# The Public Water Supplies (Scotland) Regulations 2014, Schedule 1: PRESCRIBED CONCENTRATIONS AND VALUES


TABLE A
MICROBIOLOGICAL PARAMETERS
(1)
Item
(2)
Parameter
(3)
Concentration or
value (maximum)
(4)
Units of
measurement
(5)
Point of
compliance
(a)The parametric values in Part 2 are not required to protect human health (since the parametric values in Part 1 are sufficient for that purpose). The values in Part 2 are not therefore set for the purposes of Article 5(3) of the Directive.
(b)Compliance required as to 95% of samples from each service reservoir (regulation 4(4)).
Part 1
1.
Enterococci
0
Number/100ml
Consumer’s tap
2.
Escherichia coli
0
Number/100ml
Consumer’s tap
Part 2
3.
Coliform bacteria
0
Number/100ml
Service reservoir
0
Number/100ml
Treatment works
4.
Escherichia coli
0
Number/100ml
Service reservoir
0
Number/100ml
Treatment works
Notes—
TABLE B
CHEMICAL PARAMETERS
(1)
Item
(2)
Parameter
(3)
Concentration or
value (maximum)
(4)
Units of
measurement
(5)
Point of
compliance
(a)The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification.
(b)See also regulation 6(6).
(c)See also regulation 4(2)(c).
(d)The corresponding parametric value applies to each ‘other pesticide’ individually.
(e)The parametric values in this Part are not required to protect human health (since the parametric values in Part 1 are sufficient for that purpose). The values in Part 2 are not therefore set for the purposes of Article 5(3) of the Directive.
Part 1
1.
Acrylamide
0.10
μg/l
Consumer’s tap
2.
Antimony
5.0
μgSb/l
Consumer’s tap
3.
Arsenic
10
μgAs/l
Consumer’s tap
4.
Benzene
1.0
μg/l
Consumer’s tap
5.
Benzo(a)pyrene
0.010
μg/l
Consumer’s tap
6.
Boron
1.0
mgB/l
Consumer’s tap
7.
Bromate
10
μgBrO3/l
Consumer’s tap
8.
Cadmium
5.0
μgCd/l
Consumer’s tap
9.
Chromium
50
μgCr/l
Consumer’s tap
10.
Copper
2.0
mgCu/l
Consumer’s tap
11.
Cyanide
50
μgCN/l
Consumer’s tap
12.
1,2-dichloroethane
3.0
μg/l
Consumer’s tap
13.
Epichlorohydrin
0.10
μg/l
Consumer’s tap
14.
Fluoride
1.5
mgF/l
Consumer’s tap
15.
Lead
10
μgPb/l
Consumer’s tap
16.
Mercury
1.0
μgHg/l
Consumer’s tap
17.
Nickel
20
μgNi/l
Consumer’s tap
18.
Nitrate
50
mgNO3/l
Consumer’s tap
19.
Nitrite
0.50
mgNO2/l
Consumer’s tap
0.10
mgNO2/l
Treatment works
20.
Pesticide—
Aldrin
0.030
μg/l
Consumer’s tap
Dieldrin
0.030
μg/l
Consumer’s tap
Heptachlor
0.030
μg/l
Consumer’s tap
Heptachlor epoxide
0.030
μg/l
Consumer’s tap
Other pesticide
0.10
μg/l
Consumer’s tap
21.
Pesticides: Total
0.50
μg/l
Consumer’s tap
22.
PAH: Total
0.10
μg/l
Consumer’s tap
23.
Selenium
10
μgSe/l
Consumer’s tap
24.
Tetrachloroethene and Trichloroethene
10
μg/l
Consumer’s tap
25.
THM: Total
100
μg/l
Consumer’s tap
26.
Vinyl chloride
0.50
μg/l
Consumer’s tap
Part 2
27.
Aluminium
200
μgAl/l
Consumer’s tap
28.
Colour
20
mg/l Pt/Co
Consumer’s tap
29.
Iron
200
μgFe/l
Consumer’s tap
30.
Manganese
50
μgMn/l
Consumer’s tap
31.
Sodium
200
mgNa/l
Consumer’s tap
32.
Tetrachloromethane
3
μg/l
Consumer’s tap
33.
Turbidity
4
NTU
Consumer’s tap
Notes—
TABLE C
INDICATOR PARAMETERS
(1)
Item
(2)
Parameter
(3)
Concentration or
value (maximum)
or state
(4)
Units of
measurement
(5)
Point of
monitoring
(a)The water should not be aggressive.
(b)In the event that the use of samples from a point within a water supply zone has not be been authorised for this parameter under regulation 8, the point of monitoring is instead the consumer’s tap.
(c)This value, in so far as the point of monitoring is a service reservoir, is not set for the purposes of Article 5(3) of the Directive.
(d)This value, in so far as the point of monitoring is a treatment works, is not set for the purposes of Article 5(3) of the Directive.
Part 1
1.
Ammonium
0.50
mgNH4/l
Consumer’s tap
2.
Chloride
250
mgCl/l
Supply point
3.
Clostridium perfringens (including spores)
0
Number/100ml
Supply point
4.
Coliform bacteria
0
Number/100ml
Consumer’s tap
5.
Colony count
No abnormal change
Number/1ml
at 22°C and
at 37°C
Consumer’s tap
Service reservoir
Treatment works
6.
Colour
Acceptable to consumers and no abnormal change
Consumer’s tap
7.
Conductivity
2500
μS/cm at 20°C
Supply point
8.
Hydrogen ion
9.5
pH value
Consumer’s tap
6.5 (minimum)
9.
Odour
Acceptable to consumers and no abnormal change
Consumer’s tap
10.
Sulphate
250
mgSO4/l
Supply point
11.
Taste
Acceptable to consumers and no abnormal change
Consumer’s tap
12.
Total organic carbon
No abnormal change
mgC/l
Supply point
13.
Turbidity
1
NTU
Treatment works
Part 2
14.
Indicative dose
0.10
mSv/year
Supply point
15.
Tritium
100
Bq/l
Supply point
Notes—
In this Schedule—
“Indicative dose” means the committed effective dose for one year of ingestion resulting from all the radionuclides (whose presence has been detected in water supplied for human consumption purposes) of natural and artificial origin, but excluding tritium, potassium-40, radon and radon decay products;
“NTU” means Nephelometric Turbidity Unit;
“PAH: Total” means the sum of the concentrations of the following polyaromatic hydrocarbons: benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene and indeno(1,2,3-cd)pyrene;
“Pesticide” means an organic insecticide, herbicide, fungicide, nematocide, acaricide, algicide, rodenticide, slimicide, molluscicide or related product (including a growth regulator), and includes the relevant metabolites, degradation and reaction products of that pesticide;
“Pesticides: Total” refers to the sum of the concentrations of each pesticide detected and quantified in the monitoring procedure;
“Tetrachloroethene and Trichloroethene” means the sum of the concentrations of tetrachloroethene and trichloroethene; and
“THM: Total” means the sum of the concentrations of the following trihalomethanes: chloroform, bromoform, dibromochloromethane and bromodichloromethane.

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Source: https://www.legislation.gov.uk/sdsi/2014/9780111024782/schedule/1 (the official version)
Page: https://openlegislation.uk/draft-public-water-supplies-scotland-regulations-2014/schedule-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.