Question

High amount of $E.coli$ in water is indicator of

• A. Sewage pollution
• B. Industrial pollution
• C. Presence of chlorine in water
• D. Hardness of water

Answer 1

The correct option is A Sewage pollution

Source of $E.coli$ in water
$E.coli$ is a bacteria that form the normal microbiota of the human intestinal tract. Therefore this organism is found in human excreta. Consequently this organism is found in the sewage.
The contamination of water with sewage would cause the presence of $E.coli$ in the water.

Final answer
(C) Sewage pollution