Most Probable Number (MPN) test for coliforms in drinking water is used as an indicator of:
Choose the correct answer
Turbidity
Hardness
Faecal contamination (presence of pathogens from sewage)
Dissolved oxygen
Correct Answer
C. Faecal contamination (presence of pathogens from sewage)
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Coliform bacteria (E. coli) are indicators of faecal contamination. MPN test (IS 1622): water is inoculated into lactose broth; gas production in 48 h = positive. MPN per 100 mL must be 0 in treated drinking water (IS 10500). 3-tube or 5-tube MPN series used.
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