Septic soil in Evangeline Parish, LA, by the numbers

Very limited

In Evangeline Parish, LA, 94.4% 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 94.4% of the county. Evangeline Parish covers 662.431 square miles and counts 31,745 residents.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Evangeline Parish, LA at once, not any single address. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Evangeline Parish.

System cost, conventional vs. engineered

Given Evangeline 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.

Evangeline Parish's rank among Louisiana counties

Nationally, Evangeline Parish, LA is the 724-most-constrained of 3,058 rated counties for septic soil. Within Louisiana alone it ranks 7 of 61.

Before you act on this

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