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

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Regulation 2 and 5

SCHEDULE 2INDICATOR PARAMETERS

This schedule has no associated Explanatory Memorandum
(1) Item(2) Parameters(3) Specification Concentration or Value (maximum unless otherwise stated) or State(4) Units of Measurement(5) Point of monitoring
(1)

May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.

(2)

The water should not be aggressive.

(3)

Where radon concentrations exceed 1000Bq/l, remedial action must be carried out on radiological protection grounds without further consideration.

(4)

Excluding tritium, potassium-40, radon and radon decay products.

(5)

Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, an analysis of the presence of other radionuclides is required.

(6)

Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out to ensure the continued efficacy of the treatment.

(7)

If the gross alpha activity exceeds 0.1Bq/l or gross beta activity exceeds 1.0Bq/l, analysis for specific radionuclides is required.

1Ammonium0.50mg/lConsumers’ taps
2Chloride(1) (2)250mg/lSupply point
3Clostridium perfringens (including spores)(1)0Number/100mlSupply point
4Coliform bacteria0Number/100mlConsumers’ taps
5Colony countsNo abnormal changeNumber/1ml at 22°C Number/1ml at 37°CConsumers’ taps, service reservoirs and treatment works
6Conductivity(1) (2)2500µS/cm at 20°CSupply point
7Hydrogen ion(2)9.5pH unitsConsumers’ taps
6.5 (minimum)
8Radon (for radioactivity)(1) (3) (6)100Bq/lSupply point
9Sulphate(1) (2)250mg/lSupply point
10Indicative dose (for radioactivity)(1) (4) (6) (7)0.10mSvSupply point
11Total organic carbon (TOC)(1)No abnormal changemg/lSupply point
12Tritium (for radioactivity)(1) (5) (6)100Bq/lSupply point
13Turbidity1NTUTreatment works

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