Question

What does the presence of coliform bacteria in water body indicate?

Answer 1

Coliform are broad class of bacteria found in our environment.The presence of coliform bacteria in drinking water may indicate a possible presence of harmful disease causing microbe and potential health risk.
hope it help you....

Answer 2

The presence of fecal coliform bacteria in aquatic environments indicates that the water has been contaminated with the fecal material of man or other animals. ... While these bacteria do not directly cause disease, high quantities of fecal coliform bacteria suggest the presence of disease-causing agents.