Cooke County, TX: the USDA septic-suitability picture
Very limited
Cooke County, TX's SSURGO dominant class comes back "Very limited", covering 80.6% of the county. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 80.6% of Cooke County's land. The county spans 874.826 square miles, home to 44,258 people.
What this number does and doesn't tell you
Nothing about Cooke County, TX's SSURGO figure applies to a specific address - it's a county-wide average. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Cooke County: conventional vs. engineered cost
80.6% of Cooke County carrying a "Very limited" reading changes the realistic budget here. 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.
Where this sits nationally
Among the 3,058 rated counties on this site, Cooke County, TX ranks 2,011 most-constrained nationally, and 150 of 253 within Texas.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems