Who regulates drinking water quality?
The U.S. Environmental Protection Agency (USEPA) establishes and enforces national drinking water standards. In California, enforcement of drinking water standards falls under the State Water Resources Control Board (SWRCB) Drinking Water Division. Both agencies set maximum contaminant levels (MCLs) for various compounds in water to provide safe drinking water supplies.

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1. What is the fluoride level of Rancho's water?
2. What about water softeners?
3. Who regulates drinking water quality?