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

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Regulation 3


No in Annex II to 75/440/EECParametersDW1DW2DW3

The value given is an upper limit 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 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
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)
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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