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Sewage No-Discharge Zone (NDZ) locations, EPA HQ, OWOW

Published by United States Environmental Protection Agency | U.S. Environmental Protection Agency | Catalog Last Checked: May 06, 2026 at 12:53 AM | Dataset Last Updated: April 02, 2020 at 12:00 AM
This geospatial dataset depicts sewage no-discharge zones established under Clean Water Act Section 312. The areas depicted are zones where the discharge of any sewage, treated or untreated, from vessels is prohibited. This layer was created using information from the corresponding Federal Register notice and is created for informational purposes, not to be used for enforcement.

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