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Saturday, December 11, 2010

INWQS for Class 1




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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