Ontario, CA (ZIP 91761) has experienced 126 recorded natural disaster events based on federal and state agency records. These include 82 earthquakes, 32 wildfires, and 12 floods. Total documented property damage amounts to $268.5K. These events have resulted in 5 recorded deaths and 1 injury.
The dominant hazard type for Ontario is earthquakes, with 82 recorded events making up 65% of the area's disaster history. The most recent recorded earthquake occurred on Aug 6, 2025.
There have been 32 recorded wildfires in this area, representing 25% of all disaster events. The most recent recorded wildfire occurred on Nov 2, 2019.
There have been 12 recorded floods in this area, representing 10% of all disaster events. Of these, 6 (50%) were rated at severity level 4 or 5 — the most intense on the normalized scale. The highest recorded severity for flood-related events here is 5/5 (extreme). Flood-related events have caused a combined $268.5K in documented property damage. 5 fatalities have been attributed to floods in this area. The most recent recorded flood occurred on Nov 8, 2022.
The most significant disaster event on record for Ontario was Flash Flood on Jan 8, 2005, which caused $100K in property damage.
Explore disaster history for adjacent areas
Based on federal and state records, ZIP code 91761 has experienced 126 natural disaster events. The hazard types affecting this area include earthquakes (82 events), wildfires (32 events), and floods (12 events). The primary hazard is earthquakes, which account for 65% of all recorded events.
Earthquakes are the most frequently recorded hazard in Ontario, CA, with 82 events documented.
Yes, Ontario (ZIP 91761) has 12 recorded flood events. These floods have caused $268.5K in total property damage. The most recent flood on record occurred on Nov 8, 2022.
The most damaging natural disaster on record for ZIP code 91761 was Flash Flood, which occurred on Jan 8, 2005. This event caused $100K in documented property damage. It was rated at severity level 4/5.
Natural disasters have caused a documented total of $268.5K in property damage in the Ontario, CA area (ZIP 91761). This figure is based on historical records from FEMA, NOAA Storm Events Database, and USGS, and covers events from the 1950s through the present. Actual damages may be higher, as not all events have complete damage assessments.
Data sourced from FEMA (disaster declarations, NFIP flood claims), NOAA Storm Events Database, USGS Earthquake Hazards Program, and NIFC wildfire records. Historical coverage varies by source, with most records beginning in the 1950s–1970s. Full methodology →