Question

Why do cities test their water and what are they looking for?

Answer 1

To use water for domestic use we need to do many tests. to make sure that it is safe for human consumption.

Explanation:

Water from rivers or other sources will have many suspened or dissolved things in it. Chemical qualities. Hardness.pH, Total dissolved solids. turbidity. presence of metals..
Biological tests.make sure it is bacteria free. Coli-form etc...

Residual chlorine..