What Rapides Parish, LA's soil rates for a septic system

Very limited

78.9% of Rapides 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. Practically, that rules out a simple gravity system for most of the county - 78.9% of it sits in USDA's most-constrained bucket. Rapides Parish, LA is 1,324.08 square miles with a population of 125,899.

What Rapides Parish's reading doesn't cover

USDA's survey covers the whole of Rapides Parish, LA at once, not any single address. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Rapides Parish will actually do.

What a system would cost here

With 78.9% of Rapides 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 Rapides Parish, LA compares

Nationally, Rapides Parish, LA is the 2,094-most-constrained of 3,058 rated counties for septic soil. Within Louisiana alone it ranks 49 of 61.

Further reading

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