79,999 | 52 |
80,000-100,000 | 76 |
Estimated population of water supply zone | Standard sampling frequency per year |
|---|---|
<100 | 1 |
100-4,999 | 4 |
5,000-100,000 | 8 |
Estimated population of water supply zone | Standard sampling frequency per year |
|---|---|
<100 | 4 |
≥100 | 12 per 5,000 population |
Note:
For the purposes of this Table, where the population is not an exact multiple of 5,000, the population figure must be rounded up to the nearest multiple of 5,000.
PART 3Annual sampling frequencies: treatment works and supply points
Table 11
Annual sampling frequencies for Group A2 parameters: treatment works or supply points
Note: This table and each table which follows it in this Part set out the annual sampling frequencies for all the substances and parameters comprising each of the groups to which they correspond at treatment works or supply points, those groups having been outlined in Part 1 of this Schedule. The frequencies are determined according to the volume of water supplied at each treatment works or supply point. The number of samples to be taken is the standard number specified in column 2, unless a notice varying this number has been issued under regulation 9.
Volume of water supplied m 3/day | Standard sampling frequency per year |
|---|---|
<20 | 4 |
20-1,999 | 52 |
2,000-5,999 | 104 |
6,000-11,999 | 208 |
≥12,000 | 365 |
Volume of water supplied m 3/day | Standard sampling frequency per year |
|---|---|
<20 | 2 |
20-999 | 4 |
1,000-1999 | 12 |
2,000-5,999 | 24 |
6,000-9,999 | 36 |
10,000-15,999 | 52 |
16,000-32,999 | 104 |
33,000-49,999 | 156 |
50,000-67,999 | 208 |
68,000-84,999 | 260 |
85,000-101,999 | 312 |
102,000-119,999 | 365 |
120,000-241,999 | 730 |
242,000-484,999 | 1,460 |
485,000-728,999 | 2,190 |
Volume of water supplied m 3/day | Standard sampling frequency per year |
|---|---|
<20 | 1 |
20-999 | 4 |
1,000-49,999 | 8 |
50,000-89,999 | 12 |
90,000-299,999 | 24 |
300,000-649,999 | 36 |
≥650,000 | 48 |
Words in Sch. 3 Pt. 1 Table 3 heading substituted (28.3.2019) by The Rural Affairs, Environment, Fisheries and Food (Miscellaneous Amendments and Revocations) (Wales) Regulations 2019 (S.I. 2019/463), regs. 1(3), 30(3)(a)