San Bernardino County, CA Environmental Rules: Flood Zones (2026)
FEMA flood zone rules in San Bernardino County, CA, also called floodplain regulations or special flood hazard area (SFHA) rules, determine flood insurance requirements and elevation standards for new construction.
Key Facts
- Overlay
- Floodplain Safety (FP) Overlay, Ch. 82.14
- 100-yr zone rule
- Elevation certificate + review required
- 500-yr zone rule
- First floor 1 ft above adjacent grade
- AE zone w/o floodway
- No net rise over 1 ft allowed
- Maps used
- FEMA FIRMs, current May 8, 2024 FIS
Summary
Unincorporated San Bernardino County regulates construction in FEMA flood hazard zones through an FP Overlay, requiring elevation certificates and minimum first-floor heights before permits issue.
The FP Overlay shall be subdivided into flood hazard zone areas... The following are the FEMA-designated flood hazard zones for this area: A, AE, AH, A1-30, and AO... New construction and substantial improvement of any structure shall be so constructed that the first floor (including basement) shall be one foot above the natural pre-development highest adjacent grade.
Full Breakdown
The County's Floodplain Safety (FP) Overlay applies to all FEMA-designated flood hazard zones (A, AE, AH, A1-30, AO, A-99, shaded Zone X). Property in the 100-year floodplain needs a Floodplain Development Standards Review and an elevation certificate from a licensed surveyor, engineer, or architect. In the 100-to-500-year floodplain, new construction and substantial improvements must have the first floor built at least one foot above the natural pre-development highest adjacent grade. Zone AE areas without a designated regulatory floodway face a development restriction unless hydrologic analysis shows no more than a one-foot rise in base flood elevation.
Violations & Fines
No structure or land use may be built, extended, converted, or altered in violation of this chapter; violations are subject to County Code penalties and the County can take lawful action to prevent or remedy them.
Frequently Asked Questions
Do I need an elevation certificate to build in a San Bernardino County flood zone?
How high must my first floor be in a 100-to-500-year flood zone?
Sources & Official References
Other rules in San Bernardino County
California rules heatmap·Compare San Bernardino County to another location·View the California environmental rules overview
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