Septic suitability in Izard County, AR
Very limited
Izard County, AR's SSURGO dominant class comes back "Very limited", covering 67.2% of the county. Practically, that rules out a simple gravity system for most of the county - 67.2% of it sits in USDA's most-constrained bucket. The county spans 580.201 square miles, home to 14,291 people.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Izard County, AR - never a reading for one specific parcel. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Izard County: conventional vs. engineered cost
67.2% of Izard 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.
Where this sits nationally
Among the 3,058 rated counties on this site, Izard County, AR ranks 2,557 most-constrained nationally, and 75 of 75 within Arkansas.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems