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 (SAE J-2005) is performed
  • For an engine manufactured on or after January 1, 1993, a noise level of 88 dBA when the stationary sound level test (SAE J-2005) is performed
  • A noise level of 75 dBA when the shoreline sound level test (SAE J-1970) is performed