Direct answer
Conventional systems typically don't require it. Aerobic systems serving sensitive watersheds (close to streams or wells) may require quarterly NH3, BOD, and TSS testing under Ohio EPA permits.
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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