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The Private Water Supplies (Amendment) Regulations (Northern Ireland) 2015

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Amendment of Schedule 1 Concentrations and Values

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7.  For Schedule 1 Part 2 (Indicator Parameters) substitute—

PART 2Indicator Parameters

ParametersMaximum concentration or value or state (unless otherwise stated)Units of measurement
(1)

The water should not be aggressive.

(2)

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

(3)

Where treatment to reduce the level of radionuclides in water intended for human consumption has being taken, monitoring must be carried out under Schedule 3 Part 1 to ensure the continued efficacy of treatment.

(4)

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

(5)

Remedial action is deemed to be justified on radiological protection grounds, without further consideration, where radon concentrations exceed 1000Bq/l.

(6)

If tritium concentration exceeds its parametric value an investigation (which may include analysis) of the presence of other artificial radionuclides must be carried out.

(7)

Only in the case of surface water treatment where the parametric value should be strived for the water ex-treatment works.

Ammonium0.50mgNH4/l
Chloride(1)250mgCl/l
Clostridium perfringens (including spores)0Number/100ml
Coliform bacteria0Number/100ml
Colony counts

No abnormal change

No abnormal change

Number/1ml at 22oC

Number/1ml at 37oC

Conductivity(1)2,500µS/cm at 20oC
Hydrogen ion(1)

9.5

6.5 (minimum)

pH value

pH value

Sulphate(1)250mgSO4/l
Indicative dose (for radioactivity)(2) (3) (4)0.10mSv/year
Radon (for radioactivity)(3) (5)100Bq/1
Total organic carbon(TOC)No abnormal changemgC/l
Tritium (for radioactivity)(3) (6)100Bq/l
Turbidity(7)1NTU

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