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Seattle, WA sits on glacial till and clay west of the Cascades and has a wet marine climate with about 38–48" of rain a year west of the mountains. The local water table is high through the long wet season, with mild winter freeze–thaw cycling, and many homes have daylight basements on sloped lots. In practical terms, a long, wet season and high water tables make drainage and waterproofing a constant concern — which is exactly why septic system service is a common need here.
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Seattle sits on glacial till and clay west of the Cascades with a wet marine climate with about 38–48" of rain a year west of the mountains. A long, wet season and high water tables make drainage and waterproofing a constant concern. That combination makes septic system service a recurring need for Seattle homeowners.
Local projects typically run $1,350 – $16,100, tracking Seattle-area labor and material prices. Difficult sites — for example where glacial till and clay west of the Cascades is severe — can run higher. Always compare at least two local quotes.
Pumping runs a few hundred dollars; repairs $1,500–$5,000; a full new system $5,000–$12,000+ depending on soil, size, and local code. Get a percolation test before a new install.
Typically every 3–5 years, depending on tank size and household use. Skipping it risks backups and costly drain-field failure.
Slow drains, sewage smells, soggy spots over the drain field, or gurgling pipes. Act early — drain-field replacement is the most expensive repair.
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