How suitable is the soil for a septic system?

The USDA soil survey (SSURGO) map unit under each ZIP's population-weighted center, fetched from Soil Data Access: its dominant soil, drainage class, whether it is hydric (wet enough to have formed under water), farmland class, flooding and ponding frequency, and two engineering ratings that decide what a rural lot can do: Ohio's own rating for septic leach fields and the national rating for houses with basements. A single point stands for the whole ZIP, so treat it as the typical soil, not the soil under any one lot; Ohio's clay till plains rate "very limited" for septic almost everywhere, which is why county health departments require engineered systems. The card ends with the elevation of the ZIP's population center from the Copernicus global elevation model.

1,228 of 1,233 ZIPs have data; median 1.

Legend

Map of Ohio by Soils

Source

USDA NRCS SSURGO via Soil Data Access: the soil map unit under each ZIP's population-weighted center with its dominant component, drainage, hydric and farmland class, flooding, and the Ohio septic and basement interpretation ratings; Copernicus GLO-90 elevation model via Open-Meteo at the ZIP center

USDA Soil Data Access · Web Soil Survey · Open-Meteo elevation

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