Generator noise falls under CMC Chapter 909. Portable and standby generators are restricted 9 PM to 7 AM within 500 feet of residences without a permit. Emergency use during power outages is exempt.
Generator noise in Cincinnati is governed by the general community noise provisions of CMC Chapter 909. Section 909-3 sets maximum permissible sound levels by zoning district, and generators must not exceed these levels as measured at the receiving property. Section 909-7 prohibits operation of mechanical, electrical, or battery-operated apparatus that produces loud sound disturbing the peace within 500 feet of residences, hospitals, or other residential institutions between 9 PM and 7 AM without a special permit from the Director of Buildings and Inspections or City Engineer. Emergency generators activated during power outages are generally exempt under the emergency exception in Section 909-7, but routine testing of standby generators should be scheduled during daytime hours. Commercial and industrial backup generators must also comply with Cincinnati zoning code placement requirements and may need building permits. Portable construction generators fall under the construction noise provisions and are restricted to the same 9 PM-7 AM prohibition near residences.
Minor misdemeanor for first offense under Section 909-3 or 909-7. Emergency use is exempt. Repeated violations (three or more in one year) may be charged as a fourth-degree misdemeanor. Report generator noise to Cincinnati 311 at (513) 591-6000.
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