Comment Letter: Updated Definition of “Waters of the United States” Jan 5, 2026 Comment Letters To: Stacey Jensen, Office of Water, U.S. Environmental Protection Agency and Milton Boyd, Office of the Assistant Secretary of the Army for Civil Works, U.S. Department of the Army Subject: U.S. Environmental Protection Agency and U.S. Army Corps of Engineers Updated Definition of “Waters of the United States” — Docket ID No. EPA-HQ-OW-2025-0322 Letter Excerpt: The Association of California Water Agencies (ACWA) respectfully submits comments regarding the U.S. Environmental Protection Agency’s (EPA) and U.S. Army Corps of Engineers (USACE) (collectively “the agencies”) updated definition of “waters of the United States” (WOTUS).1 ACWA appreciates the agencies’ progress and supporting materials2 to develop a durable definition of WOTUS to meet the nation’s water supply and quality needs. ACWA’s recommendations are discussed below. Download Comment Letter
