Septic suitability in Union County, IA

Very limited

USDA puts Union County, IA at "Very limited" for septic absorption fields, the dominant reading across 98% of the county's soil. 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. For scale: 423.645 square miles and 11,955 people call Union County home.

Before you rely on this for one lot

USDA's survey covers the whole of Union County, IA at once, not any single address. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).

Budgeting for a system in Union County, IA

Union County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. 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.

Union County's rank among Iowa counties

Among the 3,058 rated counties on this site, Union County, IA ranks 254 most-constrained nationally, and 21 of 99 within Iowa.

Related guides

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