Septic soil in Roosevelt County, NM, by the numbers
Somewhat limited
61.5% of Roosevelt County, NM's surveyed soil comes back "Somewhat limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. It's a soil condition contractors work around routinely, with a bigger field or added fill, rather than one that forces an engineered system outright. Roosevelt County, NM is 2,446.051 square miles with a population of 18,713.
What Roosevelt County's reading doesn't cover
This is a countywide, area-weighted figure across every soil survey map unit in Roosevelt County, NM - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Roosevelt County will actually do.
What a system would cost here
With 61.5% of Roosevelt County rating "Somewhat limited", a standard gravity system is not a safe assumption here. 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.
Roosevelt County's rank among New Mexico counties
Nationally, Roosevelt County, NM is the 3,017-most-constrained of 3,058 rated counties for septic soil. Within New Mexico alone it ranks 29 of 29.
Related guides
How this rating is built, and its real limits · How a percolation test actually works