242 flood insurance claims·$4.7M paid·7 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 Stanislaus 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.
Prolonged winter storms bringing heavy rainfall, river and creek overflow, and mountain snow dominate the flood risk in Stanislaus County. Over the last 30 years, the NOAA Storm Events Database records 25 flood events resulting in 2 deaths. Recent severe impacts include a major winter storm in February 2024 that brought heavy rain, urban and road flooding, rising waterways, and multiple fatalities, as well as a major winter storm in January 2023 that caused renewed flooding of elevated waterways, road and urban flooding, and mudslides.
Federal Emergency Insurance Program records indicate that flood risks extend beyond high-risk zones. Zone A accounts for the highest claim volume with 149 claims averaging a $24,127 payout and an average recorded water depth of 7 inches. However, properties in shaded and unshaded Zone X areas also experience significant impacts. Zone X (shaded) recorded 31 claims with an average payout of $37,352 and an average recorded water depth of 9 inches, while Zone X (unshaded) recorded 32 claims averaging a $24,625 payout with an average recorded water depth of 10 inches.
Homeowners, real estate agents, and journalists should pay the closest attention to properties located near rivers, creeks, and urban drainage areas, as well as homes situated in both FEMA Zone A and Zone X designations where historical claims confirm damaging flood depths.
Summary written from NOAA storm reports and NFIP claims for this county. Not a prediction.
30% of Stanislaus County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.
212 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 7 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 1998, with 73 claims and $767,659 paid, the year of Severe Winter Storms and 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.
9 NOAA storm reports from Stanislaus County describe what happened, in the words of the forecasters who covered it. Read the California flood stories →
20 federal disaster declarations since 1964, 7 of them floods, coastal storms or hurricanes.
| Disaster | Began |
|---|---|
| Severe Winter Storms, Flooding, Landslides, And Mudslides | Mar 9, 2023 |
| Severe Winter Storms, Straight-line Winds, Flooding, Landslides, And Mudslides | Feb 21, 2023 |
| Severe Winter Storms, Flooding, And Mudslides | Jan 8, 2023 |
| Severe Winter Storms, Flooding, Landslides, And Mudslides | Dec 27, 2022 |
| Scu Ligtning Complex Fire | Aug 20, 2020 |
| Wildfires | Aug 14, 2020 |
| Severe Winter Storms, Flooding, And Mudslides | Feb 1, 2017 |
| Severe Freeze | Jan 11, 2007 |
Weather and water disasters only; most recent first. Source: OpenFEMA Disaster Declarations.
25 since 1996: 25 river or area floods.
| Event | Date | Damage |
|---|---|---|
| Flood | Dec 24, 2025 | — |
| Flood | Jan 22, 2024 | — |
| Flood | Feb 4, 2024 | — |
| Flood | Mar 29, 2023 | — |
| Flood | Dec 18, 2023 | — |
| Flood | Mar 14, 2023 | — |
| Flood | Jan 9, 2023 | — |
| Flood | Dec 31, 2022 | — |
— = no damage estimate in the record. Source: NOAA Storm Events Database.
Flood · Dec 24, 2025. A prolonged period of wet weather brought heavy snowfall and strong winds to the Sierra Nevada. Heaviest snowfall was observed from 12/24-12/26 when snow levels came down below the mountain passes. Snowfall measurements over the 12/24-12/26 timeframe were around 2-5 ft per Caltrans, Ski resorts, and UC Berkeley Central Sierra Snow Lab. Southerly wind gusts of 50-80 mph were observed as well across the Valley, foot…
Flood · Jan 22, 2024. Two storms brought heavy mountain snow with mountain travel delays and chain restrictions, widespread rain with flooding impacts, and thunderstorms to the area around the third week of January.
Flood · Feb 4, 2024. A major winter storm moved in from the south on February 4th, bringing heavy rain, strong winds, thunderstorms and heavy mountain snow through February 7th. Damaging winds brought down trees and caused widespread power outages. Flooding and strong winds resulted in multiple fatalities. Chain controls were observed in the mountains. Heavy rain brought nuisance flooding on roads and urban areas and rises to rivers,…
Flood · Mar 29, 2023. A strong winter storm brought moderate to heavy rain with with flooding of roadways, streams and creeks, with mudslides also reported. There was continued river flooding along the already elevated Sacramento, San Joaquin, Cosumnes, Mokelumne, and Tuolumne rivers. The storm brought dangerous mountain travel conditions with snow levels around down to 2000 feet, locally 1000 feet in Shasta County. Storm totals reach…
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 Stanislaus 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.