Obion County, TN Septic Rating
Obion County, TN: the USDA septic-suitability picture
Very limited
USDA puts Obion County, TN at "Very limited" for septic absorption fields, the dominant reading across 83.4% 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. The county spans 545 square miles, home to 30,261 people.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Obion County, TN - never a reading for one specific parcel. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Obion County: conventional vs. engineered cost
83.4% of Obion 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.
How Obion County, TN compares
Among the 3,058 rated counties on this site, Obion County, TN ranks 1,831 most-constrained nationally, and 42 of 95 within Tennessee.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems