The Water Supply (Water Quality) Regulations 1989

SCHEDULE 1 EXERCISE OF POWERS

1.  The powers conferred by sections 52 and 53 are exercised by the Secretary of State for Wales, in relation to companies appointed by him to be water undertakers, and by the Secretary of State for the Environment, in relation to other water undertakers; and in this paragraph and paragraph 3 the reference to a company appointed by the Secretary of State to be a water undertaker includes a reference to a company appointed with the consent of, or in accordance with a general authorisation given by, the Secretary of State.

2.  The powers conferred by section 56 are exercised by the Secretary of State for Wales, as respects local authorities exercising functions in Wales, and by the Secretary of State for the Environment, as respects local authorities exercising functions in England.

3.  The powers conferred by section 65 are exercised–

(a) insofar as they relate to the matters specified in subsection (2)(a) to (d), by the Secretary of State for the Environment and the Secretary of State for Wales jointly;

(b) insofar as they relate to the matters specified in subsection (2)(e), by the Secretary of State for Wales, as respects water supplied in Wales by a private supplier and water supplied (whether or not in Wales) by a company appointed by him to be a water undertaker, and by the Secretary of State for the Environment, as respects water supplied in England by a private supplier and water supplied (whether or not in England) by a company appointed by him to be a water undertaker; and

(c) insofar as they relate to the matter specified in subsection (2)(f), by the Secretary of State for Wales, as respects local authorities exercising functions in Wales, and by the Secretary of State for the Environment, as respects local authorities exercising functions in England.

Regulation 3

SCHEDULE 2 PRESCRIBED CONCENTRATIONS OR VALUES

TABLE A

Item	Parameters	Units of Measurement	Concentration or Value (maximum unless otherwise stated)
Note (i) See regulation 3(5). (ii) If silver is used in a water treatment process, 80 may be substituted for 10.
1.	Colour	mg/1 Pt/Co scale	20
2.	Turbidity (including suspended solids)	Formazin turbidity units	4
3.	Odour (including hydrogen sulphide)	Dilution number	3 at 25°C
4.	Taste	Dilution number	3 at 25°C
5.	Temperature	°C	25
6.	Hydrogen ion	pH value	9.55.5 (minimum)
7.	Sulphate	mg SO4/l	250
8.	Magnesium	mg Mg/l	50
9.	Sodium	mg Na/l	150(i)
10.	Potassium	mg K/l	12
11.	Dry residues	mg/l	1500 (after drying at 180°C)
12.	Nitrate	mg NO3/l	50
13.	Nitrite	mg NO2/l	0.1
14.	Ammonium (ammonia and ammonium ions)	mg NH4/l	0.5
15.	Kjeldahl nitrogen	mg N/l	1
16.	Oxidizability (permanganate value)	mg O2/l	5
17.	Total organic carbon	mg C/l	No significant increase over that normally observed
18.	Dissolved or emulsified hydrocarbons (after extraction with petroleum ether); mineral oils	μG/L	10
19.	Phenols	μg C6H5OH/l	0.5
20.	Surfactants	μg/l (as lauryl sulphate)	200
21.	Aluminium	μg Al/l	200
22.	Iron	μg Fe/l	200
23.	Manganese	μg Mn/l	50
24.	Copper	μg Cu/l	3000
25.	Zinc	μg Zn/l	5000
26.	Phosphorus	μg P/l	2200
27.	Fluoride	μg F/l	1500
28.	Silver	μg Ag/l	10(ii)

TABLE B

Item	Parameters	Units of Measurement	Maximum Concentration
Notes (i) The sum of the detected concentrations of individual substances. (ii) The sum of the detected concentrations of fluoranthene, benzo 3.4 fluoranthene, benzo 11.12 fluoranthene, benzo 3.4 pyrene, benzo 1.12 perylene and indeno (1,2,3-cd) pyrene.
1.	Arsenic	μg As/l	50
2.	Cadmium	μg Cd/l	5
3.	Cyanide	μg CN/l	50
4.	Chromium	μg Cr/l	50
5.	Mercury	μg Hg/l	1
6.	Nickel	μg Ni/l	50
7.	Lead	μg Pb/l	50
8.	Antimony	μg Sb/l	10
9.	Selenium	μg Se/l	10
10.	Pesticides and related products:
	(a) individual substances	μg/l	0.1
	(b) total substances(i)	μg/l	0.5
11.	Polycyclic aromatic hydrocarbons(ii)	μg/l	0.2

TABLE C

Item	Parameters	Units of Measurement	Maximum Concentration
Notes (i) See regulation 3(6). (ii) Analysis by multiple tube method.
1.	Total coliforms	number/100 ml	0(i)
2.	Faecal coliforms	number/100 ml	0
3.	Faecal streptococci	number/100 ml	0
4.	Sulphite-reducing clostridia	number/20 ml	≤1(ii)
5.	Colony counts	number/1 ml at 22°C or 37°C	No significant increase over that normally observed

TABLE D(i)

Item	Parameters	Units of Measurement	Maximum Concentration or Value
Note: (i) See regulation 3(3)(d).
1.	Conductivity	μS/cm	1500 at 20°C
2.	Chloride	mg Cl/l	400
3.	Calcium	mg Ca/l	250
4.	Substances extractable in chloroform	mg/l dry residue	1
5.	Boron	μg B/l	2000
6.	Barium	μg Ba/l	1000
7.	Benzo 3,4 pyrene	ng/l	10
8.	Tetrachloromethane	μg/l	3
9.	Trichloroethene	μg/l	30
10.	Tetrachloroethene	μg/l	10

TABLE E

Item	Parameters	Units of Measurement	Minimum Concentration(i)
Note: (i) See regulation 3(2).
1.	Total hardness	mg Ca/l	60
2.	Alkalinity	mg HCO3/l	30

Regulations 13 and 17

SCHEDULE 3 SAMPLING FREQUENCIES

TABLE 1:

Sampling frequencies at consumers' taps

Parameters	Water Supply Zone		Sampling Frequency (number per annum)
	Volume distributed (m3/d) for domestic purposes	Population Supplied	Reduced		Standard	Increased
			Ground water	Surface water
Conductivity or	≤100	≤500			4	12
hydrogen ion	101– 1000	501– 5000	4	4	6	12
Odour	1001– 2000	5001–10000	4	6	12	24
(qualitative)	2001– 4000	10001–20000	6	2	24
Taste	4001– 7000	20001–35000	11	21	42
(qualitative)	7001–10000	35001–50000	15	30	60

TABLE 2:

Sampling frequencies at consumers' taps

Parameters	Water Supply Zone		Sampling Frequency (number per annum)
	Volume distributed (m3/d) for domestic purposes	Population Supplied	Reduced		Standard	Increased
			Ground water	Surface water
Odour (quantitative)
Taste (quantitative)
Turbidity	≤100	≤500			4	12
Temparture	101– 1000	501– 5000			4	12
Hydrogen ion	1001– 2000	5001–10000			4	24
Nitrate	2001– 4000	10001–20000	4	4	6	24
Nitrate	4001– 7000	20001–35000	4	5	10	36
Ammonium	7001–10000	35001–50000	4	5	10	48
Iron
Aluminium
Manganese
Colour

TABLE 3:

Sampling frequencies at consumers' taps

Parameters	Water Supply Zone		Sampling Frequency (number per annum)
	Volume distributed (m3/d) for domestic purposes	Population Supplied	Reduced	Standard	Increased
Notes (i) ie any fungicide, herbicide or insecticide; increased or reduced sampling, where required or permitted, may be confined to the substance in question. (ii) The sum of the detected concentrations of fluoranthene, benzo 3.4 fluoranthene, benzo 11.12 fluoranthene, benzo 3.4 pyrene, benzo 1.12 perylene and indeno (1,2,3-cd) pyrene.
Trihalomethanes	≤7000	≤35000	1	4	12
Tetrachloromethane
Trichloroethene
Tetrachloroethene
Copper
Lead	7001–10000	35001–50000	1	4	24
Zinc
Pesticides(i)
Polycyclic aromatic hydrocarbons(ii)

TABLE 4:

Sampling frequencies at consumers' taps

Parameters	Sampling Frequency(number per annum)
	Standard	Increased
Chloride
Sulphate
Calcium
Magnesium
Sodium
Potassium
Dry residues
Oxidizability (permanganate value)
Total organic carbon
Boron
Surfactants
Phosphorus	1	12
Fluoride
Barium
Silver
Arsenic
Cadmium
Cyanide
Chromium
Mercury
Nickel
Antimony
Selenium
Total hardness
Alkalinity

TABLE 5:

Sampling frequencies at supply points

Water Supply Zone or Combination of Zones		Sampling Frequency (number per annum)
Volume distributed (m3/d) for domestic purposes	Population Supplied	Table 1 Parameters				Table 2 Parameters				Table 3 Parameters				Table 4 Parameters
		Reduced		Standard	Increased	Reduced		Standard	Increased	Reduced		Standard	Increased	Reduced		Standard	Increased
		GW	SW			GW	SW			GW	SW			GW	SW
GW = Ground water SW = Surface water
≤100	≤500			4	12			4	12	1	2	4	12			1	12
101– 1000	501– 5000	4	4	6	12			4	12	1	2	4	12			1	12
1001– 2000	5001– 10000	4	6	12	24			4	24	1	2	4	12			1	12
2001– 4000	10001– 20000	6	12	24		4	4	6	24	1	2	4	12			1	12
4001– 10000	20001– 50000	15	30	60		4	5	10	60	1	2	4	12			1	12
10001– 20000	50001– 100000	30	60	120		5	10	20	60	2	3	6	24	1	1	2	24
20001– 30000	100001– 150000	45	90	180		8	15	30	60	2	3	6	24	1	2	3	24
30001– 60000	150001– 300000	90	180	360		15	30	60	120	2	3	6	24	2	3	6	24
60001–100000	300001– 500000	90	180	360		30	60	120		3	5	10	24	3	5	10	24
100001–200000	500001–1000000	90	180	360		30	60	120		5	10	20	36	5	10	20	36

TABLE 6:

Sampling frequencies at consumers' taps

Parameters	Water Supply Zone		Sampling Frequency (number per annum)
	Volume distributed (m3/d) for domestic purposes	Population Supplied	Standard
Total coliforms }	≤100	≤500	12
Faecal coliforms }	101–1000	501– 5000	12
Residual disinfectant }	1001–2000	5001–10000	24
Colony counts }	2001–4000	10001–20000	48
		20001–50000	at the rate of 12 per 5000 population except in the case of colony counts where the standard number is 5.

TABLE 7:

Sampling frequencies for treatment works

Parameters	Volume of water supplied (m3/d) for domestic purposes	Sampling frequency (number per annum)
		Reduced	Standard
1.  Total and faecal coliforms,	≤2000	12	52
residual disinfectant and colony counts	2001–6000	52	104
2.  Total and faecal coliforms	6001–12000	104	208
and residual disinfectant	>12000	104	365
3.  Colony counts	>6000	52	104

Regulation 30(4)

SCHEDULE 4 INFORMATION FOR LOCAL AUTHORITIES

Regulation 31(2)

SCHEDULE 5 INFORMATION TO BE INCLUDED IN ANNUAL REPORT

FORM A:

(a) WATER LEAVING TREATMENT WORKS

(b) WATER IN SERVICE RESERVOIRS (INCLUDING WATER TOWERS)

(c) WATER AT CONSUMERS' TAPS

FORM B: