What Walker County, TX's soil rates for a septic system
Very limited
98% of Walker 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. That reading means a conventional system is a poor bet here - 98% of Walker County lands in the strictest "very limited" bucket USDA uses. Walker County, TX is 784.228 square miles with a population of 83,722.
What Walker County's reading doesn't cover
Walker County's rating is an average across the whole county, not a promise about any one lot inside it. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Walker County will actually do.
What a system would cost here
With 98% of Walker 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.
Walker County's rank among Texas counties
Nationally, Walker County, TX is the 245-most-constrained of 3,058 rated counties for septic soil. Within Texas alone it ranks 16 of 253.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems