Hart County, KY: the USDA septic-suitability picture
Very limited
Hart County, KY: USDA's soil survey calls 62.9% of the county "Very limited" for a septic leach field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 62.9% of Hart County's land. The county spans 412.67 square miles, home to 19,923 people.
What this number does and doesn't tell you
USDA's survey covers the whole of Hart County, KY at once, not any single address. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Hart County: conventional vs. engineered cost
62.9% of Hart County carrying a "Very limited" reading changes the realistic budget here. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.
Hart County's rank among Kentucky counties
Among the 3,058 rated counties on this site, Hart County, KY ranks 2,665 most-constrained nationally, and 110 of 119 within Kentucky.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems