Septic soil in Butler County, KY, by the numbers
Very limited
In Butler County, KY, 89.2% of the surveyed land carries a "Very limited" rating for a standard septic drain field. That reading means a conventional system is a poor bet here - 89.2% of Butler County lands in the strictest "very limited" bucket USDA uses. Butler County, KY is 426.112 square miles with a population of 12,551.
What Butler County's reading doesn't cover
Nothing about Butler County, KY's SSURGO figure applies to a specific address - it's a county-wide average. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Butler County will actually do.
What a system would cost here
With 89.2% of Butler County rating "Very limited", a standard gravity system is not a safe assumption here. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.
Where this sits nationally
Nationally, Butler County, KY is the 1,358-most-constrained of 3,058 rated counties for septic soil. Within Kentucky alone it ranks 66 of 119.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems