Ontario, CA Noise from Specific Sources: Bar & Nightclub Noise (2026)

Establishments serving alcohol with live or DJ music in unincorporated San Bernardino County operate under multiple overlapping regulations: (1) Title 8 Division 3 exterior noise limits at the nearest residential property line (typically 45 dBA after 10 PM); (2) Conditional Use Permit (CUP) conditions from the county Planning Division, which usually include specific noise limits, hours for outdoor patio use, door/window closure rules during amplified music, and security plans; (3) California Department of Alcoholic Beverage Control (ABC) licensing, with Business and Professions Code 25612.5 making patron conduct problems (noise from patrons loitering in the parking lot after closing) a licensee responsibility; (4) patio and outdoor speaker rules typically limiting amplified outdoor speakers to end by 10 PM. Rancho Cucamonga, Chino Hills, Redlands, and Yucaipa each set additional city-level rules within their incorporated boundaries. Complaint patterns concentrate around closing time (1:30-2:30 AM) with crowd dispersal noise, car doors, engine revving, and amplified music bleeding from open doors. Repeat violators face CUP revocation hearings and ABC disciplinary action. County Sheriff ABC Liaison and code enforcement work jointly on these cases.