Otero County, NM Environmental Rules: Flood Elevation Requirements (2026)

Otero County Code § 135-18A requires new construction and substantial improvement of any residential structure in an area of special flood hazard to have its lowest floor, including any basement, elevated to or above the base flood elevation (BFE) shown on FEMA's Flood Insurance Rate Map. Where no detailed BFE is available in an AO Zone, the lowest floor must instead be elevated at least 24 inches above the highest adjacent grade, a freeboard-style backstop that applies specifically when precise elevation data is missing. A registered professional engineer, architect or land surveyor must submit a certificate of elevation to the floodplain administrator confirming the standard is met, as required in the § 135-15A permit application.

Nonresidential structures under § 135-18B get an alternative: elevate to the BFE or dry-floodproof the structure to be watertight below that level, with an engineer or architect certifying the design. Section 135-18C requires enclosed areas below the lowest floor used only for parking, access or storage to have at least two openings on separate walls, totaling one square inch of net area per square foot of enclosed area, with the opening bottoms no higher than one foot above grade, so floodwaters can enter and exit without collapsing the structure.

Manufactured homes placed in Zones A1-30, AH, AO or AE must have the bottom of the lowest horizontal chassis member elevated to or above the BFE and anchored against flotation and lateral movement under § 135-18D.