Maricopa, AZ Environmental Rules: Flood Elevation Requirements (2026)
Key Facts
- Freeboard above BFE
- 1 foot (regulatory flood elevation)
- Zone AO default
- 2 ft above highest adjacent grade
- Permit required
- Floodplain use permit
- Certification
- Registered engineer or surveyor
- Penalty
- Class 2 misdemeanor, per-day violation
Summary
New homes and substantial improvements in Maricopa's special flood hazard areas must set the lowest floor at least one foot above the base flood elevation: the city's defined "regulatory flood elevation." A floodplain use permit and engineer certification are required before and after construction.
“Regulatory flood elevation (RFE)” means an elevation one foot above the base flood elevation. ... Residential construction, new, or substantial improvement, shall have the lowest floor, including basement, elevated to or above the regulatory flood elevation.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 26-10, passed April 21, 2026).
Full Breakdown
Maricopa defines the regulatory flood elevation (RFE) as one foot above the base flood elevation (BFE): a one-foot freeboard. Under MCC 16.05.200(C)(1), new or substantially improved residential structures must have the lowest floor, including any basement, built to or above that RFE, using FIRM/FIS data for Zones AE and AH. In Zone AO, if no elevation is specified on the FIRM, the floor must sit at least two feet above the highest adjacent grade. A registered professional engineer or surveyor must certify the finished elevation to the floodplain administrator before the building is occupied.
Violations & Fines
Unauthorized development or diversion of flow in a delineated floodplain is a class 2 misdemeanor; a civil penalty up to the class 2 misdemeanor fine may also apply, with each day of continued violation a separate offense, and the city may report noncompliant structures to FEMA for denial of flood insurance.
Frequently Asked Questions
How high above the base flood elevation must a new Maricopa home be built?
Who verifies the elevation was met?
Sources & Official References
Other rules in Maricopa
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