Septic suitability in Madison County, GA
Somewhat limited
Madison County, GA's SSURGO dominant class comes back "Somewhat limited", covering 63.6% 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 282.324 square miles, home to 32,771 people.
What this number does and doesn't tell you
Two lots a mile apart in Madison 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.
Madison County: conventional vs. engineered cost
63.6% of Madison 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.
How Madison County, GA compares
Among the 3,058 rated counties on this site, Madison County, GA ranks 2,991 most-constrained nationally, and 127 of 159 within Georgia.
Further reading
How this rating is built, and its real limits · How a percolation test actually works