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The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017

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PART CIndicator parameters

ParameterParametric valueUnitNotes
Aluminium200μg/l
Ammonium0.50mg/l
Chloride250mg/lNote 1

Clostridium perfringens

(including spores)

0number/100 ml
ColourAcceptable to consumers and no abnormal change
Colour20mg/l Pt/Co
Conductivity2500μS/cm at 20 °CNote 1
Hydrogen ion concentration≥ 6.5 and ≤ 9.5pH unitsNotes 1 and 3
Iron200μg/lNote 2
Manganese50μg/lNote 2
OdourAcceptable to consumers and no abnormal change
Oxidisability5.0mg/l O2Note 4
Sulphate250mg/lNote 1
Sodium200mg/l
TasteAcceptable to consumers and no abnormal change
Colony count 22 °CNo abnormal change
Coliform bacteria0number/100 mlNote 5
Total organic carbonNo abnormal changeNote 6
TurbidityAcceptable to consumers and no abnormal changeNote 7

Parametric values for radon, tritium and indicative dose—

ParameterParametric valueUnitNotes
Radon100Bq/lNote 8
Tritium100Bq/lNote 9
Indicative dose0.10mSv
Note 1: The water must not be aggressive.
Note 2: This parameter must be measured if the water originates from, or is influenced by, surface water.
Note 3: For still water put into bottles or containers, the minimum value may be reduced to 4.5 pH units. For water put into bottles or containers which is naturally rich in or artificially enriched with carbon dioxide, the minimum value may be lower.
Note 4: This parameter need not be measured if total organic carbon is analysed.
Note 5: For water put into bottles or containers the unit is number/250 ml.
Note 6: This parameter need not be measured for supplies of less than 10,000 m3 of water a day.
Note 7: If the water is subject to treatment to improve its quality, each enforcing authority in relation to the water must strive to ensure that the water, at the point at which it flows out from the treatment works, does not exceed 1.0 nephelometric turbidity units.
Note 8: Remedial action is to be deemed justified on radiological protection grounds, without further consideration, where radon concentrations exceed 1,000 Bq/l.
Note 9: Elevated levels of tritium may indicate the presence of other artificial radionuclides. If the tritium concentration exceeds its parametric value, each enforcing authority in relation to the water must also carry out an analysis of the presence of other artificial radionuclides.

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