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Flooding in San Diego WHAT YOU NEED TO KNOW

Flooding might not be the first thing that comes to mind when you think of San Diego, but it's a growing concern, and it affects more neighborhoods than you might expect. Climate change is likely to result in greater year-to-year variability in rainfall and more extreme shifts between periods of drought and floods. There are already some spots in San Diego that flood when there are heavy rain events. As future rain events get stronger, the areas of impact by flooding are estimated to expand. Understanding when, where, and why floods happen, can help you make smarter decisions about protecting your property by purchasing private flood insurance in San Diego, CA.

Flood Zones in San Diego

San Diego County includes a mix of high-risk and moderate-to-low-risk flood zones, designated by FEMA. If your property is in a Zone AE or VE, you’re considered high-risk and may be required to carry flood insurance—especially if you have a federally backed mortgage. Areas in Zone X are lower risk but still file thousands of flood claims each year. In fact, data from FEMA indicates that 40% of flood insurance claims come from locations which are not rated as high risk.

Some flood-prone areas in San Diego include:

  • Mission Valley (ZIP codes: 92108, 92110) – prone to flooding from the San Diego River.
  • Pacific Beach & Ocean Beach (ZIP codes: 92109, 92107) – at risk from coastal storm surge and tidal flooding.
  • Chollas Creek, Southcrest, and Barrio Logan (ZIP codes: 92102, 92113, 92105) – vulnerable during intense rainfall.
  • Canyon and foothill areas – especially after wildfires when soil can’t absorb water.

Looking to purchase private flood insurance in San Diego, CA, but not sure what flood zone you're in? Our team of expert advisors at Advantage Flood can help you look it up and assess your risk—for free.

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When is flood season in San Diego

San Diego’s flood season typically runs from November through March, when Pacific storms bring heavy rain, especially during El Niño years. Just in 2024, a record breaking storm dropped 2.7 inches of water in 24 hours, the highest precipitation since 1850. These atmospheric river events can drop several inches of rain in a short time, overwhelming local infrastructure. Even one strong storm can lead to flooded streets, homes, and basements—particularly in older neighborhoods or areas near canyons and creeks. This makes getting private flood insurance in San Diego, CA, an especially prudent idea.

Common causes of flooding in San Diego

Flooding here isn’t just about coastal storm surge. In fact, some of the most damaging floods happen inland and are caused by:

Sudden downpours and flash flooding

Overflowing storm drains and urban runoff

Wildfire burn scars that reduce soil absorption

Rising water from creeks, rivers, or lagoons

Tidal flooding in low-lying beach communities

Heavy rainfall overwhelming infrastructure in urban areas

Even if you’ve never experienced a flood, these events can happen without warning, making getting private flood insurance in San Diego, CA a smart and proactive move.

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