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

Regulation 2(13)

SCHEDULE 2

“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

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
(*) 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.
(i) 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.
(ii) Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required.
(iii) 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.
(iv) To monitor for indicative dose (for radioactivity).
(v) 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.
Note: This table sets out the annual sampling frequencies for all the substances and parameters in column 1. These are determined for each water supply zone according to its estimated population (column 2). The number of samples is either the standard number in column 4 or the reduced number in column 3 (if one is given). Regulation 9 provides for the circumstances in which the reduced number of samples may be taken.
Subject to check monitoring
E.coli	<100		4
Coliform bacteria	≥100		12 per 5,000 population(i)
Residual disinfectant
Aluminium	<100	1	2
Ammonium	100-4,999	2	4
Clostridium perfringens (including spores)(*)	5,000-9,999	6	12
Colony Counts	10,000-29,999	12	24
Colour	30,000-49,999	18	36
Conductivity(*)	50,000-79,999	26	52
Hydrogen ion	80,000-100,000	38	76
Iron
Manganese
Nitrate(ii)
Nitrite(ii)
Odour
Taste
Turbidity
Subject to audit monitoring
Aluminium	<100		1
Antimony	100-4,999		4
Arsenic	5,000-100,000		8
Benzene(*)
Benzo(a)pyrene
Boron(*)
Bromate(iii)
Cadmium
Chromium
Clostridium perfringens (including spores)
Copper
Cyanide(*)
1,2, dichloroethane(*)
Enterococci
Fluoride(*)
Gross Alpha(*) (iv) (v)
Gross Beta(*) (iv) (v)
Iron
Lead
Manganese
Mercury(*)
Nickel
Nitrate(ii)
Nitrite(ii)
Pesticides and related products(*)
Polycyclic aromatic hydrocarbons
Radon(*)
Selenium
Sodium
Trichloroethene/ Tetrachloroethene(*)
Tetrachloromethane(*)
Trihalomethanes
Chloride(*)
Sulphate(*)
Total Organic carbon(*)
Tritium(*)

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
(i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3)
(ii) Sampling at treatment works when chloramination is practised.
(iia) Sampling at treatment works when chloramination is not practised.
(iii) 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.
(iv) To monitor for indicative dose (for radioactivity).
Note 1: Sampling is at treatment works for the substances and parameters shown in column (1) of Table 3 as items (1) to (6) and at supply points for the other substances and parameters, except nitrite subject to footnotes (ii) and (ii)(a) to the Table below.
Note 2: Table 3 sets out the annual sampling frequencies for all of the substances and parameters in column 2 at treatment works or supply points. The frequencies are determined according to the volume of water supplied at each treatment works or supply point (column 3). The number of samples is either the standard number in column 5 or the reduced number in column 4 (if one is given). Regulation 9 provides for the circumstances in which the reduced number of samples may be taken.”
1	E.coli	<20	-	4
2	Coliform bacteria	20-1,999	12	52
3	Colony counts	2,000-5,999	52	104
4	Nitrite(ii)	6,000-11,999	104	208
5	Residual disinfectant	≥ 12,000	104	365
6	Turbidity
Subject to check monitoring
7	Clostridium perfringens(i)	<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 alpha(iv)	20-999		4
8C	Gross beta(iv)	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	Bromate(iii)	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	Nitrite(iia)
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 alpha(iv)
26	Gross beta(iv)