Current and from the EPA site.
https://www.epa.gov/vessels-marinas-and-ports/vessel-sewage-frequently-asked-questionsWhat are the sewage discharge regulations/requirements in the United States?
Section 312 of the Clean Water Act requires the use of operable, U.S. Coast Guard-certified marine sanitation devices (MSDs) onboard vessels that are equipped with installed toilets and operating on U.S. navigable waters.
Untreated sewage discharges are prohibited within three miles from shore.
In order to discharge within three miles, sewage must be treated using a U.S. Coast Guard-approved Type I or Type II MSD. Alternatively, sewage may be stored onboard in a holding tank (Type III MSD).
Treated and untreated sewage discharges are prohibited in:
Freshwater lakes, reservoirs and other freshwater impoundments whole inlets or outlets are such as to prevent the ingress or egress by vessel traffic.
Rivers not capable of navigation by interstate vessel traffic.
No-discharge zones (NDZs) (as applicable).
In these areas, sewage effluent generally must be retained onboard in a holding tank (Type III MSD). Operators of vessels equipped with flow-through MSDs (Type I or Type II) must secure the device to prevent overboard discharge.
Visit the No-Discharge Zones (NDZs) by State webpage for more information on the location and applicability of NDZs.
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Can I discharge graywater from my vessel?
Graywater is regulated differently depending on the type of vessel and whether it is mixed with sewage effluent. Commercial and military vessels have graywater requirements under the National Pollutant Discharge Elimination Systems (NPDES) permitting regime and the Uniform National Discharge Standards, respectively. For recreational vessels, there are currently no federal rules in place regulating graywater.
For all vessels, when graywater and sewage are mixed, the resulting discharge must meet sewage effluent requirements.
