used to control the growth of microbes. But when levels are too high, they can cause eye and nose irritation, stomach upset and other problems. The Environmental Protection Agency sets national standards for drinking water that include maximum legal limits on more than 90 contaminants. The agency also requires water authorities to perform certain tests for contaminants to ensure the standards are achieved. And it dictates how contaminants should be removed. That’s why it’s important to understand how these types of contamination happen and
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