Septic System Cost in Washington (2026)
Compare septic system costs across 1 city in Washington. Prices range from $9,200 in Seattle to $9,200 in Seattle.
State average
$9,200
Range
$9,200 – $9,200
Cities tracked
1
City comparison
| City | Avg cost | Budget range | High-end range | vs state avg |
|---|---|---|---|---|
| Seattle, WA | $9,200 | $3,300–$4,000 | $19,800–$25,300 | 0% |
Explore each city
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Frequently asked questions
The average septic system in Washington costs $9,200. Prices range from $9,200 in Seattle to $9,200 in Seattle. Costs vary by city due to differences in labor rates, material availability, and local code requirements.