Jefferson Parish, LA's soil, for a septic absorption field

Very limited

In Jefferson Parish, LA, 69.8% 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 69.8% of the county. Jefferson Parish, LA is 300.864 square miles with a population of 427,253.

What Jefferson Parish's reading doesn't cover

USDA's survey covers the whole of Jefferson Parish, LA 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 Jefferson Parish will actually do.

What a system would cost here

With 69.8% of Jefferson Parish 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.

Jefferson Parish's rank among Louisiana counties

Nationally, Jefferson Parish, LA is the 2,467-most-constrained of 3,058 rated counties for septic soil. Within Louisiana alone it ranks 57 of 61.

Related guides

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