Septic soil in Logan County, AR, by the numbers

Very limited

Soil across 92.7% of Logan County, AR rates "Very limited" in USDA's septic-absorption-field interpretation. Practically, that rules out a simple gravity system for most of the county - 92.7% of it sits in USDA's most-constrained bucket. Logan County covers 709.115 square miles and counts 21,457 residents.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Logan County, AR at once, not any single address. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Logan County.

System cost, conventional vs. engineered

Given Logan 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, Logan County, AR is the 962-most-constrained of 3,058 rated counties for septic soil. Within Arkansas alone it ranks 25 of 75.

Related guides

How this rating is built, and its real limits · Conventional vs. engineered septic systems