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

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Regulation 3

SCHEDULE 2GUIDELINE VALUES

No in Annex II to 75/440/EECParametersDW1DW2DW3
1

The value given is an upper limit set in relation to the mean annual temperature (high and low).

2

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

*

See regulation 8(1)(c)

1pH6.5 to 8.55.5 to 95.5 to 9
2Coloration (after simple filtration)mg/1 Pt Scale105050
3Total suspended solidsmg/1 SS25
4Temperature°C222222
5Conductivity at 20°Cμs/cm100010001000
6Odourdilution factor at 25°C31020
7*Nitratesmg/1 NO325
81Fluoridesmg/1 F0.7 to 10.7 to 1.70.7 to 1.7
10*Dissolved ironmg/1 Fe0.111
11*Manganesemg/1 Mn0.050.11
12Coppermg/1 Cu0.020.051
13Zincmg/1 Zn0.511
14Boronmg/1 B111
19Arsenicmg/1 As0.010.05
20Cadmiummg/1 Cd0.0010.0010.001
24Mercurymg/1 Hg0.00050.00050.0005
27Sulphatesmg/1 SO4150150150
28Chloridesmg/1 Cl200200200
29Surfactants (reacting with methyl blue)mg/1 (laurylsulphate)0.20.20.5
30*2Phosphatesmg/1 P2O50.40.70.7
31Phenols (phenol index) paranitroaniline 4-aminoantipyrinemg/1 C6H5OH0.0010.01
32Dissolved or emulsified hydro carbons (after extraction by petroleum ether)mg/10.5
35*Chemical oxygen demand (COD)mg/1 O230
36*Dissolved oxygen saturation rate% O2>70>50>30
37*Biochemical oxygen demand (BOD5) (at 20°C without nitrification)mg/1 O2<3<5<7
38Nitrogen Kjeldahl method (except NO3)mg/1 N123
39Ammoniamg/1 NH40.0512
40Substances extractable with chloroformmg/1 SEC0.10.20.5
43Total coliforms 37°C/100ml505,00050,000
44Faecal coliforms/100ml202,00020,000
45Faecal streptococci/100ml201,00010,000
46SalmonellaNot present in 5,000mlNot present in 1,000ml

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