What Montgomery County, AR's soil rates for a septic system

Very limited

Soil across 92.1% of Montgomery County, AR rates "Very limited" in USDA's septic-absorption-field interpretation. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 92.1% of the county. Montgomery County covers 780.453 square miles and counts 8,510 residents.

This is a county figure, not a parcel figure

This is a countywide, area-weighted figure across every soil survey map unit in Montgomery County, AR - never a reading for one specific parcel. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Montgomery County.

System cost, conventional vs. engineered

Given Montgomery 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.

Montgomery County's rank among Arkansas counties

Nationally, Montgomery County, AR is the 1,032-most-constrained of 3,058 rated counties for septic soil. Within Arkansas alone it ranks 28 of 75.

Further reading

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