The Water Supply (Water Quality) Regulations 2001 (revoked)

regulations 2 and 4

SCHEDULE 1 E+W PRESCRIBED CONCENTRATIONS AND VALUES

TABLE A E+W MICROBIOLOGICAL PARAMETERS

Part I:

Directive requirements

Item	Parameters	Concentration or Value (maximum)	Units of Measurement	Point of compliance
1.	Enterococci	0	number/100ml	Consumers’ taps
2.	Escherichia coli (E. coli)	0	number/100ml	Consumers’ taps

Part II:

National requirements

Item	Parameters	Concentration or Value (maximum)	Units of Measurement	Point of compliance
1.	Coliform bacteria	0	number/100ml	Service reservoirs* and water treatment works
2.	Escherichia coli (E. coli)	0	number/100ml	Service reservoirs and water treatment works

Note: *Compliance required as to 95% of samples from each service reservoir (regulation 4(6)).

TABLE B E+W CHEMICAL PARAMETERS

Part I:

Directive requirements

Item	Parameters	Concentration or Value (maximum)	Units of Measurement	Point of compliance
1.	Acrylamide	0.10	℞g/l	(i)
2.	Antimony	5.0	℞gSb/l	Consumers’ taps
3.	Arsenic	10	℞gAs/l	Consumers’ taps
4.	Benzene	1.0	℞g/l	Consumers’ taps
5.	Benzo(a)pyrene	0.010	℞g/l	Consumers’ taps
6.	Boron	1.0	mgB/l	Consumers’ taps
7.	Bromate	10	℞gBrO3/l	Consumers’ taps
8.	Cadmium	5.0	℞gCd/l	Consumers’ taps
9.	Chromium	50	℞gCr/l	Consumers’ taps
10.	Copper(i)	2.0	mgCu/l	Consumers’ taps
11.	Cyanide	50	℞gCN/l	Consumers’ taps
12.	1, 2 dichloroethane	3.0	℞g/l	Consumers’ taps
13.	Epichlorohydrin	0.10	℞g/l	(i)
14.	Fluoride	1.5	mgF/l	Consumers’ taps
15.	Lead(ii)	(a)25, from 25th December 2003 until immediately before 25th December 2013	℞gPb/l	Consumers’ taps
		(b)10, on and after 25th December 2013	℞gPb/l	Consumers’ taps
16.	Mercury	1.0	℞gHg/l	Consumers’ taps
17.	Nickel(ii)	20	℞gNi/l	Consumers’ taps
18.	Nitrate(iii)	50	mgNO3/l	Consumers’ taps
19.	Nitrite(iii)	0.50	mgNO2/l	Consumers’ taps
		0.10		Treatment Works
20.	Pesticides(iv)(v) Aldrin ) Dieldrin ) Heptachlor ) Heptachlor ) epoxide )	0.030	℞g/l	Consumers’ taps
	other pesticides	0.10	℞g/l	Consumers’ taps
21.	Pesticides: Total(vi)	0.50	℞g/l	Consumers’ taps
22.	Polycyclic aromatic hydrocarbons(vii)	0.10	℞g/l	Consumers’ taps
23.	Selenium	10	℞gSe/l	Consumers’ taps
24.	Tetrachloroethene and Trichloroethene(viii)	10	℞g/l	Consumers’ taps
25.	Trihalomethanes: Total(ix)	100	℞g/l	Consumers’ taps
26.	Vinyl chloride	0.50	℞g/l	(i)

Notes:

(i) The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification.

(ii) See also regulation 6(6).

(iii) See also regulation 4(2)(d).

(iv) See the definition of “pesticides and related products” in regulation 2.

(v) The parametric value applies to each individual pesticide.

(vi) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.

(vii) The specified compounds are:

• - benzo(b)fluoranthene

• - benzo(k)fluoranthene

• - benzo(ghi)perylene

• - indeno(1,2,3-cd)pyrene.

• The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.

  (viii)

  The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.

  (xi)

  The specified compounds are:

  • - chloroform

  • - bromoform

  • - dibromochloromethane

  • - bromodichloromethane.

• The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.

  Part II:

  National requirements

  Item	Parameters	Concentration or Value (maximum unless otherwise stated)	Units of Measurement	Point of compliance
  1.	Aluminium	200	℞gAl/l	Consumers’ taps
  2.	Colour	20	mg/l Pt/Co	Consumers’ taps
  F1 . . .	F1 . . .	F1 . . .	F1 . . .	F1 . . .
  		F2 . . .	F2 . . .	F2 . . .
  4.	Iron	200	℞gFe/l	Consumers’ taps
  5.	Manganese	50	℞gMn/l	Consumers’ taps
  6.	Odour	[F3 Acceptable to consumers and no abnormal change]	F4 . . .	Consumers’ taps
  7.	Sodium	200	mgNa/l	Consumers’ taps
  8.	Taste	[F3 Acceptable to consumers and no abnormal change]	F4 . . .	Consumers’ taps
  9.	Tetrachlorome-thane	3	℞g/l	Consumers’ taps
  10.	Turbidity	4	NTU	Consumers’ taps

Textual Amendments

F1 Words in Pt. II Sch. 1 omitted (22.12.2007) by virtue of The Water Supply (Water Quality) Regulations 2001 (Amendment) Regulations 2007 (S.I. 2007/3374), reg. 1(2), Sch. para. 2(a)

F2 Words in Pt. II Sch. 1 omitted (22.12.2007) by virtue of The Water Supply (Water Quality) Regulations 2001 (Amendment) Regulations 2007 (S.I. 2007/3374), reg. 1(2), Sch. para. 2(b)

F3 Words in Pt. II Sch. 1 substituted (22.12.2007) by The Water Supply (Water Quality) Regulations 2001 (Amendment) Regulations 2007 (S.I. 2007/3374), reg. 1(2), Sch. para. 2(c)(i)

F4 Words in Pt. II Sch. 1 omitted (22.12.2007) by virtue of The Water Supply (Water Quality) Regulations 2001 (Amendment) Regulations 2007 (S.I. 2007/3374), reg. 1(2), Sch. para. 2(c)(ii)

regulations 2 and 4

SCHEDULE 2 E+W INDICATOR PARAMETERS

Item	Parameters	Specification Concentration or Value (maximum [F5 unless otherwise stated]) or State	Units of Measurement	Point of monitoring
1.	Ammonium	0.50	mgNH4/l	Consumers’ taps
2.	Chloride(i)	250	mgCl/l	Supply point*
3.	Clostridium perfringens (including spores)	0	Number/100ml	Supply point*
4.	Coliform bacteria	0	Number/100ml	Consumers’ taps
5.	Colony counts	No abnormal change	Number/1ml at 22°C	Consumers’ taps, service
			Number/1ml at 37°C	Reservoirs and treatment works
6.	Conductivity(i)	2500	℞S/cm at 20°C	Supply point*
7.	Hydrogen ion	9.5	pHvalue	Consumers’ taps
		[F6 6.5 (minimum)]	[F7 pH value]
8.	Sulphate(i)	250	mgSO4 /l	Supply point*
9.	Total indicative dose (for radioactivity)(ii)	0.10	mSv/year	Supply point*
10.	Total organic carbon (TOC)	No abnormal change	mgC/l	Supply point*
11.	Tritium (for radioactivity)	100	Bq/l	Supply point*
12.	Turbidity	1	NTU	Treatment works

Textual Amendments

F5 Words in Sch. 2 heading inserted (22.12.2007) by The Water Supply (Water Quality) Regulations 2001 (Amendment) Regulations 2007 (S.I. 2007/3374), reg. 1(2), Sch. para. 3(a)

F6 Words in Sch. 2 inserted (22.12.2007) by The Water Supply (Water Quality) Regulations 2001 (Amendment) Regulations 2007 (S.I. 2007/3374), reg. 1(2), Sch. para. 3(b)(i)

F7 Words in Sch. 2 inserted (22.12.2007) by The Water Supply (Water Quality) Regulations 2001 (Amendment) Regulations 2007 (S.I. 2007/3374), reg. 1(2), Sch. para. 3(b)(ii)

Notes:

(i) The water should not be aggressive.

(ii) Excluding tritium, potassium-40, radon and radon decay products.

*May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.

Part IV

SCHEDULE 3 E+W MONITORING

TABLE 1 E+W 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.	Colony counts
6.	Colour
7.	Conductivity
8.	Escherichia coli (E. 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 E+W 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
Coliform bacteria	<100		4
Residual disinfectant	.100		12 per 5,000 population(i)
Aluminium
Ammonium
Clostridium perfringens (including spores)*	<100	1	2
	100—4,999	2	4
	5,000—9,999	6	12
Colony counts	10,000—29,999	12	24
Colour	30,000—49,999	18	36
Conductivity*	50,000—79,999	26	52
Hydrogen ion	80,000—100,000	38	76
Iron
Manganese
Nitrate(ii)
Nitrite(ii)
Odour
Taste
Turbidity
Parameters subject to audit monitoring
Aluminium
Antimony
Arsenic
Benzene*	<100		1
Benzo(a)pyrene	100—4,999		4
Boron*	5,000—100,000		8
Bromate(iii)
Cadmium
Chromium
[F8 Clostridium perfringens (including spores)]
Copper
Cyanide*
1,2 dichloroethane*
Enterococci
Fluoride*
Iron
Lead
Manganese
Mercury*
Nickel
Nitrate(ii)
Nitrite(ii)
Pesticides and related products*
Polycyclic aromatic	<100		1
hydrocarbons	100—4,999		4
Selenium	5,000—100,000		8
Sodium
Trichloroethene
/Tetrachloroethene*
Tetrachloromethane*
Trihalomethanes
Chloride*
Sulphate*
Total organic carbon*
Tritium*
Gross alpha*(iv)
Gross beta*(iv)

Textual Amendments

F8 Words in Sch. 3 inserted (22.12.2007) by The Water Supply (Water Quality) Regulations 2001 (Amendment) Regulations 2007 (S.I. 2007/3374), reg. 1(2), Sch. para. 4(a)

Notes: * Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and (iii) below.

(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 practised. In other circumstances audit monitoring is required.

(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 supply points.

(iv) To monitor for total indicative dose (for radioactivity).

TABLE 3 E+W ANNUAL SAMPLING FREQUENCIES: TREATMENT WORKS OR SUPPLY POINTS*

(1)	(2)	(3)	(4)	(5)
Item	Substances and parameters	Volume of water supplied m3/d	Reduced	Standard
1.	E. Coli	<20		4
2.	Coliform bacteria	20—1,999	12	52
3.	Colony counts	2,000—5,999	52	104
4.	Nitrite(ii)	6,000—11,999	104	208
5.	Residual disinfectant	.12,000	104	365
6.	Turbidity
Subject to check monitoring
7.	Clostridium perfringens(i)	<20		2
		20 — 999	2	4
8.	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
9.	Benzene
10.	Boron
11.	Bromate(iv)
[F9 11A]	[F10 Clostridium perfringens (including spores)]
12.	Cyanide
13.	1,2 dichloroethane
14.	Fluoride
15.	Mercury	<20		1
16.	Nitrite(iii)	20—999		4
17.	Pesticides and Related products	1,000—49,999	8
		50,000—89,999	12
		90,000—299,999	24
		300,000—649,000	36
18.	Trichloroethene ) Tetrachloroethene)	.650,000	48
19.	Tetrachloromethane
20.	Chloride
21.	Sulphate
22.	Total organic carbon
23.	Tritium
24.	Gross alpha(v)
25.	Gross beta(v)

Textual Amendments

F9 Word in Sch. 3 inserted (22.12.2007) by The Water Supply (Water Quality) Regulations 2001 (Amendment) Regulations 2007 (S.I. 2007/3374), reg. 1(2), Sch. para. 4(b)(i)

F10 Words in Sch. 3 inserted (22.12.2007) by The Water Supply (Water Quality) Regulations 2001 (Amendment) Regulations 2007 (S.I. 2007/3374), reg. 1(2), Sch. para. 4(b)(ii)

Notes: *Sampling is at treatment works for the substances and parameters shown in column (1) of the Table as items 1 to 6 and at supply points for the other substances and parameters, except nitrite, subject to notes (ii) and (iii) below.

(i) Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3).

(ii) Sampling at treatment works when chloramination is practised.

(iii) Sampling at treatment works when chloramination is not practised.

(iv) Audit monitoring at supply points 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.

(v) To monitor for total indicative dose (for radioactivity).

regulation 16

SCHEDULE 4 E+W ANALYTICAL METHODOLOGY

TABLE A1 E+W PARAMETERS FOR WHICH, SUBJECT TO REGULATION 16(7), METHODS OF ANALYSIS ARE PRESCRIBED

(1)	(2)
Parameter	Method
Clostridium perfringens (including spores)	Membrane filtration followed by anaerobic incubation of the membrane on m-CP agar* at 44+ 1°C for 21+ 3 hours. Count opaque yellow colonies that turn pink or red after exposure to ammonium hydroxide vapours for 20 to 30 seconds.
Coliform bacteria	ISO 9308-1
Colony count 22°C — enumeration of culturable microorganisms	prEN ISO 6222
Colony count 37°C— enumeration of culturable microorganisms	prEN ISO 6222
Enterococci	ISO 7899-2
Escherichia coli (E. coli)	ISO 9308-1

*The composition of m-CP agar is:

Basal medium
Tryptose	30.0g
Yeast extract	20.0g
Sucrose	5.0g
L-cysteine hydrochloride	1.0g
MgSO4·7H2O	0.1g
Bromocresol purple	40.0mg
Agar	15.0g
Water	1,000.0ml

Dissolve the ingredients of the basal medium, adjust pH to 7.6 and autoclave at 121°C for15 minutes. Allow the medium to cool and add:

D-cycloserine	400.0mg
Polymyxine-B sulphate	25.0mg
Indoxyl-[beta]-D-glucoside	60.0mg
to be dissolved in 8ml sterile water before addition
Filter — sterilised 0.5% phenolphthalein diphosphate solution	20.0ml
Filter — sterilised 4.5% FeCl3· 6H2O	2.0ml

TABLE A2 E+W PARAMETERS IN RELATION TO WHICH METHODS OF ANALYSIS MUST SATISFY PRESCRIBED CHARACTERISTICS

(1)	(2)	(3)	(4)
Parameters	Trueness % of prescribed concentration or value or specification	Precision % of prescribed concentration or value or specification	Limit of detection % of prescribed concentration or value or specification
Aluminium	10	10	10
Ammonium	10	10	10
Antimony	25	25	25
Arsenic	10	10	10
Benzene	25	25	25
Benzo(a)pyrene	25	25	25
Boron	10	10	10
Bromate	25	25	25
Cadmium	10	10	10
Chloride	10	10	10
Chromium	10	10	10
Colour	10	10	10
Conductivity	10	10	10
Copper	10	10	10
Cyanide(i)	10	10	10
1,2-dichloroethane	25	25	10
Fluoride	10	10	10
Iron	10	10	10
Lead	10	10	10
Manganese	10	10	10
Mercury	20	10	20
Nickel	10	10	10
Nitrate	10	10	10
Nitrite	10	10	10
Pesticides and related products(ii)	25	25	25
Polycyclic aromatic hydrocarbons(iii)	25	25	25
Selenium	10	10	10
Sodium	10	10	10
Sulphate	10	10	10
Tetrachloromethane	20	20	20
Trichloroethene(iv)	25	25	10
Trihalomethanes: Total(iii)	25	25	10
Turbidity(v)	10	10	10
Turbidity(vi)	25	25	25

Notes:

(i) The method of analysis should determine total cyanide in all forms.

(ii) The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned.

(iii) The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1.

(iv) The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1.

(v) The performance characteristics apply to the prescribed value of 4NTU.

(vi) The performance characteristics apply to the specification of 1NTU for water leaving treatment works.

regulation 40

F11 SCHEDULE 5 E+W AMENDMENT OF THE WATER SUPPLY (WATER QUALITY) REGULATIONS 1989

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Textual Amendments

F11 Schs. 5-6 revoked (1.1.2004) by The Water Supply (Water Quality) Regulations 2001 (S.I. 2001/3911), regs. 1(4), 43(3)(d) (with reg. 43(4)(5))

regulation 41

F11 SCHEDULE 6 E+W PROGRAMMES OF WORK

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