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The Surface Waters (Abstraction for Drinking Water) (Classification) Regulations (Northern Ireland) 1996

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regulations 3, 4, 5, 7, 8 and 9

SCHEDULE 1Characteristics of Surface Water intended for the Abstraction of Drinking Water

No in Annex II to 75/440/EECParametersDW1DW2DW3

The values given are upper limits set in relation to the mean annual temperature (high and low).


This parameter has been included to satisfy the ecological requirements of certain types of environment.


See regulation 6(1)(d)


See regulation 6(1)(b)

1pH6.5 to 8.55.5 to 95.5 to 9
2Coloration (after simple filtration)mg/l Pt scale1020(O)50100(O)50200(O)
3Total suspended solidsmg/l SS25
5Conductivityμs/cm−1 at 20°C1,0001,0001,000
6Odour(dilution factor at 25°C)31020
7*Nitratesmg/l NO32550(O)50(O)50(O)
8(1)Fluoridesmg/l F0.7 to 11.50.7 to 1.70.7 to 1.7
10*Dissolved ironmg/l Fe0.10.3121
11*Manganesemg/l Mn0.050.11
12Coppermg/l Cu0.020.05(O)0.051
13Zincmg/l Zn0.531515
14Boronmg/l B111
19Arsenicmg/l As0.
20Cadmiummg/l Cd0.0010.0050.0010.0050.0010.005
21Total Chromiummg/l Cr0.050.050.05
22Leadmg/l Pb0.050.050.05
23Seleniummg/l Se0.010.010.01
24Mercurymg/1 Hg0.00050.0010.00050.0010.00050.001
25Bariummg/l Ba0.111
26Cyanidemg/l CN0.050.050.05
27Sulphatesmg/l SO4150250150250(O)150250(O)
28Chloridesmg/l Cl200200200
29Surfactants (reacting with methyl blue)mg/l (lauryl sulphate)
30*(2)Phosphatesmg/l P2O50.40.70.7
31Phenols (phenol index) paranitraniline 4 amino-antipyrinemg/l C6H5OH0.0010.0010.0050.010.1
32Dissolved or emulsified hydrocarbons (after extraction by petroleum ether)mg/l0.050.20.51
33Polycyclic aromatic hydrocarbonsmg/l0.00020.00020.001
34Total pesticides (parathion, hexachlorocyclohexane, dieldrin)mg/l0.0010.00250.005
35*Chemical oxygen demand (COD)mg/l O230
36*Dissolved oxygen saturation rate% O2>70>50>30
37*Biochemical oxygen demand (BOD5) (at 20°C without nitrification)mg/l O2<3<5<7
38Nitrogen by Kjeldahl method (except NO3)mg/l N123
39Ammoniamg/l NH40.0511.524(O)
40Substances extractable with chloroformmg/l SEC0.10.20.5
43Total coliforms 37°C/100 ml505,00050,000
44Faecal coliforms/100 ml202,00020,000
45Faecal streptococci/100 ml201,00010,000
46SalmonellaNot Present in 5,000 mlNot Present in 1,000 ml

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