Septic soil in Red River Parish, LA, by the numbers

Very limited

In Red River Parish, LA, 72.9% 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 72.9% of the county. Red River Parish covers 388.98 square miles and counts 7,238 residents.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Red River 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 Red River Parish.

System cost, conventional vs. engineered

Given Red River 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.

Red River Parish's rank among Louisiana counties

Nationally, Red River Parish, LA is the 2,378-most-constrained of 3,058 rated counties for septic soil. Within Louisiana alone it ranks 53 of 61.

Before you act on this

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