Franklin County, MS: the USDA septic-suitability picture

Very limited

Franklin County, MS's SSURGO dominant class comes back "Very limited", covering 97.6% of the county. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 97.6% of the county. For scale: 563.964 square miles and 7,516 people call Franklin County home.

Before you rely on this for one lot

Two lots a mile apart in Franklin County can carry different soil, even though they share one countywide rating. 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 Franklin County, MS

Franklin 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.

Franklin County's rank among Mississippi counties

Among the 3,058 rated counties on this site, Franklin County, MS ranks 311 most-constrained nationally, and 16 of 82 within Mississippi.

Further reading

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