Big Horn County, WY's soil, for a septic absorption field

Very limited

Soil across 74.6% of Big Horn County, WY 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 74.6% of the county. Big Horn County covers 3,136.957 square miles and counts 12,084 residents.

This is a county figure, not a parcel figure

Big Horn County's rating is an average across the whole county, not a promise about any one lot inside it. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Big Horn County.

System cost, conventional vs. engineered

Given Big Horn 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.

Big Horn County's rank among Wyoming counties

Nationally, Big Horn County, WY is the 2,305-most-constrained of 3,058 rated counties for septic soil. Within Wyoming alone it ranks 8 of 22.

Related guides

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