Septic soil in Dallas County, AL, by the numbers

Very limited

83.3% of Dallas County, AL's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. That reading means a conventional system is a poor bet here - 83.3% of Dallas County lands in the strictest "very limited" bucket USDA uses. Dallas County, AL is 978.741 square miles with a population of 35,545.

What Dallas County's reading doesn't cover

Dallas County's rating is an average across the whole county, not a promise about any one lot inside it. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Dallas County will actually do.

What a system would cost here

With 83.3% of Dallas 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.

Dallas County's rank among Alabama counties

Nationally, Dallas County, AL is the 1,838-most-constrained of 3,058 rated counties for septic soil. Within Alabama alone it ranks 26 of 67.

Before you act on this

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