Septic suitability in Humphreys County, TN

Very limited

Humphreys County, TN's SSURGO dominant class comes back "Very limited", covering 92.9% of the county. Practically, that rules out a simple gravity system for most of the county - 92.9% of it sits in USDA's most-constrained bucket. For scale: 530.763 square miles and 19,554 people call Humphreys County home.

Before you rely on this for one lot

USDA's survey covers the whole of Humphreys County, TN at once, not any single address. 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 Humphreys County, TN

Humphreys 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.

Humphreys County's rank among Tennessee counties

Among the 3,058 rated counties on this site, Humphreys County, TN ranks 943 most-constrained nationally, and 14 of 95 within Tennessee.

Further reading

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