Blount County, TN's soil, for a septic absorption field

Very limited

Soil across 69.7% of Blount County, TN rates "Very limited" in USDA's septic-absorption-field interpretation. That reading means a conventional system is a poor bet here - 69.7% of Blount County lands in the strictest "very limited" bucket USDA uses. Blount County, TN is 558.844 square miles with a population of 142,211.

What Blount County's reading doesn't cover

USDA's survey covers the whole of Blount 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 Blount County will actually do.

What a system would cost here

With 69.7% of Blount 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.

Blount County's rank among Tennessee counties

Nationally, Blount County, TN is the 2,469-most-constrained of 3,058 rated counties for septic soil. Within Tennessee alone it ranks 78 of 95.

Further reading

How this rating is built, and its real limits · Conventional vs. engineered septic systems