What Oxford County, ME's soil rates for a septic system
Very limited
Soil across 90.3% of Oxford County, ME rates "Very limited" in USDA's septic-absorption-field interpretation. A standard gravity system routinely fails on ground like this; the same share of the county falls in USDA's worst absorption-field bucket outright. Oxford County covers 2,076.958 square miles and counts 60,039 residents.
This is a county figure, not a parcel figure
USDA's survey covers the whole of Oxford County, ME at once, not any single address. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Oxford County.
System cost, conventional vs. engineered
Given Oxford County's rating, plan for the engineered-system range rather than the conventional one. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.
Where this sits nationally
Nationally, Oxford County, ME is the 1,231-most-constrained of 3,058 rated counties for septic soil. Within Maine alone it ranks 5 of 16.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems