Hidalgo County, NM: the USDA septic-suitability picture

Very limited

Hidalgo County, NM's SSURGO dominant class comes back "Very limited", covering 82% of the county. Practically, that rules out a simple gravity system for most of the county - 82% of it sits in USDA's most-constrained bucket. The county spans 3,438.551 square miles, home to 3,966 people.

What this number does and doesn't tell you

USDA's survey covers the whole of Hidalgo County, NM at once, not any single address. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Hidalgo County: conventional vs. engineered cost

82% of Hidalgo County carrying a "Very limited" reading changes the realistic budget here. 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.

Where this sits nationally

Among the 3,058 rated counties on this site, Hidalgo County, NM ranks 1,931 most-constrained nationally, and 5 of 29 within New Mexico.

Before you act on this

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