Madison County, TX Septic Rating
Madison County, TX: the USDA septic-suitability picture
Very limited
Madison County, TX's SSURGO dominant class comes back "Very limited", covering 95.6% of the county. That reading means a conventional system is a poor bet here - it's already USDA's strictest "very limited" bucket, not a partial constraint. The county spans 466 square miles, home to 13,877 people.
What this number does and doesn't tell you
Nothing about Madison 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.
Madison County: conventional vs. engineered cost
95.6% of Madison 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.
Madison County's rank among Texas counties
Among the 3,058 rated counties on this site, Madison County, TX ranks 584 most-constrained nationally, and 37 of 253 within Texas.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems