Mason County, WA Public Conduct: Loud Party Ordinance (2026)

Section 9.36.120, 'Public disturbance noises,' opens by making it unlawful for any person in possession of real or personal property to cause or allow sound that is a public disturbance noise to originate from that property. Subsection (6) specifically targets residential parties: it bans the creation, by use of a musical instrument, whistle, sound amplifier, radio, stereo, television or other device capable of producing or reproducing loud and raucous sounds, of sound that emanates frequently, repetitively or continuously from any building, structure or property located within a residential area, and the section names sounds originating from a band session or social gathering as an example.

Unlike the Section 9.36.060 decibel table, this provision does not turn on a measured dBA number; it turns on whether the sound is loud and raucous and recurring. Section 9.36.110's proviso confirms that compliance with, or exemption from, the numeric noise levels elsewhere in the chapter is no defense to a Section 9.36.120 prosecution, so a host cannot argue a party stayed under the EDNA decibel cap as a shield. Enforcement rests with the Mason County Sheriff's Office under the 24-hour administration directed by Section 9.36.020's findings.