Imperial County, CA Environmental Rules: Flood Elevation Requirements (2026)
Key Facts
- Freeboard
- 2 feet above base flood elevation
- Applies to
- New construction & substantial improvement
- AO zones
- 2-4 ft above adjacent grade instead
- Certification
- Registered engineer or surveyor required
- Enforcement
- Misdemeanor for noncompliance
Summary
New and substantially improved homes in Imperial County's mapped flood zones must have their lowest floor elevated at least two feet above the base flood elevation: a two-foot freeboard above FEMA's minimum.
Residential construction, new or substantial improvement, shall have the lowest floor, including basement, ... c. In all other zones, elevated at least two feet above the base flood elevation.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 62 - 9-25).
Full Breakdown
Title 9, Division 16 sets construction standards for special flood hazard areas. Residential structures being newly built or substantially improved must have their lowest floor, including any basement, elevated at least two feet above the base flood elevation in an A zone or any other flood zone; AO zones use a different depth-based standard. A registered engineer or surveyor must certify the finished elevation, and the county Building Official verifies it before the floodplain administrator signs off.
Violations & Fines
Building below the required elevation without an approved variance is a misdemeanor and can void required elevation certification, affecting flood insurance eligibility.
Frequently Asked Questions
How high above base flood elevation must a home be built in Imperial County?
Who certifies the elevation of a new home in a flood zone?
Sources & Official References
Other rules in Imperial County
California rules heatmap·Compare Imperial County to another location·View the California environmental rules overview
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