# The Public Water Supplies (Scotland) Regulations 2014, Schedule 2: MONITORING


TABLE 1
PARAMETERS AND CIRCUMSTANCES FOR CHECK MONITORING
(1)
Item
(2)
Parameter
(3)
Circumstances
1.
Aluminium
When used as flocculant or where the water originates from, or is influenced by, surface waters.
2.
Ammonium
3.
Clostridium perfringens (including spores)
Where the water originates from, or is influenced by, surface waters.
4.
Coliform bacteria
5.
Colony count
6.
Colour
7.
Conductivity
8.
Escherichia coli
9.
Hydrogen ion
10.
Iron
When used as flocculant or where the water originates from, or is influenced by, surface waters.
11.
Manganese
Where the water originates from, or is influenced by, surface waters.
12.
Nitrate
When chloramination is practised.
13.
Nitrite
When chloramination is practised.
14.
Odour
15.
Taste
16.
Turbidity
TABLE 2
ANNUAL SAMPLING FREQUENCIES: SAMPLING POINTS
(1)
Item
(2)
Parameter
(3)
Estimated population of
water supply zone
(4)
Reduced
(5)
Standard
(a)Sampling at the frequencies specified in this table for check monitoring is required only when the circumstances for this parameter in column (3) of Table 1 apply (see regulation 6(4)(b)). Where this is not the case, sampling at the frequencies specified in this table for audit monitoring is required instead.
(b)Subject to note (e), samples for this parameter may, to the extent authorised under regulation 8 for a water supply zone, be taken from alternative supply points in accordance with regulation 9(1)(b).
(c)Only those pesticides which are likely to be present in a given supply need to be monitored.
(d)Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000.
(e)If sodium hypochlorite is added after water has left a treatment works in the water supply zone, monitoring for this parameter must be carried out at sampling points (rather than at supply points).
Subject to check monitoring
1.
Coliform bacteria
< 100
–
4
2.
Escherichia coli
≥100
–
12 per 5,000
3.
Residual disinfectant
population
4.
Aluminium
< 100
1
2
5.
Ammonium
100-4,999
2
4
6.
Clostridium perfringens (including spores)
5,000-9,999
6
12
10,000-29,999
12
24
7.
Colony count
30,000-49,999
18
36
8.
Colour
50,000-79,999
26
52
9.
Conductivity
80,000-100,000
38
76
10.
Hydrogen ion
11.
Iron
12.
Manganese
13.
Nitrate
14.
Nitrite
15.
Odour
16.
Taste
17.
Turbidity
Subject to audit monitoring
18.
Antimony
< 100
–
1
19.
Arsenic
100-4,999
–
4
20.
Benzene
5,000-100,000
–
8
21.
Benzo(a)pyrene
22.
Boron
23.
Bromate
24.
Cadmium
25.
Chloride
26.
Chromium
27.
Copper
28.
Cyanide
29.
1,2-dichloroethane
30.
Enterococci
31.
Fluoride
32.
Lead
33.
Mercury
34.
Nickel
35.
Pesticide
36.
PAH: Total
37.
Selenium
38.
Sodium
39.
Sulphate
40.
Tetrachloroethene and
Trichloroethene
41.
Tetrachloromethane
42.
THM: Total
43.
Total organic carbon
44.
Indicative dose—
Gross alpha
Gross beta
45.
Tritium
Notes—
TABLE 3
ANNUAL SAMPLING FREQUENCIES: SUPPLY POINTS
(1)
Item
(2)
Parameter
(3)
Volume of water
supplied m3/d
(4)
Reduced
(5)
Standard
Notes—
(a)Sampling at the frequencies specified in this table for check monitoring is required only where the water originates from, or is influenced by, surface waters (see Table 1). Where this is not the case, sampling at the frequencies specified in this table for audit monitoring is required instead.
(b)If sodium hypochlorite is added after water has left a treatment works in the water supply zone, audit monitoring for this parameter must be carried out at sampling points (rather than at supply points).
(c)Only those pesticides which are likely to be present in a given supply need to be monitored.
Subject to check monitoring
1.
Clostridium perfringens (including spores)
< 20
–
2
20-999
2
4
2.
Conductivity
1,000-1,999
6
12
2,000-5,999
12
24
6,000-9,999
18
36
10,000-15,999
26
52
16,000-32,999
52
104
33,000-49,999
78
156
50,000-67,999
104
208
68,000-84,999
130
260
85,000-101,999
156
312
102,000-119,999
183
365
120,000-241,999
365
730
242,000-484,999
730
1,460
485,000-728,999
1,095
2,190
Subject to audit monitoring
3.
Benzene
< 20
–
1
4.
Boron
20-999
–
4
5.
Bromate
1,000-49,999
–
8
6.
Chloride
50,00-89,999
–
12
7.
Cyanide
90,000-299,999
–
24
8.
1,2-dichloroethane
300,000-649,999
–
36
9.
Fluoride
≥ 650,000
–
48
10.
Mercury
11.
Pesticide
12.
Sulphate
13.
Tetrachloroethene and
Trichloroethene
14.
Tetrachloromethane
15.
Total organic carbon
16.
Indicative dose—
Gross alpha
Gross beta
17.
Tritium
TABLE 4
ANNUAL SAMPLING FREQUENCIES: TREATMENT WORKS
(1)
Item
(2)
Parameter
(3)
Volume of water
supplied m3/d
(4)
Reduced
(5)
Standard
Notes—
(a)Sampling at the frequencies specified in this table for check monitoring is required only when chloramination is practised. When this is not the case, this parameter must be sampled instead at the frequencies specified in this table for audit monitoring.
Subject to check monitoring
1.
Coliform bacteria
< 20
–
4
2.
Colony count
20-1,999
12
52
3.
Escherichia coli
2,000-5,999
52
104
4.
Residual disinfectant
6,000-11,999
≥12,000
104
208
208
365
5.
Nitrite
< 20
–
2
6.
Turbidity
20-999
2
4
1,000-1,999
6
12
2,000-5,999
12
24
6,000-9,999
18
36
10,000-15,999
26
52
16,000-32,999
52
104
33,000-49,999
78
156
50,000-67,999
104
208
68,000-84,999
130
260
85,000-101,999
156
312
102,000-119,999
183
365
120,000-241,999
365
730
242,000-484,999
730
1,460
485,000-728,999
1,095
2,190
Subject to audit monitoring
7.
Nitrite
< 20
–
1
20-999
–
4
1,000-49,999
–
8
50,000-89,999
–
12
90,000-299,999
–
24
300,000-649,999
–
36
≥650,000
–
48
In this Schedule “Indicative dose”, “Pesticide”, “PAH: Total”, “Tetrachloroethene and Trichloroethene” and “THM: Total” have the same meanings as they have in Schedule 1.

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Source: https://www.legislation.gov.uk/sdsi/2014/9780111024782/schedule/2 (the official version)
Page: https://openlegislation.uk/draft-public-water-supplies-scotland-regulations-2014/schedule-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.