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 This website is no longer updated and links to external websites and some internal pages may not work.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

Section 404 of the Clean Water Act

Final Revisions to the Clean Water Act Regulatory Definitions of "Fill Material" and "Discharge of Fill Material"

On May 9, 2002, the Army Corps of Engineers and the EPA published a rule reconciling their previously differing Clean Water Act section 404 regulations defining the term "fill material'' and amended their definition of "discharge of fill material.'' The final rule completes a rulemaking process initiated by an April 20, 2000, proposal. The final rule amends the regulations so that both agencies have identical definitions of these key terms. The effective date for the final rule was June 10, 2002.