Caddo Parish, LA: the USDA septic-suitability picture

Very limited

Caddo Parish, LA: USDA's soil survey calls 74.4% of the county "Very limited" for a septic leach 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. The county spans 879.535 square miles, home to 224,893 people.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Caddo Parish, LA - never a reading for one specific parcel. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Caddo Parish: conventional vs. engineered cost

74.4% of Caddo Parish carrying a "Very limited" reading changes the realistic budget here. 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.

How Caddo Parish, LA compares

Among the 3,058 rated counties on this site, Caddo Parish, LA ranks 2,313 most-constrained nationally, and 52 of 61 within Louisiana.

Before you act on this

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