Oxnard, CA Environmental Rules: Flood Zones (2026)
FEMA flood zone rules in Oxnard, CA, also called floodplain regulations or special flood hazard area (SFHA) rules, determine flood insurance requirements and elevation standards for new construction.
Key Facts
- Governing chapter
- Oxnard Code Ch. 18, Floodplain Management
- Permit required
- Development permit before construction begins
- Minimum floor elevation
- 2 feet above base flood elevation (Zone A)
- Fill compaction standard
- 95% under Standard Proctor Test
- Violation classification
- Misdemeanor (Sec. 18-10)
- Appeal body
- Oxnard City Council
- Flood study basis
- FEMA Flood Insurance Study, effective March 1, 1979
Summary
Oxnard requires a development permit before any construction, fill, or land alteration in a mapped area of special flood hazard. Building without one, or violating the chapter's construction standards, is a misdemeanor under City Code Chapter 18.
No structure or land shall hereafter be constructed, located, extended, converted, or altered without full compliance with the terms of this chapter and other applicable regulations. Violations of the provisions of this chapter by failure to comply with any of its requirements (including violations of conditions and safeguards established in connection with conditions) shall constitute a misdemeanor. Nothing herein shall prevent the city from taking such lawful action as is necessary to prevent or remedy any violation.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Contains Supplement current through 1-26-2026).
Full Breakdown
Chapter 18 of the Oxnard Code of Ordinances adopts the FEMA Flood Insurance Study for the City of Oxnard (dated March 1, 1979) and its accompanying Flood Insurance Rate Maps, along with all later revisions, as the official basis for identifying areas of special flood hazard citywide (Sec. 18-9). The study is kept on file at City Hall, 305 West Third Street. Anyone proposing to construct, locate, extend, convert or alter a structure, or to fill, grade, dredge or otherwise develop land within one of these mapped zones, must first obtain a development permit from the floodplain administrator (Sec.
18-25). The application must include a site plan with spot ground elevations at building corners and at 20-foot or smaller intervals along the foundation footprint (or one-foot contours across the site), the location of proposed water, sewer and utility lines, the base flood elevation where available, and foundation design detail. Fill placed under a foundation must be compacted to 95% under the Standard Proctor Test method. Sec. 18-35 sets the construction standards that apply inside these zones: new construction and substantial improvements must be anchored against flotation and lateral movement, built with flood-resistant materials per FEMA Technical Bulletin TB 2-93, and have mechanical and electrical equipment located or designed to keep water out during flooding.
The lowest floor of new residential construction, including any basement, must sit at least two feet above the base flood elevation in Zone A and in all other zones; Zone AO structures must be raised to the depth number shown on the FIRM (or at least two feet if none is specified) or four feet if there is no velocity component. Once built, a registered engineer or surveyor must certify the finished elevation, and a city building inspector must verify it before the certification is filed with the floodplain administrator.
Nonresidential buildings may instead be flood-proofed to be watertight below that same elevation, certified by a registered engineer or architect. Appeals from the floodplain administrator's decisions go to the city council, sitting as the appeal board (Sec. 18-26).
Violations & Fines
Building, converting, or altering a structure in a special flood hazard area without a development permit, or without meeting Chapter 18's construction and elevation standards, is a misdemeanor under Sec. 18-10. The city may also take any other lawful action needed to prevent or remedy a violation, independent of criminal prosecution, and the more restrictive of Chapter 18 or any conflicting easement, covenant, or deed restriction controls under Sec. 18-11.
Frequently Asked Questions
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Sources & Official References
Other rules in Oxnard
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Flood Zones in Nearby Cities
How other cities in Ventura County handle flood zones.