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Septic System Costs in Washington (2026)

Based on BLS wage data, septic system in Washington costs an average of $10,068, ranging from $9,638 to $10,566.

Washington Average $10,068

Septic System Costs by City in Washington

Seattle $9,638 Spokane $9,971 Tacoma $10,100 Bellevue $10,566

Compare Septic System Costs in Nearby States

VermontVirginiaWest VirginiaWisconsin
Alex - Founder

Reviewed by

Alex Johnson, P.E.

Mechanical Engineer • 15+ Years Home Repair Experience • Licensed Contractor

All cost data on this page has been verified against BLS and Census Bureau records. See our methodology →

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