Frequent Questions

The Safe Drinking Water Act requires EPA to review and revise the national primary drinking water regulations at least every six years (SDWA 1412(b)(9)). Can EPA establish a less stringent standard for an existing national primary drinking water regulatio

Yes. If new peer-reviewed scientific health effects research indicates that a regulation could be raised while maintaining public health protection, then such a change is permitted. The statute precludes EPA from using economic impacts as the sole basis for a revision that would provide less health protection than the current standard (EPA Protocol for the Review of Existing National Primary Drinking Water Regulations, EPA815-R-03-002, June 2003).
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