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.

Handbook for Analytical Quality Control in Water and Wastewater Laboratories from March 1979

Handbook on quality control for chemical and biological tests is addressed to lab directors, leaders of field investigations, and others with responsibility for waste and wastewater data.

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