St. Landry Parish, LA's soil, for a septic absorption field

Very limited

83.4% of St. Landry Parish, LA's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 83.4% of St. Landry Parish's land. St. Landry Parish, LA is 923.378 square miles with a population of 80,869.

What St. Landry Parish's reading doesn't cover

St. Landry Parish's rating is an average across the whole county, not a promise about any one lot inside it. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in St. Landry Parish will actually do.

What a system would cost here

With 83.4% of St. Landry 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 St. Landry Parish, LA compares

Nationally, St. Landry Parish, LA is the 1,827-most-constrained of 3,058 rated counties for septic soil. Within Louisiana alone it ranks 39 of 61.

Related guides

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