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Water Quality Regulations

Notice of Solicitation of Public Comment - Regulations for Discharge of Groundwater to the Municipal Separate Stormwater Sewer System (MS4)
Notice is hereby given that the proposed 21 DCMR 1600: Discharge of Groundwater to the Municipal Separate Stormwater Sewer System (MS4) will be open for public comment upon its publication in the DC Register on May 26, 2023. The public comment period will run for sixty (60) days. Read  More>>

Most Requested Rules and Regulations

Water Quality Standards - 2016 Triennial Review

Action to Amend the Ban on Swimming in the Potomac and Anacostia Rivers

Water Quality Regulatory and Legislative Affairs

Stormwater Regulations:

Disclaimer: These regulations on our website were proofed to the best of our ability. When legal matters are involved it is best to check the DC Register, DC Municipal Regulations, and DC Code for the printed versions. Please contact the Office of Documents to order printed versions, or call (202) 727-5090.

Resources for Businesses

Total Maximum Daily Load (TMDL) Documents

On September 21, 2010, the U.S. Environmental Protection Agency approved a new joint Total Maximum Daily Load (TMDL) to limit trash in the Anacostia River in both the District of Columbia, and the state of Maryland, making the Anacostia the first interstate river in the nation with such a Clean Water Act trash limit.

- Map of Known Wetlands within the District of Columbia [PDF] (Identified by Number)
- Interim Policy on Wetlands
- District of Columbia Wetland Conservation Plan

Water Related Laws and Regulations

General Data and Reports

Fish and Wildlife Regulations

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