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

Article 3 of the Yucaipa Development Code, the Floodplain Safety (FP) Overlay District, governs construction in flood-prone parts of the City of Yucaipa. Under § 85.020325, every new construction project and substantial improvement in a special flood hazard area must meet the NFIP minimums and the California Building Standards Code Appendix G and ASCE 24. Where the standards conflict, the more restrictive one applies.

For residential buildings, the lowest floor, basement included, goes up to the BFE plus the elevation required by Appendix G and ASCE 24, or to the Design Flood Elevation, whichever is higher. The definitions in § 85.020303 say the Design Flood Elevation is at least the Base Flood Elevation plus any required freeboard, so freeboard enters the Yucaipa standard through the DFE and the Building Code rather than as one fixed number for every zone.

Nonresidential buildings have a choice: elevate the lowest floor the same way, or dry-floodproof the structure to the required elevation. A registered professional engineer or architect must certify the floodproofing design. In AO Zones the lowest floor must be above the highest adjacent grade by the depth shown on the FIRM plus one foot, and not less than three feet above that grade when the FIRM shows no depth.

Enclosures below the lowest floor are limited to parking, building access, or storage. They need compliant flood openings, must use flood-damage-resistant materials, and cannot be finished or converted to habitable space. New or replacement manufactured homes must sit on permanent foundations, securely anchored, with the lowest floor meeting the same elevation rules. A recreational vehicle in a special flood hazard area must be on site for fewer than 180 consecutive days, be fully licensed and highway-ready, or be elevated and anchored like a manufactured home.

Paperwork runs through § 85.020320, which requires a floodplain development permit before any development in a special flood hazard area and Elevation Certificates for new construction and substantial improvements. The Floodplain Administrator is the City Engineer or designee. Substantial improvement means a cost equal to or exceeding 50 percent of the pre-improvement market value. The FIRMs for San Bernardino County and Incorporated Areas, effective October 30, 2025, are adopted by reference in § 85.020305.