Question

what is coliform bacteria

Answer 1

Coliform bacteria are a commonly used indicator of sanitary quality of foods and water. They are defined as rod-shaped Gram-negative non-spore forming and motile or non-motile bacteria which can ferment

Answer 2

we can determine how polluted the water is with the count of coliform bacteria
if it is greater than   1500 mg/l. then it is called to be polluted