LaSalle Parish, LA's soil, for a septic absorption field

Very limited

Soil across 86.8% of LaSalle Parish, LA rates "Very limited" in USDA's septic-absorption-field interpretation. That reading means a conventional system is a poor bet here - 86.8% of LaSalle Parish lands in the strictest "very limited" bucket USDA uses. LaSalle Parish, LA is 624.854 square miles with a population of 14,702.

What LaSalle Parish's reading doesn't cover

Nothing about LaSalle Parish, LA's SSURGO figure applies to a specific address - it's a county-wide average. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in LaSalle Parish will actually do.

What a system would cost here

With 86.8% of LaSalle 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, LaSalle Parish, LA is the 1,561-most-constrained of 3,058 rated counties for septic soil. Within Louisiana alone it ranks 32 of 61.

Before you act on this

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