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Denver, CO sits on highly expansive bentonite and clay soils and has a semi-arid climate with about 15–20" of precipitation a year. The local water table is generally low, but expansive soils move sharply with moisture, with significant winter freeze–thaw cycling, and full basements are standard along the Front Range. In practical terms, expansive bentonite clay is a notorious cause of heaving and foundation damage here — which is exactly why septic system service is a common need here.
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Denver sits on highly expansive bentonite and clay soils with a semi-arid climate with about 15–20" of precipitation a year. Expansive bentonite clay is a notorious cause of heaving and foundation damage here. That combination makes septic system service a recurring need for Denver homeowners.
Local projects typically run $1,150 – $13,800, tracking Denver-area labor and material prices. Difficult sites — for example where highly expansive bentonite and clay soils 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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