Marine Sanitation Devices: 33 CFR Part 159
US marine sanitation device rules in 33 CFR Part 159 under Clean Water Act section 312, applying to vessel sewage because the US is not party to MARPOL Annex IV.
Marine sanitation devices (MSDs) are regulated in the United States under section 312 of the Clean Water Act and the US Coast Guard rules in 33 CFR Part 159. The US Environmental Protection Agency states that the United States is not a party to MARPOL Annex IV , so these national rules, not the International Sewage Pollution Prevention Certificate, govern vessel sewage in US waters.
The full article will cover MSD types, certification, no-discharge zones, application to foreign ships, and the contrast with Annex IV Regulation 14 port State control.