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 This website is no longer updated and links to external websites and some internal pages may not work.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

SW-846 Test Method 4015: Screening for 2,4-Dichlorophenoxyacetic Acid by Immunoassay

This document explains the procedure for screening soils and aqueous matrices to determine whether 2,4-dichlorophenoxyacetic acid (2,4-D) [Chemical Abstracts Service (CAS) Registry 94-75-7] is likely to be present.

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