The King County Housing Authority has a weatherization program to improve energy efficiency and air quality in housing. The program is available to income-qualified renters and homeowners, as well as eligible and owners/managers of apartment buildings.
Other helpful information:
The Washington State Department of Labor and Industries has information on how to protect yourself when hiring a contractor, including online services to look up contractors, electricians, and plumbers to check for licenses or infractions.
HUD's Healthy Homes provides information about lead paint as well as mold and moisture problems.