The Water Supply (Water Quality) (Amendment) Regulations (Northern Ireland) 2015 (revoked)

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

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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 monitoring

Item	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 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.
(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

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Table 3:

Annual Sampling Frequencies: Treatment Works or Supply Points

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).
(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

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Schedule 5 Monitoring for indicative dose and analytical performance characteristics.

1

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