Panola County, TX: the USDA septic-suitability picture
Very limited
Panola County, TX's SSURGO dominant class comes back "Very limited", covering 93.2% of the county. A standard gravity system routinely fails on ground like this; the same share of the county falls in USDA's worst absorption-field bucket outright. For scale: 811.355 square miles and 23,022 people call Panola County home.
Before you rely on this for one lot
This is a countywide, area-weighted figure across every soil survey map unit in Panola County, TX - never a reading for one specific parcel. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).
Budgeting for a system in Panola County, TX
Panola County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.
How Panola County, TX compares
Among the 3,058 rated counties on this site, Panola County, TX ranks 903 most-constrained nationally, and 60 of 253 within Texas.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems