We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Monitoring the Occurrence of Unregulated Drinking Water Contaminants

Monitoring the Occurrence of Unregulated Drinking Water Contaminants

Occurrence and Reporting Data

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