Grundy County, IA: the USDA septic-suitability picture

Very limited

Grundy County, IA's SSURGO dominant class comes back "Very limited", covering 99.8% of the county. That reading means a conventional system is a poor bet here - 99.8% of Grundy County lands in the strictest "very limited" bucket USDA uses. For scale: 501.855 square miles and 12,405 people call Grundy County home.

Before you rely on this for one lot

Grundy County's rating is an average across the whole county, not a promise about any one lot inside it. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).

Budgeting for a system in Grundy County, IA

Grundy County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. 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.

Grundy County's rank among Iowa counties

Among the 3,058 rated counties on this site, Grundy County, IA ranks 7 most-constrained nationally, and 1 of 99 within Iowa.

Further reading

How this rating is built, and its real limits · Conventional vs. engineered septic systems