Septic soil in Caldwell Parish, LA, by the numbers

Very limited

In Caldwell Parish, LA, 91.4% of the surveyed land carries a "Very limited" rating for a standard septic drain field. A standard gravity system routinely fails on ground like this; the same share of the county falls in USDA's worst absorption-field bucket outright. Caldwell Parish, LA is 529.77 square miles with a population of 9,393.

What Caldwell Parish's reading doesn't cover

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

What a system would cost here

With 91.4% of Caldwell 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.

How Caldwell Parish, LA compares

Nationally, Caldwell Parish, LA is the 1,127-most-constrained of 3,058 rated counties for septic soil. Within Louisiana alone it ranks 15 of 61.

Before you act on this

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