Indio, CA Environmental Rules: Flood Elevation Requirements (2026)

All new construction or substantial improvements of residential structures shall have the lowest floor, including basement:

(a) In AE, AH, A1-30 Zones, elevated to or above the base flood elevation.

(b) In an AO Zone, elevated above the highest adjacent grade to a height equal to or exceeding the depth number specified in feet on the FIRM, or elevated at least two feet above the highest adjacent grade if no depth number is specified.

(c) In an A Zone, without BFE's specified on the FIRM [unnumbered A Zone], elevated to or above the base flood elevation; as determined under § 153.31(C).

(d) Upon the completion of the structure, the elevation of the lowest floor, including basement, shall be certified by a registered civil engineer or licensed land surveyor, and verified by the community Building Inspector to be properly elevated. Such certification and verification shall be provided to the Floodplain Administrator.

(2) Nonresidential construction. All new construction or substantial improvements of nonresidential structures shall either be elevated to conform with division (C)(1) of this section or:

(a) Be floodproofed, together with attendant utility and sanitary facilities, below the elevation recommended under division (C)(1) of this section, so that the structure is watertight with walls substantially impermeable to the passage of water;

(b)