Prairie County, AR: the USDA septic-suitability picture
Very limited
Prairie County, AR's SSURGO dominant class comes back "Very limited", covering 90.1% of the county. 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. The county spans 647.516 square miles, home to 7,935 people.
What this number does and doesn't tell you
Nothing about Prairie County, AR's SSURGO figure applies to a specific address - it's a county-wide average. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Prairie County: conventional vs. engineered cost
90.1% of Prairie County carrying a "Very limited" reading changes the realistic budget here. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.
Prairie County's rank among Arkansas counties
Among the 3,058 rated counties on this site, Prairie County, AR ranks 1,262 most-constrained nationally, and 38 of 75 within Arkansas.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems