Septic permits in St. Charles County, MO
The rules, the agency, and what happens before anyone can dig.
Requirements
St. Charles County regulates onsite systems through the Division of Building and Code Enforcement, not a health department, covering unincorporated areas plus jurisdictions the county contracts with (636-949-7345, bce@sccmo.org). More than 7,800 properties in the county are on septic. A permit is required for installation, alteration, expansion, or repair. The rule that catches buyers and builders: parcels for a new private sewage disposal system must contain at least three acres per dwelling unit, with smaller existing parcels approved only case-by-case by Building and Code Enforcement. The county also runs programs verifying system condition at property transfer and monitoring ongoing maintenance of existing systems.
Source: www.sccmo.org . 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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