An official website of the United States government.

We've made some changes to 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.

Drinking Water Requirements for States and Public Water Systems

Public Water Systems, Disinfection Byproducts, and the Use of Monochloramine

Answers to questions regarding public water systems, disinfection byproducts, and the use of monochloramine.

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