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It's the Law

Mufflers and Noise Level Limits


All vessel engines must be equipped with an effective muffling device or underwater exhaust.

The noise level of any motorized vessel must not exceed these limits.

Stationary test limit:

  • 90 decibels for engines manufactured prior to January 1, 1991
  • 88 decibels for engines manufactured on or after January 1, 1991

Moving test limit as measured on the A scale and from a distance of 50 feet:

  • 84 decibels for engines manufactured prior to January 1, 1991
  • 82 decibels for engines manufactured on or after January 1, 1991

A vessel may be equipped with a switchable device that will reduce the exhaust noise level in compliance with the decibel limits.