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 This website is no longer updated and links to external websites and some internal pages may not work.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

Guidance on Choosing a Sampling Design for Environmental Data Collection for use in Developing a Quality Assurance Project Plan

This document will provide assistance in developing an effective QA Project Plan as described in Guidance for QA Project Plans.

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