Campbell County, TN's soil, for a septic absorption field
Very limited
In Campbell County, TN, 90.2% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 90.2% of the county. Campbell County, TN is 480.19 square miles with a population of 40,238.
What Campbell County's reading doesn't cover
USDA's survey covers the whole of Campbell County, TN at once, not any single address. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Campbell County will actually do.
What a system would cost here
With 90.2% of Campbell 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, Campbell County, TN is the 1,245-most-constrained of 3,058 rated counties for septic soil. Within Tennessee alone it ranks 20 of 95.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems