Direct answer
A properly maintained drain field lasts 25-50 years. Premature failure (under 15 years) usually traces to overload, biomat from infrequent pumping, root intrusion, or sub-grade soil conditions.
Authoritative sources
- US EPA SepticSmart ↗
EPA-recommended pumping schedules and inspection cadence for residential septic systems.
- Hamilton County Public Health ↗
County health department oversight of septic permits and inspections in Hamilton County, OH.
- Warren County Combined Health District ↗
Permit authority for septic installation and replacement in Warren County, OH.
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