Amplified music rules in Multnomah County, OR — also called sound permit, PA system, or live music ordinances — set decibel limits, time-of-day restrictions, and when permits are required.
Multnomah County defers to city noise codes. Portland requires a Noise Variance through the Noise Control Office for any amplified sound audible beyond property lines, governed by PCC 18.02 and 18.10. Gresham and other cities require special event permits for outdoor amplification. Base state authority comes from ORS 467 and OAR 340-035, with decibel limits measured at the nearest noise-sensitive property.
Amplified music in Multnomah County is regulated primarily by the city in which the event occurs. Portland City Code Chapter 18.10 (Noise Control) prohibits sound that exceeds 55 dBA daytime / 50 dBA nighttime at a residential property line, or any amplified sound that is 'plainly audible' from more than 100 feet. Portland's Noise Review Board (PCC 18.04) issues variances for concerts, festivals, and construction through the Noise Control Officer, typically $185 to $900 depending on duration. Gresham Municipal Code Chapter 7.80 and Troutdale's noise ordinance similarly require special event permits with noise conditions. In unincorporated Multnomah County, MCC Chapter 15 and the Oregon DEQ framework OAR 340-035-0035 apply, using measurements at the nearest noise-sensitive receptor (residence, school, church, hospital). ORS 467.010 to 467.130 provides underlying state authority for nuisance noise enforcement. Commercial venues with liquor licenses must also comply with OLCC noise-related conditions, and recurring violations can trigger Good Neighbor Agreement reviews. Live music in parks managed by Portland Parks & Recreation requires a Special Use Permit under PCC 20.08.
Portland noise violations: $500 first offense, up to $3,000 for repeat offenders under PCC 18.12.040. Amplified sound without variance: $185 to $900 plus equipment impoundment authority. Gresham violations: $100 to $1,000 per day as Class A violation. OLCC liquor license impact for bar/venue violations.
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