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 This website is no longer updated and links to external websites and some internal pages may not work.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

Public Notification - Total Trihalomethanes (TTHM) and Haloacetic Acids (HAA5) MCL Template

When a PWS exceedes the maximum contaminant level (MCL) for both Total Trihalomethanes (TTHM) and Haloacetic Acids (HAA5) it must issue a public notice to inform the consumers of its water that the levels of Total Trihalomethanes and Haloacetic Acids detected in their water have exceeded the MCLs set by Federal Regulations. You can use this template as a guide to prepare that public notice.

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