Ellis County's SSURGO septic rating

Very limited

USDA puts Ellis County, OK at "Very limited" for septic absorption fields, the dominant reading across 64.8% of the county's soil. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 64.8% of the county. For scale: 1,231.477 square miles and 3,601 people call Ellis County home.

Before you rely on this for one lot

This is a countywide, area-weighted figure across every soil survey map unit in Ellis County, OK - never a reading for one specific parcel. 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 Ellis County, OK

Ellis 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.

Ellis County's rank among Oklahoma counties

Among the 3,058 rated counties on this site, Ellis County, OK ranks 2,613 most-constrained nationally, and 68 of 77 within Oklahoma.

Further reading

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