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It's the Law

Mufflers and Noise Level Limits


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

All vessel engines must be equipped with an efficient muffler, underwater exhaust, or other effective muffling device that prevents excessive or unusual noise.

A vessel operating on Arizona’s public waters must not exceed any of the following noise levels:

  • A noise level of 86 dBA when the sound level is measured at 50 feet or more from the vessel
  • For an engine manufactured before January 1, 1993, a noise level of 90 dBA when the stationary sound level test (SAEJ2005) is performed
  • For an engine manufactured on or after January 1, 1993, a noise level of 88 dBA when the stationary sound level test (SAEJ2005) is performed
  • A noise level of 75 dBA when the shoreline sound level test (SAEJ1970) is performed