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Handbook of Illinois Boating Laws and Responsibilities Illinois Department of Natural Resources

It's the Law: On the Water

Discharge of Sewage and Waste (625 ILCS 45/4-9)

Pumpout Station sign

Signs like these are posted at marine sanitation pump-out stations in Illinois.

MSD and Pump-Out Station Diagram

Illinois law states that it is unlawful to discharge any sewage into Illinois waters directly or indirectly.

Federal law requires that every vessel with an installed toilet must have an operable U.S. Coast Guard–certified marine sanitation device (MSD) Type I, II, or III.

The types of MSDs are:

  • Type III MSD, the simplest and most common, consists of holding tanks or portable toilets. It requires only a small storage space and is simple to operate. Type III MSDs have the least effect on the environment since the waste is to be discharged on shore into a local sewage treatment facility or at a sewage pump-out station.
  • Types I and II MSDs treat waste with special chemicals to kill bacteria before the waste is discharged. Types I and II MSDs with “Y” valves that direct the waste overboard must be secured so that the valve cannot be opened. This can be done by placing a lock or non-reusable seal on the “Y” valve or by taking the handle off the “Y” valve.

All installed MSDs must be U.S. Coast Guard–certified.

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It's the Law!

Handbook of Illinois Boating Laws and Responsibilities
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Online boating safety handbook last modified: April 22, 2008
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