Septic soil in Stephens County, TX, by the numbers
Very limited
95.3% of Stephens 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 95.3% of the county. Stephens County, TX is 896.721 square miles with a population of 9,475.
What Stephens County's reading doesn't cover
Two lots a mile apart in Stephens 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 Stephens County will actually do.
What a system would cost here
With 95.3% of Stephens 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.
How Stephens County, TX compares
Nationally, Stephens County, TX is the 643-most-constrained of 3,058 rated counties for septic soil. Within Texas alone it ranks 42 of 253.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems