Amplified music rules in Sonoma, CA — also called sound permit, PA system, or live music ordinances — set decibel limits, time-of-day restrictions, and when permits are required.
Amplified sound directed toward a public right-of-way from a business is prohibited under SMC Chapter 9.56; outdoor amplified music at events requires a zoning/special-event permit, and ongoing amplified sound must stay within general dBA limits in SMC 9.56.040.
Sonoma Municipal Code Chapter 9.56 expressly prohibits the direction of any amplified, transmitted or recorded sound toward a public right-of-way from a business adjacent to the right-of-way — meaning bars and restaurants on the Plaza cannot aim speakers at the sidewalk or street. Live amplified music at private special events typically triggers a Special Event / Zoning Permit; applications should be submitted well in advance and must disclose duration, music, crowd size, security and alcoholic-beverage details. All amplified sound remains subject to the general dBA limits in SMC 9.56.040 (65 dBA intermittent / 55 dBA constant residential, lower at night) unless a noise variance is granted under SMC 9.56.060.
Operating without a required permit or exceeding permitted dBA levels is an infraction under SMC 9.56; recurring or aggravated violations can be prosecuted as misdemeanors under SMC 1.12 (up to $1,000 / 6 months). Police may order amplified sound shut off on the spot.
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