Issaquah, WA Public Conduct: Loud Party Ordinance (2026)

The party rule is item D of IMC 9.22.010, Public disturbance noises – Restriction. The section's lead sentence makes it unlawful for any person to cause, or for any person in possession of property to allow to originate from the property, sound that is a public disturbance noise. That is the host-liability hook: the resident, tenant or owner in possession of the home where a gathering takes place can be responsible for the sound that comes out of it, even if guests rather than the host produce it.

Subsection D describes the sound as "frequent, repetitive or continuous sounds which emanate from any building, structure, apartment or condominium, which unreasonably interferes with the peace, comfort and repose of owners or possessors of real property." It then gives examples: "sounds from musical instruments, audio sound systems, band sessions or social gatherings." Social gatherings are named outright, so a party does not need to involve amplified music to fall within the rule; shouting and crowd noise from the gathering count when they meet the frequency and interference tests. The code prints no decibel limit and no fixed end time for parties, so the question is whether the sound is frequent, repetitive or continuous and whether it unreasonably disturbs the neighbors.

Subsection C separately addresses yelling, shouting, hooting, whistling or singing on or near the public streets, particularly between 11:00 p.m. and 7:00 a.m., which is the provision that applies to a crowd spilling into the street. Subsection E and H add a 50-foot audibility test for vehicle and portable audio equipment. The proviso at the end of the section says the list does not exclude other acts and noises which offend the public peace.