Union County, OH's soil, for a septic absorption field
Very limited
In Union County, OH, 98.6% of the surveyed land carries a "Very limited" rating for a standard septic drain field. That reading means a conventional system is a poor bet here - 98.6% of Union County lands in the strictest "very limited" bucket USDA uses. Union County, OH is 431.713 square miles with a population of 71,721.
What Union County's reading doesn't cover
Nothing about Union County, OH'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 Union County will actually do.
What a system would cost here
With 98.6% of Union 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.
Union County's rank among Ohio counties
Nationally, Union County, OH is the 146-most-constrained of 3,058 rated counties for septic soil. Within Ohio alone it ranks 16 of 87.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems