Park County, WY's soil, for a septic absorption field

Very limited

In Park County, WY, 80.4% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 80.4% of the county. Park County covers 6,939.039 square miles and counts 31,082 residents.

This is a county figure, not a parcel figure

This is a countywide, area-weighted figure across every soil survey map unit in Park County, WY - never a reading for one specific parcel. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Park County.

System cost, conventional vs. engineered

Given Park 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.

Where this sits nationally

Nationally, Park County, WY is the 2,022-most-constrained of 3,058 rated counties for septic soil. Within Wyoming alone it ranks 4 of 22.

Further reading

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