What Winn Parish, LA's soil rates for a septic system
Very limited
In Winn Parish, LA, 97% 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 - 97% of Winn Parish lands in the strictest "very limited" bucket USDA uses. Winn Parish, LA is 950.004 square miles with a population of 13,405.
What Winn Parish's reading doesn't cover
This is a countywide, area-weighted figure across every soil survey map unit in Winn Parish, LA - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Winn Parish will actually do.
What a system would cost here
With 97% of Winn 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, Winn Parish, LA is the 388-most-constrained of 3,058 rated counties for septic soil. Within Louisiana alone it ranks 5 of 61.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems