What Valley County, NE's soil rates for a septic system
Very limited
63.2% of Valley County, NE's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. Practically, that rules out a simple gravity system for most of the county - 63.2% of it sits in USDA's most-constrained bucket. Valley County, NE is 568.09 square miles with a population of 4,032.
What Valley County's reading doesn't cover
Nothing about Valley County, NE's SSURGO figure applies to a specific address - it's a county-wide average. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Valley County will actually do.
What a system would cost here
With 63.2% of Valley 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.
Valley County's rank among Nebraska counties
Nationally, Valley County, NE is the 2,655-most-constrained of 3,058 rated counties for septic soil. Within Nebraska alone it ranks 76 of 93.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems