Little River County, AR's soil, for a septic absorption field
Very limited
87.8% of Little River County, AR's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 87.8% of the county. Little River County covers 531.255 square miles and counts 11,626 residents.
This is a county figure, not a parcel figure
Nothing about Little River County, AR's SSURGO figure applies to a specific address - it's a county-wide average. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Little River County.
System cost, conventional vs. engineered
Given Little River County's rating, plan for the engineered-system range rather than the conventional one. 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, Little River County, AR is the 1,485-most-constrained of 3,058 rated counties for septic soil. Within Arkansas alone it ranks 53 of 75.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems