Septic soil in Webster Parish, LA, by the numbers

Very limited

Soil across 91.3% of Webster Parish, LA rates "Very limited" in USDA's septic-absorption-field interpretation. 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. Webster Parish, LA is 593.319 square miles with a population of 35,184.

What Webster Parish's reading doesn't cover

Webster 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 Webster Parish will actually do.

What a system would cost here

With 91.3% of Webster 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 Webster Parish, LA compares

Nationally, Webster Parish, LA is the 1,134-most-constrained of 3,058 rated counties for septic soil. Within Louisiana alone it ranks 16 of 61.

Further reading

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