Simpson County, KY: the USDA septic-suitability picture

Somewhat limited

USDA puts Simpson County, KY at "Somewhat limited" for septic absorption fields, the dominant reading across 68.7% of the county's soil. Modification usually rescues a conventional system at this rating - added fill or a larger field - rather than forcing a full engineered redesign. The county spans 234.185 square miles, home to 20,350 people.

What this number does and doesn't tell you

Nothing about Simpson County, KY's SSURGO figure applies to a specific address - it's a county-wide average. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Simpson County: conventional vs. engineered cost

68.7% of Simpson County carrying a "Somewhat 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, Simpson County, KY ranks 3,000 most-constrained nationally, and 119 of 119 within Kentucky.

Further reading

How this rating is built, and its real limits · How a percolation test actually works