Septic soil in Winston County, MS, by the numbers

Very limited

In Winston County, MS, 94.2% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Practically, that rules out a simple gravity system for most of the county - 94.2% of it sits in USDA's most-constrained bucket. Winston County, MS is 607.251 square miles with a population of 17,418.

What Winston County's reading doesn't cover

Two lots a mile apart in Winston 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 Winston County will actually do.

What a system would cost here

With 94.2% of Winston 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.

Winston County's rank among Mississippi counties

Nationally, Winston County, MS is the 759-most-constrained of 3,058 rated counties for septic soil. Within Mississippi alone it ranks 27 of 82.

Further reading

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