Iron County's SSURGO septic rating

Very limited

Iron County, UT: USDA's soil survey calls 64.4% of the county "Very limited" for a septic leach field. Practically, that rules out a simple gravity system for most of the county - 64.4% of it sits in USDA's most-constrained bucket. For scale: 3,296.167 square miles and 65,936 people call Iron County home.

Before you rely on this for one lot

Iron County's rating is an average across the whole county, not a promise about any one lot inside it. 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 Iron County, UT

Iron 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, Iron County, UT ranks 2,629 most-constrained nationally, and 23 of 28 within Utah.

Related guides

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