To amend the Safe Drinking Water Act with respect to civil actions against public waters systems that are in compliance with national drinking water regulations promulgated by the Administrator of the Environmental Protection Agency.

Amends the Safe Drinking Water Act to provide that in a civil action seeking relief on the basis of a level of a contaminant in water in a public water system, relief may not be provided by any Federal or State court (whether the defendant is a public or private entity) if: (1) the level of the contaminant is at or below the applicable maximum contaminant level established in national drinking water regulations promulgated by the Administrator of the Environmental Protection Agency; or (2) the public water system is using treatment techniques in accordance with such regulations.