Warren County, TN: the USDA septic-suitability picture

Very limited

Warren County, TN's SSURGO dominant class comes back "Very limited", covering 64.6% of the county. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 64.6% of Warren County's land. The county spans 432.673 square miles, home to 43,619 people.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Warren 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.

Warren County: conventional vs. engineered cost

64.6% of Warren 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.

Where this sits nationally

Among the 3,058 rated counties on this site, Warren County, TN ranks 2,618 most-constrained nationally, and 85 of 95 within Tennessee.

Further reading

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