A test used for determinig the biological quality of drinking water is

Acidity test

Coliform test

Iodine test

Widal test

Coliform test is used to determine the presence of coliform bacteria in the sample, which derives its origin from human excreta.
The most basic test for bacterial contamination of a water supply is the test for total coliform bacteria.
Total coliform counts give a general indication of the sanitary condition of a water supply.
Widal test is one method that may be used to help make a presumptive diagnosis of enteric fever, also known as typhoid fever.

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