Young County, TX's soil, for a septic absorption field
Very limited
97% of Young County, TX's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 97% of the county. Young County, TX is 914.498 square miles with a population of 18,236.
What Young County's reading doesn't cover
Two lots a mile apart in Young 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 Young County will actually do.
What a system would cost here
With 97% of Young 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.
Where this sits nationally
Nationally, Young County, TX is the 383-most-constrained of 3,058 rated counties for septic soil. Within Texas alone it ranks 23 of 253.
Before you act on this
How this rating is built, and its real limits · Conventional vs. engineered septic systems