2,442 flood insurance claims·$48.0M paid·13 federal flood & hurricane disasters
Share of the whole county outline, rivers and lakes included; parts FEMA hasn’t mapped count as zero.
Shaded areas are FEMA’s mapped flood hazard zones in and around San Diego County, California. Zoomed out they are simplified; at street level the map switches to FEMA’s exact layer. Tap anywhere to check that spot, or search an address above.
San Diego County flood risks are primarily characterized by flash flooding and river flooding, driven by hundreds of recorded events over the last 30 years alongside coastal floods, storm surges, and tropical storms. Heavy rain and snow driven by cold Pacific storms combined with atmospheric rivers can produce significant hazards, as demonstrated by events in February 2025 that brought heavy rainfall rates, debris flows, and flash flooding.
National Flood Insurance Program claims data indicates that properties across various zones experience distinct impacts. Zone X leads with 862 claims averaging $30,771 and an average recorded water depth of 22 inches, followed by Zone A with 816 claims averaging $48,531 and an average water depth of 7 inches. Unknown zones recorded 485 claims averaging $7,310 with an average water depth of 2 inches. Unshaded Zone X recorded 204 claims averaging $12,278 with a 3-inch average water depth, while Shaded Zone X logged 52 claims averaging $9,039 with a 2-inch average water depth.
Homeowners, real estate agents, and journalists should pay the closest attention to properties located in Zone X and Zone A, which account for the highest volume of insurance claims and the highest average payout amounts, as well as areas with unknown flood zone designations.
Summary written from NOAA storm reports and NFIP claims for this county. Not a prediction.
23% of San Diego County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.
1,092 NFIP claims with a recorded rated flood zone, 1978 to date. The zone is the one FEMA used to rate that policy, which may not match today’s map. Source: OpenFEMA NFIP claims.
In flood insurance claims here that reported a flood depth, the average was 10 inches.
Drawn to scale against an 80-inch door. Even a few inches soaks flooring, the bottom of the drywall and anything plugged in near the floor.
Average of the depths reported on claims (zero and implausible values left out); FEMA’s record doesn’t say exactly where each depth was measured. Source: OpenFEMA NFIP claims.
The worst year was 1980, with 257 claims and $1.6M paid, the year of Severe Storms, Mudslides & Flooding.
Bar height is scaled by square root so ordinary years stay visible next to the worst one. NFIP claims by year of loss. Source: OpenFEMA.
258 NOAA storm reports from San Diego County describe what happened, in the words of the forecasters who covered it. Read the California flood stories →
51 federal disaster declarations since 1965, 13 of them floods, coastal storms or hurricanes.
| Disaster | Began |
|---|---|
| Severe Storm And Flooding | Jan 21, 2024 |
| Severe Winter Storms, Flooding, And Mudslides | Jan 8, 2023 |
| Severe Winter Storms, Flooding, Landslides, And Mudslides | Dec 27, 2022 |
| Wildfires | Sep 4, 2020 |
| West Fire | Jul 6, 2018 |
| Lilac Fire | Dec 7, 2017 |
| Wildfires | Dec 4, 2017 |
| Wildfires, Flooding, Mudflows, And Debris Flows | Dec 4, 2017 |
Weather and water disasters only; most recent first. Source: OpenFEMA Disaster Declarations.
538 since 1996: 256 flash floods, 247 river or area floods and 30 coastal floods or surges.
| Event | Date | Damage |
|---|---|---|
| Flood | Sep 18, 2025 | — |
| Flood | Nov 15, 2025 | — |
| Flash Flood | Mar 13, 2025 | — |
| Flood | Feb 13, 2025 | — |
| Flash Flood | Mar 6, 2025 | — |
| Flood | Mar 30, 2024 | — |
| Flash Flood | Mar 30, 2024 | — |
| Flash Flood | Jan 22, 2024 | $200,000 |
— = no damage estimate in the record. Source: NOAA Storm Events Database.
Flood · Sep 18, 2025. Remnants from Mario influenced the region with increased instability and moisture, which allow for numerous reports of heavy rain, thunderstorms, flash flooding, and even a few reports of mudslides in San Bernardino County.
Flood · Nov 15, 2025. A strong area of low pressure impacts southern California with heavy rain, debris flow, flooding, and gusty winds across the higher terrain.
Flash Flood · Mar 13, 2025. A strong area of low pressure transitioned over the region and brought heavy rain, mountain snow, and some strong and gusty winds for the higher elevations and deserts.
Flood · Feb 13, 2025. A cold Pacific storm combined with an atmospheric river brought heavy rain and snow to southern California. 3 day precipitation amounts as high as 4 to 7 inches occurred in the San Bernardino Mountains. 1 hour rainfall mountains of 0.5 to 0.9 inches per hour were observed in the Santa Ana and San Bernardino/San Gabriel mountains. Total rainfall of 6 inches and a maximum one hour rate of 0.65 inches during the even…
National Weather Service narratives, lightly trimmed. Source: NOAA Storm Events Database.
Every colour on the map above is a place on this drawing: where the ground sits relative to the flood FEMA plans for.
If a building in San Diego County is in a high-risk zone (A or V) and its mortgage comes from a federally regulated or insured lender, or is federally backed, flood insurance is required.
Outside those zones it is optional, and often worth having: from 2014 to 2024 nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area. Since Risk Rating 2.0, NFIP premiums are set for each building, so the only reliable price is a quote: FloodSmart.gov or a local agent.