Washington noise rules
The Seattle page below is taken from that city's own code. It lists its sources and the date we checked them.
What does Washington law say about noise?
- Home limits
- Washington rule WAC 173-60-040 limits noise that crosses onto another person's property. Class A land is where people live and sleep, including houses (WAC 173-60-030). Noise from one Class A property onto another is limited to 55 dBA. From 10 p.m. to 7 a.m. that limit drops by 10 dBA. The rule allows short peaks above those levels.
Source: WAC 173-60-040, Maximum permissible noise levels, WAC 173-60-030, Identification of environments. City rules are usually more specific, so check your city's page too.