Arizona Flood Zones Law: Statewide Environmental Rules Rules (2026)

Key Facts

Statute: ARS 48-3601 et seq.
Lead Agency: County flood control district
Floor Standard: NFIP minimums or stricter
State Coordinator: AZ Dept of Water Resources

Full Breakdown

ARS Title 48 Chapter 21 (ARS 48-3601 et seq.) establishes floodplain management as a county responsibility and authorizes county flood control districts to adopt regulations meeting at least National Flood Insurance Program minimums. Cities may administer floodplain rules within their boundaries by intergovernmental agreement, but standards must equal or exceed county and state minimums. Building or grading in a regulatory floodway without a floodplain use permit is prohibited. The Arizona Department of Water Resources oversees state coordination.

Violations & Penalties

Unpermitted floodplain development can result in stop-work orders, civil penalties up to several hundred dollars per day, mandatory removal, and loss of NFIP eligibility for the community.

Frequently Asked Questions

Do I need a permit to build in an Arizona floodplain?

Yes. Any structure, fill, grading, or substantial improvement in a mapped Special Flood Hazard Area requires a floodplain use permit from the county flood control district or delegated city, regardless of building size.

Can Arizona cities adopt weaker floodplain rules than the county?

No. State law requires city floodplain standards to be at least as strict as county and NFIP minimums. Communities that adopt weaker rules risk losing federal flood insurance availability for their residents.

Arizona Floodplain Management and County Flood Control Authority

Key Facts

Full Breakdown

Violations & Penalties

Frequently Asked Questions

Sources

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