Mufflers and Noise Level Limits
Vessel operators may not hear sound signals or voices if the engine is not adequately muffled.
- A vessel's engine must have a muffler or exhaust water manifold for noise reduction or another effective muffling system.
- The use of cut-outs or exhaust stacks is prohibited.
- It is illegal to operate a powerboat or PWC, or allow others to operate, in such a manner that the noise level exceeds 86 decibels as measured by the Society of Automotive Engineers (SAE) Stationary Sound Level Measurement Procedures SEAJ2005 or as measured by the SAE Shoreline Sound Level Measurement Procedure SAEJ1970 at 50 feet from the vessel. You must submit to a noise level test if requested by a law enforcement officer.
- It is illegal for recreational boaters to use or have on board a siren of any type while operating on the waters of Alabama.