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 This website is no longer updated and links to external websites and some internal pages may not work.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 »

Monitoring the Occurrence of Unregulated Drinking Water Contaminants

Contact Us

Learn More

Monitoring the Occurrence of Unregulated Drinking Water Contaminants

About Monitoring Unregulated Drinking Water Contaminants

Current and Previous UCMRs

Laboratory Approval

Occurrence and Reporting Data

The Safe Drinking Water Act requires that EPA monitor for no more than 30 unregulated contaminants every five years.

Contact Us to ask a question, provide feedback, or report a problem.