Unincorporated Orange County establishes decibel thresholds under Title 4, Division 6 of the Codified Ordinances. Residential zones have lower allowable noise levels than commercial or industrial zones, with separate daytime and nighttime standards.
Title 4, Division 6 of the Orange County Codified Ordinances sets noise standards for unincorporated areas. Residential zones typically have lower permissible noise levels (approximately 55 dBA daytime, 50 dBA nighttime) measured at the property line of the receiving property. Commercial and industrial zones have higher thresholds. Noise is measured using A-weighted sound level meters. Adjustments may apply for tonal, impulsive, or repetitive noise characteristics. Construction noise during permitted hours is generally exempt from decibel limits. Emergency equipment, agricultural operations, and public safety activities have additional exemptions. OC Code Enforcement uses sound level meters to document violations. Complaints should be filed with OC Code Enforcement at (714) 667-8843.
Exceeding decibel limits at the property line is a code violation. First offenses typically receive a warning and compliance order. Repeat violations carry administrative fines. Code Enforcement at (714) 667-8843 documents violations with calibrated sound meters.
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