While operating your powerboat on California inland and coastal waters up to one mile from shore, it must be equipped with a muffler. Otherwise, you must have a means to prevent it from exceeding the noise levels listed below when they are measured by the Stationary Sound Level Measurement.
Excessive noise levels measured at a distance of 50 feet from the motorboat are described as more than:
Noise levels measured from the Shoreline Sound Level Measurement Test should not exceed:
No motorboat exhaust systems can exceed these noise levels.
When exhaust pipes are not equipped with a baffling device, authorities generally agree that they do not meet the standards listed above.