Coke County, TX's soil, for a septic absorption field
Very limited
In Coke County, TX, 81.7% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Practically, that rules out a simple gravity system for most of the county - 81.7% of it sits in USDA's most-constrained bucket. Coke County, TX is 911.647 square miles with a population of 3,396.
What Coke County's reading doesn't cover
USDA's survey covers the whole of Coke County, TX at once, not any single address. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Coke County will actually do.
What a system would cost here
With 81.7% of Coke 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.
Coke County's rank among Texas counties
Nationally, Coke County, TX is the 1,955-most-constrained of 3,058 rated counties for septic soil. Within Texas alone it ranks 143 of 253.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems