Carson, CA Environmental Rules: Flood Elevation Requirements (2026)
Key Facts
- Residential floor elevation
- At or above base flood level
- Vent minimum
- 1 sq in per sq ft
- Zones covered
- A1-A30, AE, AH
- Governing section
- CMC § 8600.20(F)
Summary
In Carson's mapped flood zones, new and substantially improved residential buildings must have their lowest floor elevated to or above the base flood level.
Require that all new construction and substantial improvements of residential structures within Zones A1–A30, AE and AH on the City of Carson's FIRM have the lowest floor (including basement) elevated to or above the base flood level, unless the City is granted an exception by the Federal Insurance Administrator for the allowance of basements...
Full Breakdown
Carson Municipal Code § 8600.20(F) requires that, once FEMA has issued final base flood elevations, new construction and substantially improved residential structures within Zones A1-A30, AE and AH have the lowest floor, including any basement, elevated to or above the base flood level, unless the City obtains a FEMA exception allowing basements. Nonresidential structures may meet the same elevation standard or be floodproofed and watertight below the base flood level. Fully enclosed areas below the lowest floor used only for parking, access, or storage must have flood-vent openings totaling at least one square inch per square foot of enclosed area, with no opening more than one foot above grade.
Violations & Fines
Constructing or substantially improving a structure below the required base flood elevation, or without the required flood vents in enclosed lower areas, is enforced as a misdemeanor under CMC Chapter 6.
Frequently Asked Questions
Does Carson require freeboard above the FEMA base flood elevation?
What about enclosed space below an elevated house?
Sources & Official References
Other rules in Carson
California rules heatmap·Compare Carson to another location·View the California environmental rules overview
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Flood Elevation Requirements in Nearby Cities
How other cities in Los Angeles County handle flood elevation requirements.