Riverside, CA
Riverside County in California has 16 FEMA disaster declarations on record covering 1965–2023, most recently Tropical Storm Hilary on Nov 21, 2023 (DR-4750). Its flood risk grade is A (Low risk), ranking #615 of 3,277 U.S. counties, with 22 NFIP flood insurance claims totaling $257,431 in payouts. Flood risk is relatively low compared to the national average.
FEMA Disaster Declarations in Riverside County
The 16 most recent federally declared disasters affecting Riverside County, CA (1965–2023). Total declarations on record: 16.
| Declared | Incident Type | Title | FEMA Disaster # |
|---|---|---|---|
| Nov 21, 2023 | Hurricane | Tropical Storm Hilary | DR-4750 |
| Jan 9, 2023 | Flood | Severe Winter Storms, Flooding, and Mudslides | DR-3591 |
| Mar 16, 2017 | Flood | Severe Winter Storms, Flooding, and Mudslides | DR-4305 |
| Jan 26, 2011 | Flood | Severe Winter Storms, Flooding, and Debris and MUD Flows | DR-1952 |
| Sep 13, 2005 | Hurricane | Hurricane Katrina Evacuation | DR-3248 |
| Feb 3, 1993 | Flood | Severe Winter Storm, MUD & Land Slides, & Flooding | DR-979 |
| Sep 22, 1983 | Flood | Flash Flooding | DR-690 |
| Jul 1, 1983 | Flood | Flooding | DR-687 |
| Feb 9, 1983 | Coastal Storm | Coastal Storms, Floods, Slides & Tornadoes | DR-677 |
| Feb 21, 1980 | Flood | Severe Storms, Mudslides & Flooding | DR-615 |
| Jul 27, 1979 | Flood | Heavy Rains, Flash Floods & MUD Flows | DR-594 |
| Feb 15, 1978 | Flood | Coastal Storms, Mudslides & Flooding | DR-547 |
| Sep 21, 1976 | Flood | Flooding, Tropical Storm Kathleen | DR-521 |
| Jan 26, 1969 | Flood | Severe Storms & Flooding | DR-253 |
| Jan 2, 1967 | Flood | Severe Storms & Flooding | DR-223 |
| Dec 7, 1965 | Flood | Heavy Rains & Flooding | DR-211 |
Score Breakdown
The composite score of 15 is calculated from four weighted factors. See our methodology for details.
Other Counties in California
| County | Grade | Score | Claims | Disasters |
|---|---|---|---|---|
| Humboldt | A | 15 | 3 | 14 |
| Mendocino | A | 15 | 1 | 13 |
| Ventura | A | 15 | 26 | 12 |
| San Luis Obispo | A | 14 | 18 | 12 |
| San Bernardino | A | 14 | 20 | 15 |
| Kern | A | 17 | 13 | 10 |
More Counties in California
Frequently Asked Questions
How many FEMA disaster declarations does Riverside County, CA have?
Riverside County, CA has 16 federal disaster declarations on FEMA record (1965–2023). The 5 most recent are: Tropical Storm Hilary (declared Nov 21, 2023, DR-4750); Severe Winter Storms, Flooding, and Mudslides (declared Jan 9, 2023, DR-3591); Severe Winter Storms, Flooding, and Mudslides (declared Mar 16, 2017, DR-4305); Severe Winter Storms, Flooding, and Debris and MUD Flows (declared Jan 26, 2011, DR-1952); Hurricane Katrina Evacuation (declared Sep 13, 2005, DR-3248). Counts include flood, severe storm, hurricane, and coastal storm declarations from the OpenFEMA DisasterDeclarationsSummaries dataset.
What is the flood risk grade for Riverside County, CA?
Riverside County is graded A (composite score 15/100, low risk). It ranks #615 of 3,277 U.S. counties for flood risk in our scoring model. The grade combines NFIP claims density (40%), disaster frequency (25%), claim severity (20%), and year-over-year trend (15%).
How many NFIP flood insurance claims have been filed in Riverside County?
22 NFIP flood insurance claims have been filed in Riverside County, CA, totaling $257,431 in payouts. The average claim is $11,701. Source: FEMA FimaNfipClaims v2 dataset.
Has Riverside County, CA had any recent flood disasters?
Yes. The most recent FEMA declaration affecting Riverside County was Tropical Storm Hilary on Nov 21, 2023 (DR-4750). The county has 16 declared disasters in the OpenFEMA record covering 1965–2023.
this entity is one of the data points covered by this site’s U.S. flood risk, NFIP claims, and disaster declarations dataset. The detail above comes directly from FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims; the context that follows situates the headline numbers against the broader distribution across U.S. ZIPs, counties, and states.
The methodology behind every numeric value on this page is publicly documented on the FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for this entity’s peers within U.S. ZIPs, counties, and states. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Source: FEMA OpenFEMA datasets, 2026.