Septic suitability in Shawnee County, KS
Very limited
Shawnee County, KS's SSURGO dominant class comes back "Very limited", covering 91.4% of the county. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 91.4% of Shawnee County's land. The county spans 544.012 square miles, home to 177,942 people.
What this number does and doesn't tell you
Shawnee 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.
Shawnee County: conventional vs. engineered cost
91.4% of Shawnee 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.
Shawnee County's rank among Kansas counties
Among the 3,058 rated counties on this site, Shawnee County, KS ranks 1,113 most-constrained nationally, and 46 of 105 within Kansas.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems