Kootenai County directly regulates watercraft noise: county code 6.2.105 requires every motorboat on county waters to have a working muffler and prohibits cutouts or exhaust amplifiers. Idaho Code 67-7038 caps boat noise at 88 dBA. On-road vehicle noise falls under Idaho muffler law and disturbing-the-peace.
For the county's many lakes, Kootenai County Code 6.2.105 (Control of Noise from Motor Driven Watercraft) makes it unlawful to operate a motorboat without a muffler or muffler system in good working order and constant operation, and bans altered mufflers, cutouts, bypasses and exhaust-amplifying devices. Idaho Code 67-7038 sets a stationary-test limit of 88 dBA for boats built on or after January 1, 1995 (90 dBA if earlier) and 75 dBA on lakes over 500 feet wide. Loud cars on public roads are governed by Idaho muffler law (49-937) plus disturbing-the-peace; cities may add exhaust-noise chapters.
Under county code 6.2.105, a first and second watercraft-noise offense within a year is an infraction; a third within a year is a misdemeanor. Officers may order an on-site noise test.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Kootenai County, ID
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See how Kootenai County's vehicle noise rules stack up against other locations.
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