Amplified outdoor music in Rialto is regulated under Municipal Code Title 9 Ch. 9.50 (Noise Control). Sound must not exceed the receiving-property decibel limit and is generally prohibited from being plainly audible at a residential property line between 10:00 pm and 7:00 am. Commercial venues and special events require a permit; alcohol-served outdoor entertainment also triggers ABC conditional licensing.
Ch. 9.50 treats amplified music as a regulated noise source: must comply with the same receiving-property exterior limits (typically 55 dBA night at a residential receptor). The chapter also commonly includes a 'plainly audible at 50 feet' or 'at the property line' standard for amplified sound after the nighttime cutoff. Outdoor concerts, weddings, and bar patios at commercial premises require either a Special Event Permit through the city or compliance with conditional use permit conditions in Title 18 Zoning. State ABC Act (Bus. & Prof. Code §25612.5) imposes additional noise-related conditions on Type 47/48 licensees serving alcohol.
Infraction first offense ($100 max); misdemeanor on repeat or willful violations (up to $1,000 / 6 months under Cal. Penal Code §19). Police may seize amplification equipment used in repeat violations under nuisance abatement.
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