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

Very limited

98.2% of Jefferson Davis Parish, LA's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 98.2% of the county. Jefferson Davis Parish covers 651.52 square miles and counts 31,436 residents.

This is a county figure, not a parcel figure

Jefferson Davis Parish's rating is an average across the whole county, not a promise about any one lot inside it. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Jefferson Davis Parish.

System cost, conventional vs. engineered

Given Jefferson Davis Parish's rating, plan for the engineered-system range rather than the conventional one. 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 Davis Parish's rank among Louisiana counties

Nationally, Jefferson Davis Parish, LA is the 216-most-constrained of 3,058 rated counties for septic soil. Within Louisiana alone it ranks 3 of 61.

Related guides

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