How Rutherford County might count wastewater and soils when calculating subdivision density

Aug 10, 2026

Aaron Holmes explained Williamson County treats step (nontraditional) wastewater acreage as a separate use that is removed from the gross parent parcel when calculating buildable area and density; subdivisions must hold reserve soils even when tying into regional systems.

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Williamson County planning director Aaron Holmes told Rutherford County planners that when a conservation subdivision uses a nontraditional or 'step' wastewater system, the acreage dedicated to soils and wastewater infrastructure is removed from the parent parcel before calculating allowable density. "So if they have a 100 acres, for example, they have 10 acres of wastewater, they only get to develop 90 acres of that, and that's what we base the density off of," Holmes said.

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