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Isn there a law that regulates fluoride levels in drinking water?

drinking water fluoride Law levels
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Isn there a law that regulates fluoride levels in drinking water?

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The SDWA has set the Maximum Contaminant Level for fluoride at 4.0 parts per million (ppm). This is a Primary (enforceable) Standard that water systems must meet. The Secondary MCL is 2.0 ppm, which is an aesthetic, rather than a health related standard.

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