How Long Does a Septic System Last? (2026 Data)

Septic system lifespan in 2026: tanks 20–40 yrs, drain fields 15–25 yrs. What shortens it, what extends it, and the signs of failure.

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HomeScore forecasts repairs, replacement timing, and total ownership cost across 40+ home systems. Used by 8,200+ buyers, sellers, and long-term homeowners in 2026.