Yavapai County, AZ Environmental Rules: Flood Elevation Requirements (2026)
Key Facts
- Governing section
- Subdivision Regulations § 456
- Floodplain standard
- ADWR riverine floodplain delineation
- Fully-in-floodplain lots
- Not permitted to be platted
- Building envelope
- Must sit outside flood hazard area
- Enforcing agency
- Yavapai County Flood Control District
- Pre-final inspection
- Elevation certificate required
Summary
Yavapai County subdivision plats crossing the 100-year floodplain must show the base flood elevation and a regulatory elevation for the most flood-prone point of every affected lot. Lots sitting entirely inside the flood hazard area cannot be created at all.
The limits of any one hundred (100) year floodplain identified using the standards set forth by the Director of the ADWR Requirement for Floodplain Delineation in Riverine Environments, together with the base flood elevation, shall be illustrated in the Final Plat. The regulatory elevation for the most critical location within each lot shall be shown on each lot that is impacted by the floodplain. All lots impacted by flood hazard areas must have an established restrictive building envelope that is outside the delineated flood hazard area. Lots completely within the one hundred (100) year flood hazard area will not be permitted, as this area should be reserved as open space for the conveyance of floodwaters.
Full Breakdown
Section 456 of the Yavapai County Subdivision Regulations requires every Final Plat touching a 100-year floodplain, delineated to the ADWR Requirement for Floodplain Delineation in Riverine Environments, to illustrate the floodplain limits and the base flood elevation on the plat itself. The regulatory elevation for the most critical point on each affected lot must also be shown. Beyond mapping the hazard, the section forces a design outcome: every lot touched by a flood hazard area must carry an established, restrictive building envelope located outside the delineated flood hazard area, and a lot that sits completely within the 100-year flood hazard area cannot be platted at all, because that ground is reserved as open space for floodwater conveyance.
The Final Plat must also carry a printed note warning that floodplain limits, base flood elevations and regulatory elevations can be revised by later studies approved by the Flood Control District, so a buyer relying on the plat is on notice the numbers can move. 11, Flood Control) hand all flood hazard area enforcement, including substantially improved and substantially damaged structures, over to the Yavapai County Flood Control District rather than the building official, and require a final elevation certificate documenting the lowest floor elevation before a building final inspection can be scheduled.
The Flood Control District, not the Planning and Zoning Department, reviews subdivision plat drainage and floodplain material before the Commission or Board acts on the plat.
Violations & Fines
Failing to show required floodplain and base flood elevation data on a Final Plat is grounds for the Department to reject the plat before it reaches the Commission or Board for review under Section 456. Building on a lot that has no building envelope outside the flood hazard area, or platting a lot lying entirely within the 100-year floodplain, is a Subdivision Regulations violation independent of any building-permit issue. On the construction side, skipping the required final elevation certificate blocks scheduling of the building final inspection, so occupancy cannot legally proceed until the Flood Control District approves the documented lowest-floor elevation.
Frequently Asked Questions
Can I subdivide a lot that sits entirely inside the 100-year floodplain in Yavapai County?
Does the Final Plat itself have to show the base flood elevation?
Who signs off on flood hazard construction before my final inspection?
Sources & Official References
Other rules in Yavapai County
Compare Yavapai County to another location·View the Arizona environmental rules overview
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