Contra Costa, CA
Contra Costa County in California has 11 FEMA disaster declarations on record covering 1969–2023, most recently Severe Winter Storms, Flooding, Landslides, and Mudslides on Jan 14, 2023 (DR-4683). Its flood risk grade is B (Moderate risk), ranking #150 of 3,277 U.S. counties, with 30 NFIP flood insurance claims totaling $1,005,011 in payouts. Flood risk is relatively low compared to the national average.
FEMA Disaster Declarations in Contra Costa County
The 11 most recent federally declared disasters affecting Contra Costa County, CA (1969–2023). Total declarations on record: 11.
| Declared | Incident Type | Title | FEMA Disaster # |
|---|---|---|---|
| Jan 14, 2023 | Flood | Severe Winter Storms, Flooding, Landslides, and Mudslides | DR-4683 |
| Jan 9, 2023 | Flood | Severe Winter Storms, Flooding, and Mudslides | DR-3591 |
| Apr 1, 2017 | Flood | Severe Winter Storms, Flooding, and Mudslides | DR-4308 |
| Mar 16, 2017 | Flood | Severe Winter Storms, Flooding, and Mudslides | DR-4305 |
| Sep 13, 2005 | Hurricane | Hurricane Katrina Evacuation | DR-3248 |
| Feb 3, 1993 | Flood | Severe Winter Storm, MUD & Land Slides, & Flooding | DR-979 |
| Feb 21, 1986 | Flood | Severe Storms & Flooding | DR-758 |
| Feb 9, 1983 | Coastal Storm | Coastal Storms, Floods, Slides & Tornadoes | DR-677 |
| Jan 7, 1982 | Flood | Severe Storms, Flood, Mudslides & High Tide | DR-651 |
| Feb 1, 1980 | Coastal Storm | Torrential Rain, High Tide & Winds | DR-3078 |
| Jan 26, 1969 | Flood | Severe Storms & Flooding | DR-253 |
Score Breakdown
The composite score of 21 is calculated from four weighted factors. See our methodology for details.
Other Counties in California
| County | Grade | Score | Claims | Disasters |
|---|---|---|---|---|
| Santa Cruz | B | 21 | 69 | 10 |
| Sonoma | B | 21 | 147 | 11 |
| San Joaquin | B | 22 | 17 | 13 |
| El Dorado | A | 20 | 16 | 9 |
| Shasta | A | 20 | 10 | 9 |
| Tulare | A | 20 | 21 | 9 |
More Counties in California
Frequently Asked Questions
How many FEMA disaster declarations does Contra Costa County, CA have?
Contra Costa County, CA has 11 federal disaster declarations on FEMA record (1969–2023). The 5 most recent are: Severe Winter Storms, Flooding, Landslides, and Mudslides (declared Jan 14, 2023, DR-4683); Severe Winter Storms, Flooding, and Mudslides (declared Jan 9, 2023, DR-3591); Severe Winter Storms, Flooding, and Mudslides (declared Apr 1, 2017, DR-4308); Severe Winter Storms, Flooding, and Mudslides (declared Mar 16, 2017, DR-4305); 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 Contra Costa County, CA?
Contra Costa County is graded B (composite score 21/100, moderate risk). It ranks #150 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 Contra Costa County?
30 NFIP flood insurance claims have been filed in Contra Costa County, CA, totaling $1,005,011 in payouts. The average claim is $33,500. Source: FEMA FimaNfipClaims v2 dataset.
Has Contra Costa County, CA had any recent flood disasters?
Yes. The most recent FEMA declaration affecting Contra Costa County was Severe Winter Storms, Flooding, Landslides, and Mudslides on Jan 14, 2023 (DR-4683). The county has 11 declared disasters in the OpenFEMA record covering 1969–2023.
For this entity, the underlying data on this page comes from FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims. The breakdown above is the federal record; the paragraphs below add the per-entity context that makes the headline numbers usable for a real decision rather than just a data lookup.
Every number on this page links back to FEMA OpenFEMA datasets including the National Flood Hazard Layer and NFIP claims; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
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.