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Imperial County, CA Environmental Rules: Flood Zones (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

FEMA flood zone rules in Imperial 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

Permit required: Before any flood-hazard-area construction
Flood maps: 1983 FEMA study, 1984 FIRM
Salton Sea rule: Land at/below 220-ft elevation included
Administrator: County Building Official
Violation: Misdemeanor

FEMA Flood Zone Lookup

FEMA assigns every parcel in the U.S. a flood-hazard designation on its Flood Insurance Rate Maps (FIRMs). Zones starting with A or V are high-risk Special Flood Hazard Areas where federally backed mortgages require NFIP flood insurance. Zone X indicates moderate-to-minimal risk, where insurance is optional but often recommended. Your specific zone determines insurance cost, build elevation, and permit requirements in Imperial County, CA.

Zone	What it means	NFIP required?
A	High-risk flood area; 1% annual chance flood, no detailed analysis.	Yes
AE	High-risk; same as A but with established Base Flood Elevations.	Yes
AH	High-risk shallow flooding (1-3 ft), usually ponding.	Yes
AO	High-risk shallow flooding (1-3 ft) with sheet flow on sloping terrain.	Yes
V	High-risk coastal zone subject to wave action (no BFE).	Yes
VE	High-risk coastal zone with wave action and established BFEs.	Yes
X (shaded)	Moderate risk; between the 1% and 0.2% annual chance flood.	Recommended
X	Minimal risk; outside the 0.2% annual chance floodplain.	No

Look up Imperial County, CA on the FEMA flood map

FEMA maps update periodically; verify zone before buying flood insurance or building.

Summary

Imperial County requires a development permit before any construction in a FEMA-mapped special flood hazard area, including land around the Salton Sea at or below 220 feet elevation.

These county ordinances apply to unincorporated areas of Imperial County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

A development permit shall be obtained before construction or development begins within any area of special flood hazards or areas of mudslide (i.e., mudflow) established in Section 91603.01. Application for a development permit shall be made on forms furnished by the floodplain administrator and may include, but not be limited to, plans in duplicate drawn to scale showing the nature, location, dimensions, and elevations of the area in question; existing or proposed structures, fill, storage of materials, drainage facilities; and the location of the foregoing. Specifically, the following information is required:

View official code

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

The county's Flood Damage Prevention division (Title 9, Division 16) applies to all FEMA-designated special flood hazard and mudslide areas identified in the 1983 Flood Insurance Study and its FIRM, plus any land around the Salton Sea at or below the 220-foot elevation contour. No structure or land may be built, altered, or extended within these areas without a development permit from the floodplain administrator (the county Building Official), who reviews site plans, elevations, and drainage before approving work.

Violations & Fines

Building without a permit in a special flood hazard area is a misdemeanor; the floodplain administrator can also suspend or revoke a permit issued on inaccurate information.

Frequently Asked Questions

Do I need a permit to build near the Salton Sea in Imperial County?

Yes: the county treats any land around the Salton Sea at or below the 220-foot elevation contour as a special flood hazard area requiring a development permit before construction.

Who administers Imperial County's floodplain rules?

The county Building Official, acting as floodplain administrator, reviews and issues development permits for construction in special flood hazard areas.

Sources & Official References

[1]Imperial County Code of Ordinances (Municode)

Other rules in Imperial County

Noise Ordinances: Quiet HoursSome Restrictions Flood Elevation RequirementsSome Restrictions Stormwater ManagementSome Restrictions Erosion ControlSome Restrictions Noise Ordinances: Decibel LimitsSome Restrictions Noise Ordinances: Barking DogsSome Restrictions Noise Ordinances: Amplified Music & Outdoor SoundSome Restrictions Parking Rules: Abandoned VehiclesSome Restrictions Parking Rules: Commercial & Oversized VehiclesSignificant Restrictions

All Imperial County rules

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