Flood Zones: Hesperia vs Ontario
How do flood zones rules compare between Hesperia, CA and Ontario, CA?
Ontario has fewer restrictions than Hesperia.
Hesperia, CA
San Bernardino County
Hesperia regulates development in special flood hazard areas (SFHAs) under Hesperia Municipal Code Chapter 8.28 (Flood Hazard Protections Regulations), implementing the National Flood Insurance Program (NFIP). The city's Floodplain Administrator (Cassandra Sanchez, (760) 947-1059) reviews proposed development in mapped FEMA flood zones. The city's website warns that current FIRMs are out of date and many formerly rural areas lack detailed mapping; a flood map modernization effort is underway. Property-specific flood risk can be checked via the city's GIS viewer at hesperia.geoviewer.io or the FEMA Map Service Center.
View full Hesperia rules →Ontario, CA
San Bernardino County
Most of Ontario is in FEMA Zone X (minimal hazard), but areas near Cucamonga Creek and the Chino Basin are in Zone AE and require lowest floors 1 foot above Base Flood Elevation under OMC Chapter 28.
View full Ontario rules →Key Facts Comparison
| Fact | Hesperia | Ontario |
|---|---|---|
| Local ordinance | HMC Chapter 8.28 — Flood Hazard Protections Regulations | - |
| Floodplain Administrator | Cassandra Sanchez, (760) 947-1059 | - |
| Map status | City reports current FIRMs are out of date; modernization underway | - |
| Federal floor | 44 CFR Part 60 (NFIP minimum standards) | - |
| Primary zone | - | Zone X (minimal) |
| High-risk areas | - | Zone AE Cucamonga / Deer Creek |
| Freeboard | - | 1 ft above BFE |
| Map date | - | August 28, 2008 |
Highlighted rows indicate differences between cities.
Hesperia FAQ
How do I find out if my Hesperia property is in a flood zone?
Use the FEMA Map Service Center (msc.fema.gov) by address, the city's GIS viewer at hesperia.geoviewer.io, or call the Floodplain Administrator at (760) 947-1059. The city warns current FIRMs are out of date and detailed mapping is missing in some formerly rural areas.
Can I build in a Hesperia flood zone?
Yes, but development in a special flood hazard area requires review under HMC Chapter 8.28 (Flood Hazard Protections Regulations) and must meet NFIP standards at 44 CFR Part 60 — base flood elevation, anchoring, flood-resistant materials, and no obstruction of regulatory floodways.
Ontario FAQ
Do I need flood insurance in Ontario?
Only if your property is mapped in a Special Flood Hazard Area (Zone AE) and you carry a federally backed mortgage.
How do I check my flood zone?
Use the FEMA Map Service Center at msc.fema.gov and enter your Ontario street address.
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