Decatur County, TN's soil, for a septic absorption field

Very limited

In Decatur County, TN, 89.6% of the surveyed land carries a "Very limited" rating for a standard septic drain field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 89.6% of Decatur County's land. Decatur County, TN is 333.879 square miles with a population of 11,800.

What Decatur County's reading doesn't cover

This is a countywide, area-weighted figure across every soil survey map unit in Decatur County, TN - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Decatur County will actually do.

What a system would cost here

With 89.6% of Decatur County rating "Very limited", a standard gravity system is not a safe assumption here. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.

Decatur County's rank among Tennessee counties

Nationally, Decatur County, TN is the 1,316-most-constrained of 3,058 rated counties for septic soil. Within Tennessee alone it ranks 22 of 95.

Further reading

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