# The Public Water Supplies (Scotland) Amendment Regulations 2022, Schedule 2: SUBSTITUTION OF TABLE C IN SCHEDULE 1 OF THE 2014 REGULATIONS


“
TABLE C
Indicator Parameters
(1)
(2)
(3)
(4)
(5)
(6)
Item
Parameter
Concentration or value (maximum) or state
Units of measurement
Point of monitoring
Notes
Notes—
Note 1: Water must not be aggressive or corrosive. This applies particularly to water undergoing treatment (demineralisation, softening, membrane treatment, reverse osmosis, etc.).
Note 2: Where water intended for human consumption is derived from treatment that significantly demineralises or softens water, calcium and magnesium salts could be added to condition the water in order to reduce any possible negative health impact, as well as to reduce the corrosiveness or aggressivity of water and to improve taste. Minimum concentrations of calcium and magnesium or total dissolved solids in softened or demineralised water could be established taking into account the characteristics of water that enters those processes.
Note 3: The water must not be corrosive.
Note 4: This parameter must be measured if a risk assessment under regulation 30(2) indicates that it is appropriate to do so.
Note 5: For water put into bottles or containers (which is not intended for sale for drinking by humans), the unit is number/250ml.
Note 6: The water must not be aggressive.
Note 7: For water put into bottles or containers (which is not intended for sale for drinking by humans), the minimum value is 4.5 pH units.
Note 8: This parameter need not be measured for supplies of less than 10,000 m³ a day.
Note 9: Remedial action is to be deemed justified on radiological protection grounds, without further consideration where radon concentrations exceed 1,000 Bq/l.
Note 10: If the concentration of tritium exceeds this value, an analysis of the presence of other artificial radionuclides must also be carried out by Scottish Water.
Part 1
1.
Ammonium
0.50
mgNH4/1
Consumer’s tap
2.
Chloride
250
mgCl/1
Supply point
Note 3
3.
Clostridium perfringens (including spores)
0
Number/100ml
Supply point
Note 4
4.
Coliform bacteria
0
Number/100ml
Consumer’s tap
Note 5
5.
Colony count
No abnormal change
Number/1ml at 22°C
Consumer’s tap, service reservoir and treatment works
6.
Colour
Acceptable to consumers and no abnormal change
Consumer’s tap
7.
Conductivity
2500
μS/cm at 20°C
Supply point
Note 6
8.
Hydrogen ion
9.5
pH value
Consumer’s tap
Notes 6 and 7
6.5 (minimum)
9.
Odour
Acceptable to consumers and no abnormal change
Consumer’s tap
10.
Sulphate
250
mgSO4/l
Supply point
Note 3
11.
Taste
Acceptable to consumers and no abnormal change
Consumer’s tap
12.
Total organic carbon
No abnormal change
mgC/1
Supply point
Note 8
13.
Turbidity
1
NTU
Treatment works
Part 2
14.
Indicative dose
0.10
mSv
Supply point
15.
Radon
100
Bq/l
Supply point
Note 9
16.
Tritium
100
Bq/l
Supply point
Note 10
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Source: https://www.legislation.gov.uk/sdsi/2022/9780111055663/schedule/2 (the official version)
Page: https://openlegislation.uk/draft-public-water-supplies-scotland-amendment-regulations-2022/schedule-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.