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

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Regulations 2(12)

SCHEDULE 1

This schedule has no associated Explanatory Memorandum

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

ItemParametersSpecification concentration or Value (maximum unless otherwise stated) or StateUnits of MeasurementPoint of Monitoring
(*)

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

(i)

The water should not be aggressive.

(ii)

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

(iii)

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

(iv)

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 shall be required.

(v)

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.

(vi)

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

1Ammonium0.50mgNH4/lConsumers’ taps
2Chloride(i)250mgCl/lSupply point(*)
3Clostridium Perfringens (including spores)0Number/100mlSupply point(*)
4Coliform bacteria0Number/100mlConsumers’ taps
5Colony countsNo abnormal change

Number/1ml at 22oC

Number/1ml at 37oC

Consumers’ taps, service reservoirs and treatment works
6Conductivity(i)2500µS/cm at 20 oCSupply point(*)
7Hydrogen ion(i)

9.5

6.5 (minimum)

pH valueConsumers’ taps
8Radon (for radioactivity)(ii) (v)100Bq/lSupply point(*)
9Sulphate (i)250mgSO4/lSupply point(*)
10Indicative dose (for radioactivity)(iii) (v) (vi)

0.10

mSvSupply point(*)
11Total organic carbon (TOC)No abnormal changemgC/lSupply point(*)
12Tritium (for radioactivity)(iv) (v)100Bq/lSupply point(*)
13Turbidity1NTUTreatment works

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