White County, TN Septic Rating
White County, TN: the USDA septic-suitability picture
Very limited
White County, TN: USDA's soil survey calls 67.2% of the county "Very limited" for a septic leach field. This is the reading that pushes a project toward an engineered system rather than a conventional one, covering that same share of White County's land. The county spans 377 square miles, home to 29,108 people.
What this number does and doesn't tell you
Nothing about White County, TN'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.
White County: conventional vs. engineered cost
67.2% of White 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, White County, TN ranks 2,556 most-constrained nationally, and 83 of 95 within Tennessee.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems