The Interim Water Quality Standards for Class 1 are as follows.
Class 1 is considered a very clean water. The water need no treatment as it only need to boil as a drinking water. The supply of drinking water or any sensitive aquatic species must follow this standard to ensure it safe to use.
Ammonical Nitrogen (mg/l)- 0.1
BOD (mg/l) - 1
COD (mg/l) - 10
DO (mg/l) - 7
pH - 6.5-8.5
Colour (TCU) - 15
Electrical Conductivity (mmhos/cm) - 1000
Floatables -
Odour -
Salinity (o/oo) - 0.5
Taste - N
Total Dissolved Solids (mg/l) - 500
Total Suspended Solids (mg/l) - 25
Temperature (oC) -
Turbidity (NTU)- 5
Faecal Caliform* (counts/100ml) -10
Total Coliform (counts/100ml) - 100
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