Septic soil in Ringgold County, IA, by the numbers

Very limited

Soil across 93.7% of Ringgold County, IA 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. Ringgold County, IA is 535.494 square miles with a population of 4,608.

What Ringgold County's reading doesn't cover

Two lots a mile apart in Ringgold County can carry different soil, even though they share one countywide rating. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Ringgold County will actually do.

What a system would cost here

With 93.7% of Ringgold 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.

How Ringgold County, IA compares

Nationally, Ringgold County, IA is the 842-most-constrained of 3,058 rated counties for septic soil. Within Iowa alone it ranks 59 of 99.

Before you act on this

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