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Most probably because e. coli is the most harmful pathogen and appears most often in water. These contaminated water mostly compose of the bacteria which can lead to bad health. 

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Answer:

As it indicates the levels of the water contamination.

Explanation:

  • As the e-coil can survive for short periods of time in the environments and hence it has a universal use in finding out the levels of the water contamination of the waterways.
  • Other methods are the levels of the dissolved oxygen and the water transparency and other visual tests.

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