Aircraft-in-flight noise is regulated by the FAA, not Rock County. Locally, Janesville bans helicopter or aircraft use for construction between 8:00 p.m. and 8:00 a.m. under Municipal Code section 9.42.025.
Federal law preempts most control of aircraft noise in flight, so neither Rock County nor its cities can set in-air dB limits; complaints about airport operations go to the FAA and the airport operator. Rock County operates the Southern Wisconsin Regional Airport near Janesville. One narrow local rule does exist: Janesville section 9.42.025 prohibits using or permitting any helicopter or other aircraft for construction or construction-related purposes anywhere in the City between 8:00 p.m. and 8:00 a.m. each night, except for emergencies. That targets ground-tied construction aircraft use, which is not federally preempted, rather than routine overflights.
Violating Janesville's 9.42.025 nighttime construction-aircraft ban is a municipal offense under Chapter 9.42, generally carrying a forfeiture of about $25 to $500 plus prosecution costs.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Rock County's aircraft noise rules stack up against other locations.
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