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The Private Water Supplies (Scotland) Regulations 2006

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Regulations 21-23, 29 and 30

SCHEDULE 2PARAMETERS, MONITORING AND SAMPLING FREQUENCIES

This schedule has no associated Executive Note

Table A Check Monitoring: Type A Supplies

Annual sampling frequency (iv)(v)
Volume of water distributed or produced each day within a supply zone (m3) (ii)(iii)

(1)

Item

(2)

Parameter

(3)

≤100

Level 1

(4)

> 100–

≤1000

Level 2

(5)

> 1000

Level 3(i)

Notes:

(i)

The sampling frequency (X) shall be determined as X = 4 + (3 for each 1,000 m3/d and part thereof of the total volume).

(ii)

A supply zone is a geographically defined area within which water intended for human consumption comes from one or more sources and within which water quality may be considered as being approximately uniform.

(iii)

The volumes are calculated as averages taken over a calendar year or using consumption based on the number of inhabitants, assuming a water consumption rate of 200 l/day/capita.

(iv)

Values in (brackets) in columns (4) and (5) are reduced sampling frequencies which may be applied if–

(a)

the values of the results obtained from samples taken during a period of at least two successive years are constant and significantly better than the limits laid down in Schedule 1; and

(b)

no factor is likely to cause a deterioration of the quality of the water.

(v)

As far as possible, the number of samples should be distributed equally in time and location and should be representative of the quality of water consumed or available for consumption throughout the year.

(vi)

Necessary only when used as a flocculant. In all other cases the parameter will be sampled according to the frequency specified for audit monitoring (Table B of Schedule 2).

(vii)

Necessary only if the water originates from, or is influenced by, surface water. In all other cases the parameter will be sampled according to the frequency specified for audit monitoring (Table B of Schedule 2).

(viii)

Necessary only when chloramination is used as a disinfectant. In all other cases the parameter will be sampled according to the frequency specified for audit monitoring (Table B of Schedule 2).

1.Aluminium (vi)14(2)X(X/2)
2.Ammonium14(2)X(X/2)
3.

Clostridium perfringens (vii)

(including spores)

14X
4.Coliform bacteria14X
5.Colony counts14X
6.Colour14(2)X(X/2)
7.Conductivity14(2)X(X/2)
8.Escherichia coli (E.coli)14X
9.Hydrogen ion1(2)X(X/2)
10.Iron (vi)14(2)X(X/2)
11.Nitrite (viii)14(2)X(X/2)
12.Odour14(2)X(X/2)
13.Taste14(2)X(X/2)
14.Turbidity14X

Table B Audit Monitoring: Type A Supplies

Annual sampling frequency
Volume of water distributed or produced each day within a supply zone (m3) (ii)(iii)

(1)

Item

(2)

Parameters

(3)

≤100

Level 1

(4)

> 100 –

≤1000

Level 2

(5)

> 1000

Level 3 (i)

Notes:

(i)

The sampling frequency (Y) shall be determined by–

Volume of water supplied each day (m 3 )Y
> 1000 – ≤ 10,0001 + (1 for each 3,300 m3/d and part thereof of total volume)
> 10,000 – ≤ 100,0003 + (1 for each 10,000 m3/d and part thereof of total volume)
> 100,00010 + (1 for each 25,000 m3/d and part thereof of total volume)
1.Acrylamide11Y
2.Aluminium11Y
3.Antimony11Y
4.Arsenic11Y
5.Benzene11Y
6.Benzo(a)pyrene11Y
7.Boron11Y
8.Bromate11Y
9.Cadmium11Y
10.Chloride11Y
11.Chromium11Y
12.

Clostridium perfringens

(including spores)

11Y
13.Copper11Y
14.Cyanide11Y
15.1,2 dichloroethane11Y
16.Enterococci11Y
17.Epichlorohydrin11Y
18.Fluoride11Y
19.Iron11Y
20.Lead11Y
21.Manganese11Y
22.Mercury11Y
23.Nickel11Y
24.Nitrate11Y
25.Nitrite11Y
26.Pesticides11Y
27.Pesticides – Total11Y
28.Polycyclic Aromatic Hydrocarbons11Y
29.Selenium11Y
30.Silver11Y
31.Sodium11Y
32.Sulphate11Y
33.Tetrachloroethene and Trichloroethene11Y
34.Tetrachloromethane11Y
35.Total indicative dose11Y
36.Total organic carbon11Y
37.Trihalomethanes – Total11Y
38.Tritium11Y
39.Vinyl chloride11Y
40.Zinc11Y

Table C Routine Monitoring: Type B Supplies

Parameters

1.  Coliform bacteria

2.  Conductivity

3.  Enterococci

4.  Escherichia coli (E. coli)

5.  Hydrogen ion

6.  Lead

7.  Nitrate(i)

8.  Odour – qualitative(ii)

9.  Taste – qualitative(ii)

10.  Turbidity

Notes:

(i)Samples need not be analysed for nitrate if there are reasonable grounds for believing that nitrate levels in the locality concerned are below 25 mg NO3/l.

(ii)Samples should not be assessed qualitatively if there are reasonable grounds for suspecting that the water may give rise to a health hazard.

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