An official website of the United States government.

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.

National Drinking Water Advisory Council (NDWAC) Operator Certification and Occurrence and Contaminant Selection Working Group Summaries

A collection of Operator Certification and Occurrence and Contaminant Selection Working Groups executive summaries.  

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