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The Water Supply (Water Quality) Regulations (Northern Ireland) 2017

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1.—(1) A monitoring programme established under Part 4 of these Regulations must—

(a)verify that—

(i)the measures in place to control risks to human health throughout the water supply chain (from the catchment area through abstraction, treatment and storage to distribution) are working effectively; and

(ii)water at the point of compliance is wholesome;

(b)provide information on the quality of water supplied to—

(i)demonstrate whether or not the water complies with prescribed concentrations and values for parameters in Schedule 1;

(ii)determine the organoleptic and microbiological quality of the water; and

(iii)establish the effectiveness of the treatment of the water, particularly of disinfection where it is used.

(c)identify the most appropriate means of mitigating any risk to human health; and

(d)have regard to Part 5.

(2) A monitoring programme must consist of either—

(a)the collection and analysis of discrete water samples; or

(b)measurement recorded by a continuous monitoring process; or

(c)a combination of both of the methods described in sub-paragraphs (a) and (b).

(3) In addition, monitoring programmes may consist of—

(a)inspections of records of the functionality and maintenance status of equipment; and/or

(b)inspections of the catchment area, water abstraction, treatment, storage and distribution infrastructure.

(4) The monitoring programme may be based on a risk assessment as set out in regulation 30.

(5) When choosing appropriate parameters and other micro-organisms, parasites or substances for monitoring programmes, local conditions for each water supply system must be taken into consideration.

TABLE 1

PARAMETERS AND CIRCUMSTANCES FOR GROUP A MONITORING

(1) Item(2) Parameter(3) Circumstances
(1)

A supply which consists of both groundwater and surface water is deemed to be a supply which consists only of surface water.

1AluminiumIf used as water treatment chemicals or where the water originates from, or is influenced by, surface waters
2AmmoniumWhere chloramination is practised
3Coliform bacteriaIn all supplies
4Colony CountsIn all supplies
5ColourIn all supplies
6ConductivityIn all supplies
7Disinfectant residualWhen disinfection treatment is practised
8Escherichia coli (E. coli)In all supplies
9Indicative DoseWhere there is treatment in place to reduce the level of radionuclides in water intended for human consumption.
10Iron(1)If used as water treatment chemicals or where the water originates from, or is influenced by, surface waters
11Manganese(1)Where the water originates from, or is influenced by, surface waters
12NitrateWhere chloramination is practised
13NitriteWhere chloramination is practised
14OdourIn all supplies
15pH (Hydrogen ion)In all supplies
16RadonWhere there is treatment in place to reduce the level of radionuclides in water intended for human consumption.
17TasteIn all supplies
18TritiumWhere there is treatment in place to reduce the level of radionuclides in water intended for human consumption.
19TurbidityIn all supplies

TABLE 2

Annual Sampling Frequencies: Water Supply Zones

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).

(1) Substances and parameters subject to monitoring(2) Estimated population of water supply zone(1)(3) Number of samples per year
(1)

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.

(2)

Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (5) and (6) below.

(3)

Group A monitoring in water supply zones is required only where chloramination is practised. In other circumstances Group B monitoring is required.

(4)

Group B monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, Group B 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.

Group A monitoring

Escherichia coli (E. coli)

< 100

≥ 100

4

12 per 5,000 population(1)

Coliform bacteria

Residual disinfectant

Aluminium

<100

100–4,999

5,000–9,999

10,000–29,999

30,000–49,999

50,000–79,999

80,000–100,000

2

4

12

24

36

52

76

Ammonium

Colony counts

Colour

Conductivity(2)

Hydrogen ion

Iron

Manganese

Nitrate(3)

Nitrite(3)

Odour

Taste

Turbidity
Group B monitoring
Aluminium

<100

100–4,999

5,000–100,000

1

4

8

Antimony
Arsenic
Benzene(2)
Benzo(a)pyrene
Boron(2)
Bromate(4)
Cadmium
Chromium
Clostridium perfringens (including spores)
Copper
Cyanide(2)
1,2 dichloroethane(2)
Enterococci
Fluoride(2)
Gross alpha(2) (5)
Gross beta(2) (5)
Iron
Lead
Manganese
Mercury(2)
Nickel
Nitrate(3)
Nitrite(3)

Pesticides and related

products(2)

Polycyclic aromatic hydrocarbons
Radon(2) (6)
Selenium
Sodium

Trichloroethene/

Tetrachloroethene(2)

Tetrachloromethane(2)
Trihalomethanes
Chloride(2)
Sulphate(2)
Total organic carbon(2)
Tritium(2)

TABLE 3

Annual Sampling Frequencies: Treatment Works or Supply Points

Sampling is at treatment works for the substances and parameters shown in column (1) of the Table as items (1) to (6) and at supply points for the other substances and parameters, except nitrite subject to notes 2 and 3 to the Table below.

This table sets out the annual sampling frequencies for all 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).

(1) Item(2) Substances and parameters(3) Volume of water supplied m3/d(1)(4) Number of samples per year(2)
(1)

The water undertaker may use the number of inhabitants in a supply zone instead of the volume of water to determine the minimum frequency, assuming a water consumption of 200 l/day/capita.

(2)

The volumes are calculated as averages taken over a calendar year.

(3)

Sampling at treatment works when chloramination is practised.

(4)

Sampling at treatment works when chloramination is not practised.

(5)

Group B monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, Group B monitoring is required in water supply zones

(6)

To monitor for indicative dose (for radioactivity).

1Escherichia coli (E. coli)

<20

20-1,999

2,000-5,999

6,000-11,999

≥ 12,000

4

52

104

208

365

2Coliform bacteria
3Colony counts
4Nitrite(3)
5Residual disinfectant
6Turbidity
Group A monitoring
7Conductivity

<20

20-999

1,000-1,999

2,000-5,999

6,000-9,999

10,000-15,999

16,000-32,999

33,000-49,999

50,000-67,999

68,000-84,999

85,000-101,999

102,000-119,999

120,000-241,999

242,000-484,999

485,000-728,999

2

4

12

24

36

52

104

156

208

260

312

365

730

1,460

2,190

Group A monitoring
8

Gross alpha(6)

<20

20-999

1,000-49,999

50,000-89,999

90,000-299,999

300,000-649,999

≥ 650,000

1

4

8

12

24

36

48

9

Gross beta(6)

10

Radon

11Tritium
Group B monitoring
12Benzene

<20

20-999

1,000-49,999

50,000-89,999

90,000-299,999

300,000-649,999

≥650,000

1

4

8

12

24

36

48

13Boron
14Bromate(5)
15Clostridium perfringens (including spores)
16Cyanide
171,2,dichloroethane
18Fluoride
19Mercury
20Nitrite(4)
21Pesticides and related products
22

Trichloroethene/

Tetrachloroethene

23Tetrachloromethane
24Chloride
25Sulphate
26Total Organic Carbon
27Radon
28Tritium
29Gross alpha(6)
30Gross beta(6)

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