An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Drinking Water Requirements for States and Public Water Systems

Radionuclides Rule Question and Answer Fact Sheet

The following questions and answers are from the EPA Radionuclides Rule webcasts on August 4, 2004, and June 29, 2004.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.