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

24 does not use the word "alarm," but its horn-and-siren clause squarely reaches what a car alarm does: it sounds the vehicle's horn or siren. 010(B)(2) lists sounds created by a horn or siren attached to a motor vehicle as a public noise disturbance, carving out only sounds that warn of danger or are specifically permitted or required by law, such as a horn used to avoid a collision. A car alarm that repeatedly sets off the horn on a false or nuisance trigger falls outside that danger-warning exception once it stops functioning as a genuine warning.

010(A) still applies too: any sound from property in a person's possession that creates a "noise disturbance" is independently unlawful, so a parked vehicle with a malfunctioning alarm can be cited under either clause. 020, covering aircraft, emergency equipment, parades and similar categories, mentions vehicle alarms or horns, so there is no separate safe harbor for a car alarm beyond the danger-warning exception written into (B)(2) itself. Enforcement is countywide within the unincorporated area and runs through the Sheriff's Office, which can issue a citation directly or refer the matter for a civil infraction in Franklin County District Court.