Atascosa County, TX: the USDA septic-suitability picture
Very limited
Atascosa County, TX's SSURGO dominant class comes back "Very limited", covering 96.3% of the county. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 96.3% of Atascosa County's land. For scale: 1,219.542 square miles and 52,783 people call Atascosa County home.
Before you rely on this for one lot
Atascosa County's rating is an average across the whole county, not a promise about any one lot inside it. 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 Atascosa County, TX
Atascosa 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.
Atascosa County's rank among Texas counties
Among the 3,058 rated counties on this site, Atascosa County, TX ranks 480 most-constrained nationally, and 27 of 253 within Texas.
Before you act on this
How this rating is built, and its real limits · Conventional vs. engineered septic systems