Smith County's SSURGO septic rating

Very limited

Smith County, TN's SSURGO dominant class comes back "Very limited", covering 85.8% of the county. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 85.8% of Smith County's land. For scale: 314.278 square miles and 20,783 people call Smith County home.

Before you rely on this for one lot

Nothing about Smith County, TN's SSURGO figure applies to a specific address - it's a county-wide average. 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 Smith County, TN

Smith 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 Smith County, TN compares

Among the 3,058 rated counties on this site, Smith County, TN ranks 1,635 most-constrained nationally, and 33 of 95 within Tennessee.

Further reading

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