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It's the Law

Mufflers and Noise Level Limits

The exhaust of every internal combustion engine on any vessel must be effectively muffled by a muffler or underwater exhaust. That is, the engine’s exhaust must be muffled or suppressed at all times so as not to create excessive noise.

The use of cutouts is prohibited.

It is illegal to remove or modify the exhaust or muffler system of a vessel.

Vessels involved in a marine event authorized by the Massachusetts Environmental Police are exempt from the requirements above.