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  • Excavation crew installing a residential septic system near Underwood, MN
    September 22, 2026

    Septic Tank Replacement in Underwood, MN: When It's Time and What It Costs

    Most homeowners in Underwood, MN pay roughly $4,500 to $12,000 to replace a septic tank, with the wide spread driven by tank size, tank material, site access, and whether the drain field has to be replaced at the same time. If your tank is a single-compartment steel tank, is more than 25 to 30 years old, or is backing up despite regular pumping, replacement is usually the right call rather than another repair. In Otter Tail County, a septic tank replacement is a permitted project that requires a licensed installer and, in most cases, a soil and site evaluation before work begins.

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