Issaquah, WA Noise Ordinances: Quiet Hours (2026)

The only nighttime hours printed in Issaquah's public disturbance noise section appear in subsection C of IMC 9.22.010. It lists "Yelling, shouting, hooting, whistling or singing on or near the public streets, particularly between the hours of 11:00 p.m. and 7:00 a.m. or at any time and place so as to unreasonably disturb or interfere with the peace, comfort and repose of owners or possessors of real property." The word particularly marks the overnight window as the time of greatest concern, but the clause continues to reach any time and place where the noise is unreasonably disturbing. The 11:00 p.m. to 7:00 a.m. span is therefore a emphasis, not a safe harbor before 11:00 p.m. and not an automatic violation after it.

The subsection covers voice-type noise near public streets. Sound from buildings, audio systems, vehicles and animals is handled in other lettered items of the same section, each with its own standard of frequent, repetitive or continuous sound that unreasonably interferes with the peace, comfort and repose of owners or possessors. The lead sentence applies the prohibition both to the person who makes the sound and to a person in possession of property who allows it to originate there. The closing proviso adds that the enumeration does not exclude other acts and noises which offend the public peace.

A fixed hourly schedule does exist for one noise source. IMC 16.35.010(A) restricts nonemergency construction activity under approved permits to between the hours of 7:00 a.m. and 6:00 p.m. on weekdays, and bars it on weekdays that are legal holidays. Expanded work hours need an application and approval by the Development Services Director or the Director of Public Works Engineering under 16.35.010(B), with the fee in the Land Use and Site Work Fee Schedule.