What Garland County, AR's soil rates for a septic system
Very limited
Soil across 87.1% of Garland 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. Garland County, AR is 677.615 square miles with a population of 99,902.
What Garland County's reading doesn't cover
USDA's survey covers the whole of Garland County, AR at once, not any single address. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Garland County will actually do.
What a system would cost here
With 87.1% of Garland 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.
Garland County's rank among Arkansas counties
Nationally, Garland County, AR is the 1,531-most-constrained of 3,058 rated counties for septic soil. Within Arkansas alone it ranks 57 of 75.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems