Costilla County's SSURGO septic rating

Very limited

Costilla County, CO: USDA's soil survey calls 65.2% of the county "Very limited" for a septic leach field. That reading means a conventional system is a poor bet here - 65.2% of Costilla County lands in the strictest "very limited" bucket USDA uses. The county spans 1,227.593 square miles, home to 3,686 people.

What this number does and doesn't tell you

Nothing about Costilla County, CO's SSURGO figure applies to a specific address - it's a county-wide average. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Costilla County: conventional vs. engineered cost

65.2% of Costilla 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.

Costilla County's rank among Colorado counties

Among the 3,058 rated counties on this site, Costilla County, CO ranks 2,605 most-constrained nationally, and 45 of 63 within Colorado.

Related guides

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