The Water Supply (Water Quality) (Scotland) Regulations 2000
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Part IV
SCHEDULE 3
MONITORING
TABLE 1
PARAMETERS AND CIRCUMSTANCES FOR CHECK MONITORING
|
(1)
|
(2)
|
(3)
|
|
Item
|
Parameter
|
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.
|
Colour
|
|
|
6.
|
Conductivity
|
|
|
7.
|
Escherichia coli (E. Coli)
|
|
|
8.
|
Hydrogen ion concentration
|
|
|
9.
|
Iron
|
When used as flocculant or where the water originates
from, or is influenced by, surface waters
|
|
10.
|
Manganese
|
Where the water originates from, or is influenced by,
surface waters
|
|
11
|
Nitrate
|
When chloramination is practised
|
|
12.
|
Nitrite
|
When chloramination is practised
|
|
13.
|
Odour
|
|
|
14.
|
Taste
|
|
|
15.
|
Turbidity
|
|
TABLE 2
ANNUAL SAMPLING FREQUENCIES: WATER SUPPLY ZONES
|
(1)
|
(2)
|
(3)
|
(4)
|
|
Substances and parameters subject to check monitoring
|
Estimated population of water supply zone
|
Reduced
|
Standard
|
| E. Coli |
< 100
|
|
|
|
Coliform bacteria
Residual disinfectant
|
>100
|
|
[4]
12 per 5000 population(i)
|
| Aluminium |
< 100
|
[1]
|
[1][2]
|
| Ammonium |
100 - 4,999
|
2
|
4
|
| Colony counts |
5,000 - 9,999
|
6
|
12
|
| Colour |
10,000 - 29,999
|
12
|
24
|
| Hydrogen ion |
30,000 - 49,999
|
18
|
36
|
| Iron |
50,000 - 79,999
|
26
|
52
|
| Manganese |
80,000 - 99,999
|
38
|
76
|
|
Nitrate(ii)
Nitrite(ii)
Odour
Taste
Turbidity
|
|
|
|
|
Parameters subject to audit monitoring
|
|
|
|
|
Antimony
Arsenic
Benzo-pyrene
Bromate(iii)
Cadmium
Chromium
|
|
|
|
| Copper |
< 100 |
|
[1]
|
| Enterococci |
100 - 4,999
|
|
4
|
| Lead |
5,000 - 99,999
|
|
8
|
|
Nickel
Polycyclic aromatic hydrocarbons
Selenium
Trihalomethanes
|
|
|
|
Notes:
(i) 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.
(ii) Check monitoring in water supply zones is required
only where chloramination is used as a disinfectant. In other circumstances
the parameters are subject to audit monitoring at treatment works. See regulations
6(2) and 8.
(iii) Audit monitoring in water supply zones is required
only where sodium hypochlorite is added after water has left the treatment works.
In other circumstances, audit monitoring is required at treatment works.
TABLE 3
ANNUAL SAMPLING FREQUENCIES: TREATMENT WORKS
|
(1)
|
(2)
|
(3)
|
(4)
|
(5)
|
|
Item
|
Substances and parameters subject to check monitoring
|
Volume of water
supplied m3/d
|
Reduced
|
Standard
|
| |
|
1.
|
E. Coli
|
< 20
|
|
[4]
|
|
|
|
20 - 1,999
|
12
|
52
|
|
2.
|
Coliform bacteria
|
2,000 - 5,999
|
52
|
104
|
|
|
|
6,000 - 11,999
|
104
|
208
|
|
3.
|
Residual disinfectant
|
> 12,000
|
104
|
365
|
|
4.
|
Clostridium perfringens(i)
|
< 20
|
|
[1][2]
|
|
|
|
20 - 999
|
2
|
4
|
|
|
|
1,000 - 1,999
|
6
|
12
|
|
5.
|
Colony counts
|
2,000 - 5,999
|
12
|
24
|
|
|
|
6,000 - 9,999
|
18
|
36
|
|
6.
|
Conductivity
|
10,000 - 15,999
|
26
|
52
|
|
|
|
16,000 - 32,999
|
52
|
104
|
|
7.
|
Turbidity
|
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
|
|
8.
|
Benzene
|
|
|
|
|
9.
|
Boron
|
|
|
|
|
10.
|
Bromate(ii)
|
|
|
|
|
11.
|
Cyanide
|
|
|
|
|
12.
|
1,2 dichloroethane
|
|
|
|
|
|
|
< 20
|
|
[1]
|
|
13.
|
Fluoride
|
20 - 999
|
|
4
|
|
|
|
1,000 - 49,999
|
|
8
|
|
14.
|
Mercury
|
50,000 - 89,999
|
|
12
|
|
|
|
90,000 - 299,999
|
|
24
|
|
15.
|
Nitrate(iii)
|
> 300,000
|
|
36
|
|
16.
|
Nitrite(iii)
|
|
|
|
|
17.
|
Pesticides
|
|
|
|
|
18.
|
Sodium
|
|
|
|
|
19.
|
Trichloroethene)
Tetrachloroethene)
|
|
|
|
|
20.
|
Tetrachloromethane
|
|
|
|
|
21.
|
Total hardness (minimum) (only if water is softened or
desalinated)
|
|
|
|
|
22.
|
Chloride
|
|
|
|
|
23.
|
Sulphate
|
|
|
|
|
24.
|
Total organic carbon
|
< 20
|
|
[1]
|
|
|
|
20 - 999
|
|
4
|
|
25.
|
Tritium
|
1,000 - 49,999
|
|
8
|
|
|
|
50,000 - 89,999
|
|
|
|
[26]
|
[Gross alpha]
|
90,000 - 299,999
|
|
12
|
|
|
|
> 300,000
|
|
24
|
|
[27]
|
[Gross beta]
|
|
|
36
|
Notes:
(i) Check monitoring is required only in respect
of surface waters (see regulation 6(2) and Table 1 in Schedule 3).
(ii) Audit monitoring at treatment works is required
only where sodium hypochlorite is not added after water has left the treatment
works. In other circumstances, audit monitoring is required in water supply
zones.
(iii) Audit monitoring at treatment works is required
only where chloramination is not practised. In other circumstances the
parameters are subject to check monitoring in water supply zones. See regulation
6(2) and Table 1 in Schedule 3, and regulation 8.
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