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Official Michigan Boating Handbook Michigan Department of Natural Resources

It's the Law: On the Water

Discharge of Oil and Other Hazardous Substances

  • Oil Discharge Prohibited PlacardIt is illegal to discharge oil or hazardous substances.
  • You are not allowed to dump oil into the bilge of the vessel without means for proper disposal.
  • You must discharge oil waste to a reception facility. On recreational vessels, a bucket or bailer is adequate for temporary storage.
  • If your vessel is 26 feet or longer, you must display a 5 x 8-inch placard at the bilge pump control station, stating the Federal Water Pollution Control Act's law.

Discharge of Waste

  • MSD and Pump-Out Station DiagramHouseboats must have a waste-water holding system to prevent the discharge of waste into the water. Michigan law prohibits discharge of any sewage, treated or untreated, into the fresh waters of Michigan.
  • 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 U.S. Coast Guard—certified.

Types of MSDs

There are three types of MSDs.

  • Types I and II MSDs are usually found on large boats. Waste is treated with special chemicals to kill bacteria. The "Y" valve must be secured so that waste cannot be discharged into the water.
  • Type III MSDs, the simplest and most common,
    consist of holding tanks or portable toilets. Waste is to be taken ashore and discharged into a pump-out facility.

Discharge of Trash

It is illegal to dump refuse, garbage, or plastics into any state or federally controlled waters. Many forms of litter can kill birds, fish, and marine mammals.

  • You must store trash in a container while on board and place it in a proper receptacle after returning to shore.
  • If boating on federally controlled waters and your vessel is 26 feet or longer, you must display a Garbage Disposal Placard that is at least 4 x 9 inches and notifies passengers and crew about discharge restrictions.

MARPOL trash placard

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Online boating safety handbook last modified: April 22, 2008
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