Why this exists

Anyone shopping rural land, or planning a build where there's no sewer connection, eventually needs to know whether the ground will support a septic system - usually only after paying for a perc test to find out the hard way. PercCheck reports what USDA already knows: the dominant soil condition for a standard septic absorption field, for every county, before that test gets booked.

What goes into the number

Every figure traces to USDA's Soil Survey Geographic (SSURGO) database, specifically its "ENG - Septic Tank Absorption Fields" interpretation, area-weighted across every map unit in a county's survey area. Nothing here is re-normalized or estimated - the data-quality guide documents exactly how the dominant class is chosen and which counties have no interpretation to report.

Written by

The county pages on PercCheck are written with AI tools working from USDA's Soil Data Access tables, not reported by a named journalist. Each page's figures are cross-referenced against USDA's published tables before publication, and the site is maintained by its publisher.

Who runs this

PercCheck is an independently run site. It is not affiliated with the USDA, any state or county health department, or any septic contractor. Where a page includes a sponsored or affiliate link, that is disclosed on the page itself and in the privacy policy.

Corrections

If a county's numbers look wrong, report it through the contact page - corrections are checked against USDA's source tables directly, not against another site's copy of them.