Septic suitability in Clay County, IA

Very limited

Clay County, IA: USDA's soil survey calls 94.5% of the county "Very limited" for a septic leach field. 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: 567.238 square miles and 16,474 people call Clay County home.

Before you rely on this for one lot

USDA's survey covers the whole of Clay 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 Clay County, IA

Clay 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.

Where this sits nationally

Among the 3,058 rated counties on this site, Clay County, IA ranks 714 most-constrained nationally, and 49 of 99 within Iowa.

Related guides

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