FEMA flood zone rules in Phoenix, AZ — also called floodplain regulations or special flood hazard area (SFHA) rules — determine flood insurance requirements and elevation standards for new construction.
Phoenix participates in the National Flood Insurance Program (NFIP) and regulates development in Special Flood Hazard Areas (SFHA) under City Code Chapter 32B (Floodplain Management Ordinance). The FH Zoning District (Section 657) imposes additional restrictions. The base flood is defined as the 1% annual chance (100-year) flood.
Phoenix has extensive FEMA-designated flood zones along the Salt River, Indian Bend Wash, Cave Creek, New River, Skunk Creek, and numerous desert washes. Flash flooding is one of the most dangerous weather hazards in the Phoenix desert — dry washes can fill rapidly during monsoon storms. Monsoon season runs from June 15 through September 30, bringing intense thunderstorms with heavy rainfall. The Flood Control District of Maricopa County manages regional drainage infrastructure. Properties in Special Flood Hazard Areas (SFHAs) require flood insurance with federally-backed mortgages under NFIP. New construction in flood zones must meet base flood elevation plus freeboard requirements. Phoenix participates in the Community Rating System (CRS) for reduced flood insurance premiums. Indian Bend Wash Greenbelt is a notable flood control project converting flood-prone areas into parks and golf courses. The 'Stupid Motorist Law' (ARS §28-910) allows drivers who enter flooded roadways to be charged for their rescue.
Building in flood zone without permit: stop-work order. Non-compliant construction: mandatory elevation or retrofit. NFIP non-compliance affects community eligibility.
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Side-by-side rule comparisons with other cities in Maricopa County.
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