Lafayette Parish, LA Septic Rating

Septic suitability in Lafayette Parish, LA

Very limited

USDA puts Lafayette Parish, LA at "Very limited" for septic absorption fields, the dominant reading across 79.9% of the county's soil. This is the reading that pushes a project toward an engineered system rather than a conventional one, covering that same share of Lafayette Parish's land. For scale: 269 square miles and 254,241 people call Lafayette Parish home.

Before you rely on this for one lot

Two lots a mile apart in Lafayette Parish can carry different soil, even though they share one countywide rating. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).

Budgeting for a system in Lafayette Parish, LA

Lafayette Parish's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.

Lafayette Parish's rank among Louisiana counties

Among the 3,058 rated counties on this site, Lafayette Parish, LA ranks 2,048 most-constrained nationally, and 47 of 61 within Louisiana.

Before you act on this

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