Septic suitability in Franklin Parish, LA
Very limited
USDA puts Franklin Parish, LA at "Very limited" for septic absorption fields, the dominant reading across 93.9% of the county's soil. That reading means a conventional system is a poor bet here - 93.9% of Franklin Parish lands in the strictest "very limited" bucket USDA uses. The county spans 624.298 square miles, home to 19,107 people.
What this number does and doesn't tell you
USDA's survey covers the whole of Franklin Parish, LA at once, not any single address. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Franklin Parish: conventional vs. engineered cost
93.9% of Franklin 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.
Franklin Parish's rank among Louisiana counties
Among the 3,058 rated counties on this site, Franklin Parish, LA ranks 803 most-constrained nationally, and 8 of 61 within Louisiana.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems