Mason County, WA Noise from Specific Sources: Car Alarm Limits (2026)

Section 9.36.120 lists public disturbance noises that are unlawful regardless of the EDNA decibel table in Section 9.36.060. Subsection (2) targets vehicle horns, sirens and, by extension, the kind of repeating alarm system that sounds a horn: it prohibits the frequent, repetitive or continuous sounding of any horn or siren attached to a motor vehicle, except as a warning of danger or as specifically permitted or required by law. The exception preserves genuine warning uses, a horn sounded to avoid a collision, or a security or law-enforcement siren, while reaching a car alarm that cycles repeatedly in a driveway or parking lot without stopping.

Because this is a public disturbance provision rather than a decibel standard, Section 9.36.110's proviso applies here too: an alarm's loudness relative to the Section 9.36.060 table is irrelevant if its repetition itself is the disturbance. The Mason County Sheriff's Office, directed by Section 9.36.020 to administer noise complaints around the clock, is the enforcing agency, and Section 9.36.030 defines 'officer' for this purpose as the sheriff, a deputy, or any other law enforcement officer.