Multiple choice

Which of the following, if present in water, indicates microbiological pollution of water?

  1. Coliform bacteria

  2. Magnesium metal

  3. Fluorine

  4. Oil

  5. Sewage

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The coliform bacteria, if present in water, contaminates water and the water is not safe to drink.