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EPA and the Army Corps’ Rule to Define “Waters of the United States”

Published Jan 5, 2017Updated Jun 20, 2025

The Congressional Research Service is a nonpartisan policy and legal analysis arm of the Library of Congress. CRS reports are written for members of Congress and their staff, not the public — but they’re made available openly through Congress.gov.

EPA and the Army Corps’ Rule to Define “Waters of the United States” — Informed