1.

According to the WHO,what is the minimum bacteriological standard for drinking water-

A. All the samples should not contain coliform organisms
B. 3 consecutive samples of water should not contain any coliforms
C. 3 coliforms in a 100 ml water
D. 1 coliform in a 100 ml water
Answer» B. 3 consecutive samples of water should not contain any coliforms


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