Septic soil in Bienville Parish, LA, by the numbers

Very limited

In Bienville Parish, LA, 85% of the surveyed land carries a "Very limited" rating for a standard septic drain field. That reading means a conventional system is a poor bet here - 85% of Bienville Parish lands in the strictest "very limited" bucket USDA uses. Bienville Parish, LA is 811.327 square miles with a population of 12,412.

What Bienville Parish's reading doesn't cover

USDA's survey covers the whole of Bienville 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 Bienville Parish will actually do.

What a system would cost here

With 85% of Bienville 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.

Where this sits nationally

Nationally, Bienville Parish, LA is the 1,691-most-constrained of 3,058 rated counties for septic soil. Within Louisiana alone it ranks 35 of 61.

Related guides

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