
2015 No. 363
Water And Sewerage
The Water Supply (Water Quality) (Amendment) Regulations (Northern Ireland) 2015  (revoked)
Made 29th October 2015
Coming into operation 28th November 2015
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Citation, commencement and interpretation
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Amendments to the principal Regulations
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Amendments to secondary Regulations
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SCHEDULE 1

Regulations 2(12)
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Table in Schedule 2 of the Water Supply (Water Quality) Regulations (Northern Ireland) 2007 (indicator parameters)

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SCHEDULE 2

Regulation 2(13)
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Tables 1-3 in Schedule 3 of the Water Supply (Water Quality) Regulations (Northern Ireland) 2007

Table 1:
Parameters and circumstances for check monitoringItem Parameter Circumstances
1 Aluminium When used as a flocculant or where the water originates from, or is influenced by, surface waters.
2 Ammonium 
3 Clostridium pefringens (including spores) Where the water originates from, or is influenced by, surface waters.
4 Coliform bacteria 
5 Colony Counts 
6 Colour 
7 Conductivity 
8 Escherichia coli (E.coli) 
9 Hydrogen ion 
10 Indicative Dose Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken.
11 Iron When used as a flocculant or where the water originates from, or is influenced by, surface waters.
12 Manganese Where the water originates from, or is influenced by, surface waters.
13 Nitrate When chloramination is practised
14 Nitrite When chloramination is practised
15 Odour 
16 Radon Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken.
17 Taste 
18 Tritium Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken.
19 Turbidity 

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Table 2
Annual Sampling Frequencies: Water Supply Zones(1)Substances and parameters subject to monitoring (2)Estimated population of water supply zone (3)Reduced (4)Standard
Subject to check monitoring
E.coli <100  4
Coliform bacteria ≥100  12 per 5,000 population2
Residual disinfectant   
Aluminium <100 1 2
Ammonium 100-4,999 2 4

Clostridium perfringens
(including spores)1
 5,000-9,999 6 12
Colony Counts 10,000-29,999 12 24
Colour 30,000-49,999 18 36
Conductivity1 50,000-79,999 26 52
Hydrogen ion 80,000-100,000 38 76
Iron   
Manganese   
Nitrate3   
Nitrite3   
Odour   
Taste   
Turbidity   
Subject to audit monitoring
Aluminium <100  1
Antimony 100-4,999  4
Arsenic 5,000-100,000  8
Benzene1   
Benzo(a)pyrene   
Boron1   
Bromate4   
Cadmium   
Chromium   

Clostridium perfringens
(including spores)
   
Copper   
Cyanide1   
1,2, dichloroethane1   
Enterococci   
Fluoride1   
Gross Alpha156   
Gross Beta156   
Iron   
Lead   
Manganese   
Mercury1   
Nickel   
Nitrate3   
Nitrite3   
Pesticides and related products1   
Polycyclic aromatic hydrocarbons   
Radon1   
Selenium   
Sodium   
Trichloroethene/ Tetrachloroethene1   
Tetrachloromethane1   
Trihalomethanes   
Chloride1   
Sulphate1   
Total Organic carbon1   
Tritium1   
1 Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and below (iii) below.
2 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.
3 Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required.
4 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.
5 To monitor for indicative dose (for radioactivity).
6 In the event that a single sample is taken in a year, a further sample should be taken if there is any change in relation to that supply that could affect the concentration of radionuclides in the water supply.

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Table 3:
Annual Sampling Frequencies: Treatment Works or Supply Points(1)Item (2)Substances and parameters (3) Volume of water supplied m3/d (4)Reduced (5)Standard
1 E.coli <20 - 4
2 Coliform bacteria 20-1,999 12 52
3 Colony counts 2,000-5,999 52 104
4 Nitrite2 6,000-11,999 104 208
5 Residual disinfectant ≥ 12,000 104 365
6 Turbidity   
Subject to check monitoring
7 Clostridium perfringens1 <20 - 2
8 Conductivity 20-999 2 4
  1,000-1,999 6 12
  2,000-5,999 12 24
  6,000-9,999 18 36
  10,000-15,999 26 52
  16,000-32,999 52 104
  33,000-49,999 78 156
  50,000-67,999 104 208
  68,000-84,999 130 260
  85,000-101,999 156 312
  102,000-119,999 183 365
  120,000-241,999 365 730
  242,000-484,999 730 1,460
  485,000-728,999 1,095 2,190
8A Indicative Dose (for radioactivity) <20  1
8B Gross alpha5 20-999  4
8C Gross beta5 1,000-49,999  8
8D Radon 50,000-89,999  12
8E Tritium 90,000-299,999  24
  300,000-649,999  36
  ≥ 650,000  48
Subject to audit monitoring
9 Benzene <20  1
10 Boron 20-999  4
11 Bromate4 1,000-49,999  8
11A Clostridium perfringens (including spores) 50,000-89,999  12
12 Cyanide 90,000-299,999  24
13 1,2,dichloroethane 300,000-649,999  36
14 Fluoride ≥ 650,000  48
15 Mercury   
16 Nitrite3   
17 Pesticides and related products   
18 
Trichloroethene/
Tetrachloroethene
   
19 Tetrachloromethane   
20 Chloride   
21 Sulphate   
22 Total Organic Carbon   
22a Radon   
23 Tritium   
24 Indicative Dose (for radioactivity)   
25 Gross alpha5   
26 Gross beta5   
1 Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3)
2 Sampling at treatment works when chloramination is practised.
3 Sampling at treatment works when chloramination is not practised.
4 Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones.
5 To monitor for indicative dose (for radioactivity).”
SCHEDULE 3

Regulation 2(14)
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Schedule 5 Monitoring for indicative dose and analytical performance characteristics.
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