Commission debates 15,000 sq. ft. minimum and engineered septic systems in subdivision rules

May 21, 2026

Commissioners discussed a proposed minimum lot size (15,000 sq. ft.) for subdivisions in unincorporated Saint Clair County, concerns about reliance on engineered/injection septic systems, grandfathering standards for in‑progress developments, and tools such as cash bonds to ensure maintenance and remedy of failures.

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Commissioners spent significant time examining draft subdivision regulations and how to address modern, engineered septic systems. Chair (speaker 1) said the county must consider requirements that ensure long‑term functionality and avoid leaving the county to remediate failed systems. “If it fails, who fixes it?” the Chair asked, underscoring the central worry that state‑approved engineered systems with discharge permits might create future liabilities for the county and neighboring communities.

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