Amplified music rules in Jefferson County, CO — also called sound permit, PA system, or live music ordinances — set decibel limits, time-of-day restrictions, and when permits are required.
Amplified music is regulated as any noise-making "activity." In a residential zone it may not exceed 55 dB(A) (day) or 50 dB(A) (night) at 25 feet from a property line, with a lower cap for shrill or pulsing sound.
Jefferson County's Noise Abatement Policy prohibits carrying on any activity, or promoting or facilitating any activity, that makes sound above the permissive levels. Amplified stereos, PA systems, and band equipment therefore must meet the 55/50 dB(A) residential limits. Periodic, impulsive, or shrill noise (which describes heavy bass) is unlawful at 5 dB(A) below those figures, i.e. 50 dB(A) day / 45 dB(A) night. A short 10 dB(A) boost is allowed for up to 15 minutes per hour during daytime.
Class 2 Petty Offense; $30 fine per offense, escalating $30 each recurrence to a $300 maximum, plus court costs.
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