How do water systems determine what water quality standards to follow?

 All public water systems must adhere to national water quality standards required by the EPA in the Safe Drinking Water Act. Public health guidelines are non-enforceable advisories to water systems that are meant to be weighed in conjunction with economic and technological feasibility. In some cases, the technology to treat the constituents may not be available, or the cost of treatment too high compared to the risk assessment. As technology advances, new and improved treatment options become more available and affordable for adoption by water utilities.

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1. What does the EWG database show?
2. What does the EWG database not show?
3. Does EWG use nationally accepted standards?
4. What is the California “public health goal (PHG)”?
5. EWG’s database shows the City of Everett’s water supply has contaminants detected above health guidelines – is this dangerous?
6. How do water systems determine what water quality standards to follow?