The Handbook of Missouri Boating Laws and Responsibilities
The Official Boating Handbook of the Missouri State Highway Patrol, Water Patrol Division - Web Version
Table of Contents
Houseboats must have a waste-water holding system to prevent the discharge of waste into surrounding waters. Missouri law prohibits the discharge of any sewage, treated or untreated, into the state’s freshwaters.
If you have a recreational vessel with installed toilet facilities, it must have an operable marine sanitation device (MSD) on board. All installed devices must be USCG–certified and working properly.
Type I and II MSDs must have the Y valve secured so that waste cannot be discharged into the water.
Types of MSDs
A Type III MSD, the simplest and most common, consists of holding tanks or portable toilets. Waste is to be discharged onshore into a pump-out facility.
Types I and II MSDs are usually found on large vessels. Waste is treated with special chemicals to kill bacteria.