Septic service in Washington

SepticTank.com covers 205 cities and towns in Washington, home to about 5,091,364 people. The largest are Seattle, Spokane and Tacoma.

Soil and climate differ across Washington. In the 205 cities with local data so far, a median of 96% of nearby mapped soils are rated very limited for septic absorption fields, and yearly precipitation ranges from about 10 to 83 inches. Each city page shows the figures for that area.

Septic permits in Washington are handled by state and county health or environmental agencies. Check with your county before installing, replacing or making major repairs to a system, and ask your septic company which rules apply to your property.