Madison County, TN Septic Rating

Septic suitability in Madison County, TN

Very limited

USDA puts Madison County, TN at "Very limited" for septic absorption fields, the dominant reading across 80.7% of the county's soil. That reading means a conventional system is a poor bet here - it's already USDA's strictest "very limited" bucket, not a partial constraint. For scale: 557 square miles and 100,409 people call Madison County home.

Before you rely on this for one lot

Madison 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 Madison County, TN

Madison 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 Madison County, TN compares

Among the 3,058 rated counties on this site, Madison County, TN ranks 2,001 most-constrained nationally, and 54 of 95 within Tennessee.

Further reading

How this rating is built, and its real limits · Conventional vs. engineered septic systems