Clinton County, MI Septic Rating
Clinton County's SSURGO septic rating
Very limited
Clinton County, MI's SSURGO dominant class comes back "Very limited", covering 97.2% of the county. That reading means a conventional system is a poor bet here - it's already USDA's strictest "very limited" bucket, not a partial constraint. The county spans 567 square miles, home to 80,050 people.
What this number does and doesn't tell you
Two lots a mile apart in Clinton 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.
Clinton County: conventional vs. engineered cost
97.2% of Clinton 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, Clinton County, MI ranks 348 most-constrained nationally, and 11 of 83 within Michigan.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems