Biochemical Oxygen Demand of Safe Drinking Water must be

Answer: A. 0 ppm

Biochemical oxygen demand of safe drinking water must be 0 ppm.

Solution

As per IS 10500: 2012

Drinking water quality parameters are

Parameter	Standard value
pH	6.5-8.5
TDS(mg/l)	500
Hardness as CaCO3(mg/l)	200
BOD (ppm)	0
Alkalinity as CaCO3(mg/l)	200

The presence of BOD shows the presence of organic matter into it which depicts the presence of microorganism into it. And in drinking water there should not be any microorganism present into it. Hence, Biochemical Oxygen Demand (BOD) of drinking water should be zero.

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