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Municipal Separate Storm Sewer System Area

Published by City of Washington, DC | District of Columbia | Catalog Last Checked: May 05, 2026 at 10:39 PM | Dataset Last Updated: February 06, 2026 at 12:00 AM
This layer depicts a generalized boundary of the District’s Municipal Separate Storm Sewer System (MS4) drainage areas. Each sewershed shows the general drainage area of a system of pipes and structures that carries only stormwater runoff that empty into natural or manmade surface waterways. This data is a requirement of the District's MS4 Permit. It is used for stormwater management and all aspects supporting efforts to comply with the Clean Water Act in the District. The dataset contains locations and attributes of the drainage areas of MS4 outfalls.

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