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The Water Supply (Water Quality) Regulations 2018

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Regulations 15 and 16

SCHEDULE 5ANALYTICAL METHODOLOGY

Table A1

Parameters for which, subject to Regulation 15(7), methods of analysis are specified

(1)

Parameter

(2)

Method of analysis

E. coli and coliform bacteriaEN ISO 9308-1(1) or EN ISO 9308-2(2)
EnterococciEN ISO 7899-2(3)
Pseudomonas aeruginosaEN ISO 16266(4)

Enumeration of culturable microorganisms

– colony count 22°c

EN ISO 6222(5)

Enumeration of culturable microorganisms

– colony count 36°c

EN ISO 6222
Clostridium perfringens including sporesEN ISO 14189(6)

Table A2

Parameters in relation to which methods of analysis must satisfy prescribed characteristics

(1)

Parameters

(2)

Trueness % of prescribed concentration or value or specification

(3)

Precision % of prescribed concentration or value or specification

(4)

Limit of detection % of prescribed concentration or value or specification

(1)

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

(2)

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

(3)

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

(4)

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

(5)

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

(6)

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

Aluminium101010
Ammonium101010
Antimony252525
Arsenic101010
Benzene252525
Benzo(a)pyrene252525
Boron101010
Bromate252525
Cadmium101010
Chloride101010
Chromium101010
Colour101010
Conductivity101010
Copper101010
Cyanide (1)101010
1,2-dichloroethane252510
Fluoride101010
Hydrogen ion concentration pH (expressed in pH units)0.20.2
Iron101010
Lead101010
Manganese101010
Mercury201020
Nickel101010
Nitrate101010
Nitrite101010
Pesticides and related products (2)252525
Polycyclic aromatic hydrocarbons (3)252525
Selenium101010
Sodium101010
Sulphate101010
Tetrachloromethane202510
Trichloroethene (4)252510
Trihalomethanes:252510
Total (3)
Turbidity (5)101010
Turbidity (6)252525
Notes:

Table A3

Minimum performance characteristic “uncertainty of measurement”

The uncertainty of measurement laid down in this table must not be used as an additional tolerance to the parametric values set out in Schedules 1 and 2.

(1)

Parameter

(2)

Uncertainty of measurement % of the parametric value (except for pH) (1)

(1)

“Uncertainty of measurement” is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurement, based on the information used. The performance criterion for measurement uncertainty (k = 2) is at least the percentage of the parametric value stated in the table. If the value of uncertainty of measurement cannot be met, the best available technique must be selected (up to 60 % of the parametric value).

(2)

The method determines total cyanide in all forms.

(3)

Reference method: European standard EN ISO 8467 entitled “Water quality - Determination of permanganate index (ISO 8467)”(7).

(4)

The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30% can be achieved for several pesticides, higher values up to 80% may be allowed for a number of pesticides.

(5)

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

(6)

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

(7)

The uncertainty of measurement must be estimated at the level of 3 mg/l of the total organic carbon (TOC) in accordance with European standard EN 1484 entitled “Water analysis - Guidelines for the determination of total organic carbon and dissolved organic carbon”(8) and dissolved organic carbon (DOC) shall be used.

(8)

The uncertainty of measurement must be estimated at the level of 1,0 NTU in accordance with European standard EN ISO 7027-1 entitled “Water quality - Determination of turbidity - Part 1: Quantitative methods (ISO 7027-1”(9).

Aluminium25
Ammonium40
Antimony40
Arsenic30
Benzene40
Benzo(a)pyrene (2)50
Boron25
Bromate40
Cadmium25
Chloride15
Chromium30
Colour20
Conductivity20
Copper25
Cyanide (3)30
1,2-dichloroethane40
Fluoride20
Hydrogen ion concentration pH (expressed in pH units)0.2
Iron30
Lead25
Manganese30
Mercury30
Nickel25
Nitrate15
Nitrite20
Oxidisability (4)50
Pesticides (5)30
Polycyclic aromatic hydrocarbons (6)50
Selenium40
Sodium15
Sulphate15
Tetrachloroethene (6)30
Tetrachloromethane30
Trichloroethene (7)40
Trihalomethanes: total (6)40
Total organic carbon (8)30
Turbidity 930
Notes:
(1)

This standard entitled “Water quality - Enumeration of Escherichia coli and coliform bacteria - Part 1: Membrane filtration method for waters with low bacterial background flora (ISO 9308-1:2014)” was approved by the European Committee for Standardization (CEN) on 18 January 2017. Under reference BS EN ISO 9308-1:2014+A1:2017, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 92379 1).

(2)

This standard entitled “Water quality - Enumeration of Escherichia coli and coliform bacteria - Part 2: Most probable number method (ISO 9308-2:2012)” was approved by the European Committee for Standardization (CEN) on 11 April 2014. Under reference BS EN ISO 9308-2:2014, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 84023 4).

(3)

This standard entitled “Water quality - Detection and enumeration of intestinal enterococci - Part 2: Membrane filtration method (ISO 7899-2:2000)” was approved by the European Committee for Standardization (CEN) on 11 April 2014. Under reference BS EN ISO 7899-2:2000, it is published as a UK standard by the British Standards Institution (ISBN 0 580 34953 5).

(4)

This standard entitled “Water quality - Detection and enumeration of Pseudomonas aeruginosa - Method by membrane filtration (ISO 16266:2006)” was approved by the European Committee for Standardization (CEN) on 11 January 2008. Under reference BS EN ISO 16266:2008, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 59736 7).

(5)

This standard entitled “Water quality - Enumeration of culturable micro-organisms - Colony count by inoculation in a nutrient agar culture medium (ISO 6222:1999)” was approved by the European Committee for Standardization (CEN) on 16 March 1999. Under reference BS EN ISO 6222:1999, it is published as a UK standard by the British Standards Institution (ISBN 0 580 32495 8).

(6)

This standard entitled Water quality - Enumeration of Clostridium perfringens - Method using membrane filtration (ISO 14189:2013)” was approved by the European Committee for Standardization (CEN) on 15 July 2016. Under reference BS EN ISO 14189:2016, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 92184 1).

(7)

This standard was approved by the European Committee for Standardization (CEN) on 3 November 1994. Under reference EN ISO 8467:1995, it is published as a UK standard by the British Standards Institution (ISBN 0 580 23435 5).

(8)

This standard was approved by the European Committee for Standardization (CEN) on 6 April 1997. Under reference BS EN 1484:1997, it is published as a UK standard by the British Standards Institution (ISBN 0 580 28372 0).

(9)

This standard was approved by the European Committee for Standardization (CEN) on 15 April 2016. Under reference BS EN ISO 7027-1:2016, it is published as a UK standard by the British Standards Institution (ISBN 978 0 580 81961 2)

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