What Marshall County, KY's soil rates for a septic system

Very limited

81.5% of Marshall County, KY's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. That reading means a conventional system is a poor bet here - 81.5% of Marshall County lands in the strictest "very limited" bucket USDA uses. Marshall County, KY is 302.126 square miles with a population of 31,734.

What Marshall County's reading doesn't cover

Two lots a mile apart in Marshall County can carry different soil, even though they share one countywide rating. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Marshall County will actually do.

What a system would cost here

With 81.5% of Marshall 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, Marshall County, KY is the 1,966-most-constrained of 3,058 rated counties for septic soil. Within Kentucky alone it ranks 87 of 119.

Before you act on this

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