The City of Orange uses A-weighted decibel (dBA) measurements at slow response under OMC Chapter 8.24 to evaluate noise complaints. Noise that disturbs the comfort and repose of reasonable persons is prohibited regardless of decibel level.
Under OMC Chapter 8.24, noise levels are measured as A-weighted sound pressure levels in decibels (dBA) obtained using a sound level meter at slow response with a reference pressure of 20 micronewtons per square meter. The ordinance establishes a reasonableness standard rather than specific decibel limits for most noise sources. A prima facie violation exists when power tools, radios, amplifiers, or similar devices are audible from 100 feet of the property line between 10 PM and 7 AM. Property maintenance equipment is restricted to 7 AM to 8 PM (9 AM on Sundays/holidays). Leaf blowers have a specific 70 dBA limit at 50 feet. For commercial or industrial noise, the city may require sound studies demonstrating compliance with applicable noise standards established in the General Plan.
Noise exceeding reasonable levels or violating specific standards is subject to citations and fines under OMC Chapter 8.24.
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