Mississippi County, AR's soil, for a septic absorption field
Very limited
Soil across 95% of Mississippi County, AR rates "Very limited" in USDA's septic-absorption-field interpretation. 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. Mississippi County, AR is 902.093 square miles with a population of 38,095.
What Mississippi County's reading doesn't cover
This is a countywide, area-weighted figure across every soil survey map unit in Mississippi County, AR - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Mississippi County will actually do.
What a system would cost here
With 95% of Mississippi 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.
How Mississippi County, AR compares
Nationally, Mississippi County, AR is the 668-most-constrained of 3,058 rated counties for septic soil. Within Arkansas alone it ranks 13 of 75.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems