What Sheridan County, WY's soil rates for a septic system
Very limited
75% of Sheridan County, WY's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 75% of Sheridan County's land. Sheridan County, WY is 2,523.361 square miles with a population of 32,978.
What Sheridan County's reading doesn't cover
Two lots a mile apart in Sheridan County can carry different soil, even though they share one countywide rating. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Sheridan County will actually do.
What a system would cost here
With 75% of Sheridan 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.
How Sheridan County, WY compares
Nationally, Sheridan County, WY is the 2,279-most-constrained of 3,058 rated counties for septic soil. Within Wyoming alone it ranks 7 of 22.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems