What Washington County, MS's soil rates for a septic system

Very limited

In Washington County, MS, 92.6% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 92.6% of the county. Washington County, MS is 724.147 square miles with a population of 41,181.

What Washington County's reading doesn't cover

Nothing about Washington County, MS's SSURGO figure applies to a specific address - it's a county-wide average. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Washington County will actually do.

What a system would cost here

With 92.6% of Washington 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.

Washington County's rank among Mississippi counties

Nationally, Washington County, MS is the 972-most-constrained of 3,058 rated counties for septic soil. Within Mississippi alone it ranks 37 of 82.

Before you act on this

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