Grant County, KS's soil, for a septic absorption field
Very limited
In Grant County, KS, 58.2% of the surveyed land carries a "Very limited" rating for a standard septic drain field. A standard gravity system routinely fails on ground like this; the same share of the county falls in USDA's worst absorption-field bucket outright. Grant County, KS is 574.808 square miles with a population of 7,097.
What Grant County's reading doesn't cover
Two lots a mile apart in Grant County can carry different soil, even though they share one countywide rating. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Grant County will actually do.
What a system would cost here
With 58.2% of Grant County rating "Very limited", a standard gravity system is not a safe assumption here. 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.
Grant County's rank among Kansas counties
Nationally, Grant County, KS is the 2,760-most-constrained of 3,058 rated counties for septic soil. Within Kansas alone it ranks 88 of 105.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems