Enter any address in Marin County, California to see its FEMA flood zone
Flooding from various sources has impacted Marin County over the last 30 years, with 95 flood events, 21 coastal flood events, and 19 flash flood events recorded. Recent events include widespread flooding and strong winds on February 13, 2025, and flooding along the Russian River near Guerneville due to an atmospheric river on February 4, 2025.
National Flood Insurance Program (NFIP) data shows that properties in Zone A have experienced the highest number of claims (1679) with an average payout of $20,235 and an average water depth of 2.8 feet. Properties in Zone X also show a significant average water depth of 5.3 feet with 160 claims.
Residents in coastal areas, those near rivers, and homeowners in zones with higher flood risk, such as Zone A and Zone X, should pay particular attention to flood preparedness and potential impacts.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
64 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Marin County, California has recorded 138 flood-related events since 1996 according to NOAA's Storm Events Database, including 19 flash floods and 95 river or area floods. The county has received 26 federal disaster declarations, 10 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1964–2023)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Winter Storms, Straight-line Winds, Flooding, Landslides, And Mudslides | Severe Storm | Feb 21, 2023 |
| Severe Winter Storms, Flooding, And Mudslides | Flood | Jan 8, 2023 |
| Severe Winter Storms, Flooding, Landslides, And Mudslides | Flood | Dec 27, 2022 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Winter Storms, Flooding, Landslides, And Mudslides | Severe Storm | Feb 24, 2019 |
| Severe Winter Storms, Flooding, And Mudslides | Flood | Feb 1, 2017 |
| Severe Winter Storms, Flooding, And Mudslides | Severe Storm | Jan 3, 2017 |
| Severe Storms, Flooding, Landslides, And Mudslides | Severe Storm | Mar 29, 2006 |
| Severe Storms, Flooding, Mudslides, And Landslides | Severe Storm | Dec 17, 2005 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flood | Dec 22, 2025 | 0.00K |
| Flood | Nov 17, 2025 | 0.00K |
| Flood | Feb 13, 2025 | 0.00K |
| Flood | Feb 4, 2025 | 0.01K |
| Flood | Jan 31, 2024 | 0.00K |
| Flood | Dec 29, 2024 | 0.00K |
| Flood | Dec 27, 2024 | 0.00K |
| Flood | Dec 26, 2024 | 0.01K |
| Flood | Jan 22, 2024 | 0.01K |
| Flood | Nov 21, 2024 | 0.00K |
Flood — Dec 22, 2025
A series of storm systems impacted the Bay Area and Central Coast from December 19 to 25th, impacting Christmas holiday travel across the region. The most impactful systems arrived on Christmas Eve and Christmas Day. Two tornado warnings were issued for the coastal regions of San Mateo and Santa Cruz counties based off radar indicated rotation. San Francisco International Airport reported delay...
Flood — Nov 17, 2025
A low pressure system brought rain and winds to the Bay Area and Central Coast on November 16 and 17th. Special Marine Warnings and Special Weather Statements were issued due to isolated thunderstorms causing localized heavy rain and gusty winds. The main frontal rain band came through in the overnight hours, with isolated to scattered showers and some thunderstorms continuing into the 17th.
Flood — Feb 13, 2025
A winter storm on February 13 caused widespread flooding and strong winds across the Bay Area and Central Coast.
Flood — Feb 4, 2025
An intense atmospheric river impacted the Bay Area from February 3rd to the 4th, bringing heavy rain and strong wind to the region, especially across the North Bay. The Russian River near Guerneville flooded due to the heavy rain.
Flood — Jan 31, 2024
A quick-moving cold front came through California on January 31, bringing widespread rain and high winds. A narrow cold frontal rainband (NCFR) developed during the afternoon and evening commute, with moderate to heavy rain across the region as a result. Impacts and post-frontal showers continued through February 1.
Source: NOAA National Weather Service Storm Events Database.
Source: OpenFEMA NFIP Individual Claims (2.25M records analyzed).
FEMA assigns flood zone designations to areas in Marin County, California:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Marin County, California that are in FEMA-designated Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
Even outside high-risk zones, flood insurance is recommended. From 2014 to 2024, nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area.
Visit FloodSmart.gov to find an agent and get a quote.