Mesa, AZ Environmental Rules: Flood Zones (2026)
FEMA flood zone rules in Mesa, AZ, also called floodplain regulations or special flood hazard area (SFHA) rules, determine flood insurance requirements and elevation standards for new construction.
Key Facts
- Floodplain administrator
- City Engineer
- Regulations applied
- Maricopa County Floodplain Management Regs
- Pre-occupancy requirement
- Approved Elevation Certificate
- Criminal penalty
- Class 2 Misdemeanor
- Rate maps adopted
- September 18, 2020 FIRM/Flood Study
Summary
Mesa has left floodplain management authority with the Flood Control District of Maricopa County rather than administering its own program, so development in any city Flood Hazard Zone must follow the County's Floodplain Management Regulations. The City Engineer, as Floodplain Administrator, still requires an approved elevation certificate before occupancy and enforces violations as a Class 2 misdemeanor.
In accordance with A.R.S. Title 48, Chapter 21, Article 1, the City of Mesa elects not to assume the responsibility of Floodplain Management from the Flood Control District of Maricopa County as provided for in A.R.S. §§ 48-3609, 48-3610; and development within areas designated as Flood Hazard Zones located within city limits shall be subject to such rules and regulations as may be established by the State and the Flood Control District of Maricopa County... No Certificate of Occupancy, Certificate of Completion, or Temporary Certificate of Occupancy shall be issued by the City until the applicant provides to the City an approved finished construction Elevation Certificate approved by the Flood Control District of Maricopa County.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 22).
Full Breakdown
§§ 48-3609 and 48-3610; instead, development within Flood Hazard Zones inside city limits is governed by the State's and the District's rules under the National Flood Insurance Program, applied in addition to other Mesa code requirements. Section 9-11-2 designates the City Engineer as Floodplain Administrator, responsible for keeping current flood insurance rate maps and elevation certificates on file, forwarding floodplain development permit requests to the County, and coordinating with FEMA. Section 9-11-4 adopts by reference the county's 'Floodplain Management Regulations for Maricopa County' (dated January 17, 2018, as amended), and § 9-11-5 adopts the September 18, 2020 Flood Insurance Study and Flood Insurance Rate Maps as the basis for defining Special Flood Hazard Areas: both kept on file with the City Clerk.
Before the City will issue a Certificate of Occupancy, Certificate of Completion, or Temporary Certificate of Occupancy, § 9-11-3 requires the applicant to submit an approved finished-construction Elevation Certificate signed off by the County Flood Control District. Section 9-11-7 disclaims City liability for flood damage even where the regulations are followed, noting flood heights can be increased by man-made or natural causes.
Violations & Fines
Section 9-11-6 makes it a violation to develop land contrary to the Chapter or the adopted Floodplain Management Regulations. A first violation is a Class 2 Misdemeanor. Beyond criminal prosecution, the Building Safety Director may issue a stop-work order or withhold, suspend, or revoke a Certificate of Occupancy or Completion, and a violation is separately treated as a breach of A.R.S. Title 48, Chapter 21, Article 1, exposing the violator to the penalties in A.R.S. § 48-3615 plus injunctive relief the City may seek for any unauthorized diversion, retardation, or obstruction of a watercourse or Special Flood Hazard Area.
Frequently Asked Questions
Does Mesa run its own floodplain permit program?
Who administers floodplain rules in Mesa?
Can I get a Certificate of Occupancy without a flood elevation certificate?
What's the penalty for building in a flood hazard area without approval?
Sources & Official References
Other rules in Mesa
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Flood Zones in Nearby Cities
How other cities in Maricopa County handle flood zones.