Septic permits in Jefferson County, MO
The rules, the agency, and what happens before anyone can dig.
Requirements
Jefferson County (Hillsboro, De Soto, Festus) has its own onsite wastewater ordinance covering unincorporated land, incorporated cities within the county may permit separately, so confirm which applies to your parcel before designing. The ordinance covers building sewers, septic tanks, subsurface absorption systems, mound systems, intermittent sand filters, gravelless systems, aeration treatment units, and single-family stabilization ponds. A permit to construct is issued by the county health department before the building permit and installation proceed. Because fee schedules change, confirm current amounts directly with the county health department rather than relying on third-party summaries.
Source: ecode360.com . Rules change; confirm with the agency before starting work.
These are the county-level specifics. For the full permit process, soil-test rules, and installer licensing that apply across the state, see the Missouri septic permit guide.
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