An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Factsheet for the California No-Discharge Zone Prohibiting Vessel Sewage in all California Marine Waters

This factsheet describes the California no-discharge zone established for all California marine waters, which went into effect in March 2012. It includes background information, frequently asked questions (FAQs) and a map of California no-discharge zones. The factsheet also briefly describes California marine waters, holding tanks, gross tonnage and enforcement.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.