Amplified music rules in Rohnert Park, CA — also called sound permit, PA system, or live music ordinances — set decibel limits, time-of-day restrictions, and when permits are required.
Unincorporated Sonoma County has no dedicated amplified-music ordinance, but the General Plan Noise Element treats amplified sound as especially intrusive: stationary-source standards are reduced by 5 dBA for noise consisting primarily of speech or music. Loud amplified music can also be cited under state disturbing-the-peace law.
Sonoma County does not have a stand-alone ordinance regulating amplified music, loudspeakers or sound systems in the unincorporated area. The relevant standards come from the General Plan Noise Element. Its Table NE-2 sets maximum allowable exterior noise levels for non-transportation (stationary) sources, measured at the property line of an adjacent noise-sensitive use: during the daytime (7 a.m.–10 p.m.) the median (L50) limit is 50 dBA, rising to 65 dBA for very brief peaks (L02), and during the nighttime (10 p.m.–7 a.m.) the L50 limit drops to 45 dBA. Critically, Policy NE-1c directs the County to reduce these standards by five dBA for 'noises consisting primarily of speech or music' — recognizing that amplified music is more disturbing than its raw decibel reading suggests. These standards are applied primarily when the County reviews new projects, use permits and special-event proposals such as concerts at wineries and event venues. For spontaneous loud music from a party or business, the Sheriff enforces California Penal Code section 415, which prohibits maliciously and willfully disturbing another person by loud and unreasonable noise. Because there is no fixed countywide music curfew, persistent amplified-music problems at a permitted venue are best raised with Permit Sonoma, while one-off party noise is a Sheriff matter.
Permitted venues that exceed the General Plan stationary-source standards (reduced 5 dBA for speech/music) can be conditioned or face permit action through Permit Sonoma. Spontaneous loud amplified music is enforced by the Sheriff under Penal Code 415 (up to 90 days jail, up to $400 fine, or both).
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