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Pinal County, AZ Environmental Rules: Flood Zones (2026)

Some Restrictions

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

FEMA flood zone rules in Pinal County, AZ, 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: Floodplain use permit before any development
Critical facilities threshold: Also required in 0.2% annual chance floodplain
Large subdivisions: BFE data required over 50 lots or 5 acres
Issuing office: Pinal County Floodplain Administrator
Unpermitted development: Misdemeanor plus public nuisance per se
Abatement deadline: Administrator must act within 30 days

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 Pinal County, AZ.

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 Pinal County, AZ on the FEMA flood map

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

Summary

Anyone building, placing a manufactured home, filling, or putting up a wall or fence inside a regulatory floodplain or erosion hazard zone in unincorporated Pinal County must first get a floodplain use permit from the Floodplain Administrator. Critical facilities need one even in the wider 0.2 percent annual chance floodplain.

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

A floodplain use permit shall be obtained before construction or development, including placement of manufactured homes, structures, and accessory structures, construction of walls or fences, and additions, modifications or repairs to an existing structure, within any regulatory floodplain or erosion hazard zone. ... For critical facilities/critical structures, ... a floodplain use permit shall be required prior to the start of any construction, development, addition, repair, or modification within regulatory floodplain, or 0.2 percent annual chance floodplain or erosion hazard zone.

View official code

Full Breakdown

010 of the Pinal County Floodplain Management Ordinance requires a floodplain use permit before any construction or development inside a regulatory floodplain or erosion hazard zone, expressly covering placement of manufactured homes, new structures and accessory structures, construction of walls or fences, and additions, modifications or repairs to existing structures. 2 percent annual chance (500-year) floodplain or erosion hazard zone. 030. 030(B) criteria. Larger or more sensitive proposals can trigger a further engineering study of the development's effect on flood heights, velocities, sedimentation and channel capacity. § 48-3613 for any development that diverts, retards or obstructs a watercourse's flow where it creates a hazard to life or property.

Violations & Fines

Developing in a regulatory floodplain without the Section 5.05.010 permit, or without the written A.R.S. § 48-3613 authorization, is unlawful under Section 8.15.010, and any violation of the ordinance is a misdemeanor under Sections 8.15.020 and 8.15.030, with each day counted as a separate offense. Under Section 8.15.050, unauthorized structures, fill or excavation in a floodplain since August 8, 1973 are a public nuisance per se that the county or state may abate. The Floodplain Administrator must act within 30 days of discovering a violation, per Section 8.15.060.

Frequently Asked Questions

Do I need a permit to build a fence in a Pinal County floodplain?

Yes. Section 5.05.010 lists construction of walls or fences among the activities that require a floodplain use permit from the Floodplain Administrator before work starts, alongside new structures, accessory structures, manufactured homes, and additions or repairs to existing buildings within a regulatory floodplain or erosion hazard zone.

Are hospitals and fire stations held to a stricter floodplain standard?

Yes. Section 5.05.020 requires critical facilities and critical structures, including hospitals, nursing homes, police and fire stations, jails and emergency operation centers, to obtain a floodplain use permit even within the wider 0.2 percent annual chance floodplain, not just the one percent (100-year) regulatory floodplain that applies to ordinary development.

What happens if I build in the floodplain without a permit?

Unpermitted development is unlawful under Section 8.15.010 and a misdemeanor under Sections 8.15.020 and 8.15.030, with each day of continued violation a separate offense. Section 8.15.050 also makes it a public nuisance per se, and the Floodplain Administrator must move to abate, require a permit, or issue a variance within 30 days of discovering it.

Does a large subdivision need extra floodplain paperwork?

Yes. Section 5.05.040(A)(4) requires base flood elevation data for any subdivision or development proposal larger than 50 lots or five acres, whichever is smaller, in addition to the standard elevation and drainage plans the Floodplain Administrator can require for a floodplain use permit application.

Sources & Official References

[1]Pinal County Floodplain Management Ordinance, Ch. 5.05 (Development Services Code and Floodplain Management)

Other rules in Pinal County

Parking Rules: Overnight ParkingSome Restrictions Parking Rules: Street Parking LimitsSome Restrictions Noise Ordinances: Quiet HoursSome Restrictions Stormwater ManagementSome Restrictions Erosion ControlSome Restrictions Flood Elevation RequirementsSome Restrictions Noise Ordinances: Aircraft NoiseFew Restrictions Noise Ordinances: Amplified Music & Outdoor SoundSome Restrictions Noise Ordinances: Decibel LimitsSome Restrictions

All Pinal County rules

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