Jackson County, CO: the USDA septic-suitability picture
Very limited
USDA puts Jackson County, CO at "Very limited" for septic absorption fields, the dominant reading across 92.6% of the county's soil. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 92.6% of Jackson County's land. The county spans 1,613.726 square miles, home to 1,273 people.
What this number does and doesn't tell you
Two lots a mile apart in Jackson County can carry different soil, even though they share one countywide rating. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Jackson County: conventional vs. engineered cost
92.6% of Jackson 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.
Where this sits nationally
Among the 3,058 rated counties on this site, Jackson County, CO ranks 976 most-constrained nationally, and 7 of 63 within Colorado.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems