Sedgwick County's SSURGO septic rating
Very limited
Sedgwick County, KS's SSURGO dominant class comes back "Very limited", covering 82.9% of the county. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 82.9% of Sedgwick County's land. The county spans 997.001 square miles, home to 536,081 people.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Sedgwick County, KS - never a reading for one specific parcel. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Sedgwick County: conventional vs. engineered cost
82.9% of Sedgwick 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, Sedgwick County, KS ranks 1,863 most-constrained nationally, and 54 of 105 within Kansas.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems