Rock County sets no numeric decibel limit, and Wisconsin has no statewide dB standard. Noise is judged by a nuisance test: whether it is 'unnecessary and annoying' or 'loud or raucous,' as in Janesville's Municipal Code 9.42.020.
Neither Rock County nor the state of Wisconsin adopts a measured decibel ceiling for general noise. Enforcement instead uses a plain-language nuisance standard. Janesville's section 9.42.020 prohibits 'any unnecessary and annoying noise' and loud or raucous amplified sound, judged by an officer rather than a meter. Beloit and the unincorporated towns likewise rely on descriptive nuisance language, not dB tables. The statewide backstop, Wis. Stat. 947.01, punishes 'unreasonably loud' conduct that tends to provoke a disturbance. If you want a numeric standard, check whether your specific city adopted one; most in Rock County have not.
Because the test is nuisance-based, officers cite under local disturbing-the-peace ordinances (about $25 to $500 in Janesville) or the state disorderly-conduct law, a Class B misdemeanor up to $1,000 and 90 days.
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