Mufflers and Noise Level Limits

Vessel operators may not hear sound signals or voices if the engine is not adequately muffled.

• All vessels manufactured after January 1, 1990, operating on Maryland waters must be equipped with a muffler system in good working order and in constant operation to suppress engine noise.
• You may not remove or modify a muffler or muffling system if the result is an increase in noise level.
• No person may operate a vessel that emits noise in excess of 90 dB(A) on Maryland waters.
• Vessels involved in a marine event approved by the USCG or the MDNR are exempt from the requirements above.