What Pontotoc County, MS's soil rates for a septic system
Very limited
98.8% of Pontotoc County, MS'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 - 98.8% of Pontotoc County lands in the strictest "very limited" bucket USDA uses. Pontotoc County, MS is 497.813 square miles with a population of 32,014.
What Pontotoc County's reading doesn't cover
Two lots a mile apart in Pontotoc 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 Pontotoc County will actually do.
What a system would cost here
With 98.8% of Pontotoc 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, Pontotoc County, MS is the 117-most-constrained of 3,058 rated counties for septic soil. Within Mississippi alone it ranks 6 of 82.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems