Humphreys County's SSURGO septic rating
Very limited
USDA puts Humphreys County, MS at "Very limited" for septic absorption fields, the dominant reading across 95.2% of the county's soil. That reading means a conventional system is a poor bet here - 95.2% of Humphreys County lands in the strictest "very limited" bucket USDA uses. The county spans 418.635 square miles, home to 7,121 people.
What this number does and doesn't tell you
Two lots a mile apart in Humphreys County can carry different soil, even though they share one countywide rating. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Humphreys County: conventional vs. engineered cost
95.2% of Humphreys County 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.
Where this sits nationally
Among the 3,058 rated counties on this site, Humphreys County, MS ranks 656 most-constrained nationally, and 25 of 82 within Mississippi.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems