Benton County, MS's soil, for a septic absorption field

Very limited

In Benton County, MS, 99% 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. Benton County, MS is 406.616 square miles with a population of 7,566.

What Benton County's reading doesn't cover

USDA's survey covers the whole of Benton County, MS 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 Benton County will actually do.

What a system would cost here

With 99% of Benton 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.

Benton County's rank among Mississippi counties

Nationally, Benton County, MS is the 101-most-constrained of 3,058 rated counties for septic soil. Within Mississippi alone it ranks 4 of 82.

Further reading

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