What Dyer County, TN's soil rates for a septic system
Very limited
In Dyer County, TN, 88.6% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Practically, that rules out a simple gravity system for most of the county - 88.6% of it sits in USDA's most-constrained bucket. Dyer County, TN is 512.351 square miles with a population of 36,403.
What Dyer County's reading doesn't cover
USDA's survey covers the whole of Dyer County, TN at once, not any single address. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Dyer County will actually do.
What a system would cost here
With 88.6% of Dyer 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.
How Dyer County, TN compares
Nationally, Dyer County, TN is the 1,406-most-constrained of 3,058 rated counties for septic soil. Within Tennessee alone it ranks 26 of 95.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems