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.

Clean Water Act Analytical Methods

Methods Update Rule Support Documents

Documents related to the final Methods Update Rule (August 2017).
 

You may need Adobe Reader to view files on this page. See EPA’s About PDF page to learn more.