(a) Primary water quality criteria for class SW-I waters
Sl. No.
Parameter
Standards
Rationale/Remarks
1.
pH range
6.5-8.5
General Board range, conductive for propagation of aquatic lives is given. Value largely dependent upon soil-water interation.
2.
Dissolved Oxygen
5.0 mg/l or 60 percent saturation value whichever is higher
Not less than 3.5 mg/l at any time of the year for protection of aquatic lives.
3.
Colour and Odour
No noticeable colour or offensive odour
Specially caused by chemical compound like creosols, phenol, naptha pyridine benzene, toluene etc. causing visible colouration of salt crystal and fainting fish flesh.
4.
Floating Matters
No obnoxious or detrimental for use purpose.
Surfactants should not exceed an upper limit of 1.0 mg/l and the concentratic not to cause any visible foam.
5.
Suspended Solids
None from sewage or industrial waste origin
Setteable inert matters not in such concentration that would impair any usages specially assigned to this class.
6.
Oil and Grease (including Petroleum Products)
0.1 mg/l
Concentration should not exceed 0.1 mg/l as because it has effect on fish eggs and larvae.
7.
Heavy Metals : Mercury (as Hg) Lead ( as Pb) Cadmium (as Cd)
• mg/l
• mg/l
0.01 mg/l
Values depends on :
• Concentration in salt, fish and shell fish
• Average per capita consumption per day.
• Minimum ingestion rate that induces symptoms of resulting disease.
(b) Primary water quality criteria for class SW-II waters
Sl. No.
Parameter
Standards
Rationale/Remarks
1.
pH range
6.5-8.5
Range does not cause skin or eye irritation and is also conducive for propagation of aquatic lives.
2.
Dissolved Oxygen
40 mg/l or 5 percent saturation value whichever is higher
Not less than 3.5 mg/l at any time of of aquatic lives.
3.
Colour and Odour
No noticeable colour or offensive odour
Specially caused by chemical compound like creosols, phenol, naptha pyridine benzene, toluene etc. causing visible colouration and tainting of and odour in fish flesh
4.
Floating Matters
No obnoxious or detrimertal for use purpose
None in such concentration that would impair usages specially assigned to this class
5.
Turbidity
30 NTU (Nephelo Turbidity Unit)
Measured at 0.9 depth
6.
Fecal Coliform
100 / 100 ml (MPN)
The average value not exceeding 200/100 ml in 20 percent of samples in the year and in 3 consecutive samples in monsoon months
