Nash County's SSURGO septic rating
Somewhat limited
Nash County, NC's SSURGO dominant class comes back "Somewhat limited", covering 53.6% of the county. 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 540.444 square miles, home to 97,990 people.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Nash County, NC - never a reading for one specific parcel. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Nash County: conventional vs. engineered cost
53.6% of Nash 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.
Nash County's rank among North Carolina counties
Among the 3,058 rated counties on this site, Nash County, NC ranks 2,940 most-constrained nationally, and 88 of 97 within North Carolina.
Further reading
How this rating is built, and its real limits · How a percolation test actually works