Question

High amount of Escherichia coli in water is an indicator of

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

Answer 1

The correct option is C Sewage pollution

Escherechia coli is present in the intestines and is released with the faecal matter. Their presence in the water is indicative of the sewage mixup in the water source.

A. Hardness of water is indicated by the mineral ions concentration.

B. Industrial pollution is indicated by the presence of heavy metals, toxins etc.

C. Escherechia coli presence indicates sewage pollution in water.

D. Chlorine is added for the treatment or purification of water.

Hence, the correct answer is 'Sewage Pollution'.