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 This website is no longer updated and links to external websites and some internal pages may not work.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

Consumer Confidence Reports (CCR)

Appendix A to Subpart O - Regulated Contaminants

Updated version of the Consumer Confidence Reports (CCR) Rule Appendix A, Subpart O. Table containing maximum contaminant levels (MCLs), MCLs in CCR-regulated units, maximum contaminant level goals (MCLGs), major sources of and health effects language for all regulated contaminants that must be reported in the CCR, if detected.

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