What Crook County, WY's soil rates for a septic system
Very limited
In Crook County, WY, 77.8% of the surveyed land carries a "Very limited" rating for a standard septic drain 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. Crook County, WY is 2,854.48 square miles with a population of 7,775.
What Crook County's reading doesn't cover
Nothing about Crook County, WY's SSURGO figure applies to a specific address - it's a county-wide average. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Crook County will actually do.
What a system would cost here
With 77.8% of Crook 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.
Crook County's rank among Wyoming counties
Nationally, Crook County, WY is the 2,150-most-constrained of 3,058 rated counties for septic soil. Within Wyoming alone it ranks 5 of 22.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems