Septic soil in Boyd County, KY, by the numbers
Very limited
In Boyd County, KY, 94.1% of the surveyed land carries a "Very limited" rating for a standard septic drain field. A standard gravity system routinely fails on ground like this; the same share of the county falls in USDA's worst absorption-field bucket outright. Boyd County, KY is 159.866 square miles with a population of 47,777.
What Boyd County's reading doesn't cover
Boyd County's rating is an average across the whole county, not a promise about any one lot inside it. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Boyd County will actually do.
What a system would cost here
With 94.1% of Boyd 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, Boyd County, KY is the 768-most-constrained of 3,058 rated counties for septic soil. Within Kentucky alone it ranks 36 of 119.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems