What Tensas Parish, LA's soil rates for a septic system

Very limited

Soil across 92.1% of Tensas Parish, LA rates "Very limited" in USDA's septic-absorption-field interpretation. Practically, that rules out a simple gravity system for most of the county - 92.1% of it sits in USDA's most-constrained bucket. Tensas Parish, LA is 603.302 square miles with a population of 3,844.

What Tensas Parish's reading doesn't cover

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

What a system would cost here

With 92.1% of Tensas 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, Tensas Parish, LA is the 1,034-most-constrained of 3,058 rated counties for septic soil. Within Louisiana alone it ranks 12 of 61.

Before you act on this

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