Carbon County, WY: the USDA septic-suitability picture

Very limited

USDA puts Carbon County, WY at "Very limited" for septic absorption fields, the dominant reading across 40.4% of the county's soil. Practically, that rules out a simple gravity system for most of the county - 40.4% of it sits in USDA's most-constrained bucket. The county spans 7,897.746 square miles, home to 14,250 people.

What this number does and doesn't tell you

Carbon County's rating is an average across the whole county, not a promise about any one lot inside it. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Carbon County: conventional vs. engineered cost

40.4% of Carbon County carrying a "Very limited" reading changes the realistic budget here. 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.

Carbon County's rank among Wyoming counties

Among the 3,058 rated counties on this site, Carbon County, WY ranks 2,912 most-constrained nationally, and 22 of 22 within Wyoming.

Further reading

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