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^f1

(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^f2
4.	Aluminium^f3	< 100	1	2
5.	Ammonium	100-4,999	2	4
6.	Clostridium perfringens (including spores) ^f4	5,000-9,999	6	12
6.	Clostridium perfringens (including spores) ^f4	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 ^f5
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 ^f6
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^f7

(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)^f8	< 20	–	2
1.	Clostridium perfringens (including spores)^f8	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^f9	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^f10
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^f11

(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^f12	< 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.

Annotations

Footnotes

f1

This table specifies the number of samples to be taken at sampling points for the purposes of regulation 9(1)(a) and (2).

f2

(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.

f3

(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.

f4

(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).

f5

(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).

f6

(c)

Only those pesticides which are likely to be present in a given supply need to be monitored.

f7

This table specifies the number of samples to be taken at supply points for the purposes of regulation 9(1)(b) and (2).

f8

(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.

f9

(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).

f10

(c)

Only those pesticides which are likely to be present in a given supply need to be monitored.

f11

This table specifies the number of samples to be taken at treatment works for the purposes of regulation 11.

f12

(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.