Commission preserves 10‑lot threshold, keeps average 3‑acre guidance for small subdivisions

Oct 20, 2026

Commissioners kept proposed language requiring smaller subdivisions that rely on on-site wastewater to average about 3 acres per lot and approved a prohibition on aerobic systems for subdivisions of 10 or more lots; commissioners asked staff to clarify language referencing zoning-district minimums.

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As part of its review of section 153.305, the commission discussed lot-size and density controls intended to reduce the proliferation of on-site aerobic systems in areas with fragile soils or high water tables. Commissioners left in place a proposal that subdivisions of fewer than 10 lots relying on on-site treatment should have lots that average three acres; they also voted to prohibit subdivisions of 10 or more lots from being served by on-site aerobic systems.

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