Flood Risk in Napa, CA: 1,159 FEMA Claims
Historical NFIP data for Napa contains 1,159 claims. Among 2 ZIP codes with claim records, 1% have an A- or V-family dominant rated zone recorded in those claims. This is not current property-map coverage.
1% A/V-family among 2 claim-record ZIPs · 1,159 FEMA claims · Updated
Data: FEMA National Flood Insurance Program (NFIP), FEMA Hazard Mitigation Last verified:
What are FEMA flood zones?
FEMA classifies properties into flood zones based on flood probability. The local percentage shown on this page comes only from rated-zone values recorded in historical NFIP claims and is not a complete current map inventory. Check a specific address on FEMA's Flood Map Service Center.
How are flood insurance claims calculated?
The NFIP dataset records insurance claims and reported building, contents, and ICC payment components. A claim is an insurance record, not a one-to-one count of flood events or a current property-level risk classification.
Flood Risk Overview
Among ZIP codes with NFIP claim records in Napa, California, 1% have an A- or V-family dominant recorded rated zone in those historical claims. This claims-only evidence is not a complete current FEMA property-map inventory. A total of 1,159 flood insurance claims have been filed through NFIP. Reported building, contents, and ICC payment components sum to $25.8M across 964 claims with payment data. Another 195 claims lack reported payment fields; missing values are not counted as zero.
The average reported building, contents, and ICC component sum among claims with payment data is $27K.
Understanding Flood Zones
FEMA classifies areas into flood zones based on risk:
| Zone | Risk Level | Description |
|---|---|---|
| A, AE, AH, AO | High | 1% annual chance of flooding (100-year floodplain) |
| V, VE | Very High | Coastal areas with wave action |
| B, X (shaded) | Moderate | 0.2% annual chance (500-year floodplain) |
| C, X (unshaded) | Low | Minimal flood risk |
Important: Even "low risk" areas experience flooding. Over 40% of NFIP claims come from outside high-risk zones.
Flood Insurance in Napa
Standard homeowner's insurance does not cover flood damage. Options include:
National Flood Insurance Program (NFIP)
- Available through any insurance agent
- Maximum coverage: $250,000 for building, $100,000 for contents
- Average annual premium: $700–$1,500
- 30-day waiting period before coverage begins
Private Flood Insurance
- Often more coverage at lower premiums
- Faster claims processing
- May offer replacement cost coverage (NFIP pays actual cash value)
Required? If you have a federally backed mortgage and are in a Special Flood Hazard Area (SFHA), flood insurance is mandatory.
How Flooding Affects Drinking Water
Flooding poses direct threats to drinking water quality:
- Water treatment plant overflow - systems can be overwhelmed, leading to untreated or partially treated water
- Sewage contamination - floodwater mixes with sewage systems, introducing bacteria and pathogens
- Agricultural runoff - pesticides, fertilizers, and animal waste enter water supplies
- Well contamination - private wells are especially vulnerable to floodwater infiltration
- Infrastructure damage - pipes can break, creating entry points for contaminants
After a flood event, always follow local boil water advisories and avoid using tap water until the all-clear is given.
FEMA Flood Map for Napa
To check your exact flood zone designation in Napa, use the official FEMA Flood Map Service Center:
- FEMA Flood Map Service Center - enter your address to see your flood zone
- FEMA National Flood Hazard Layer - interactive map viewer
Flood zone distribution of claims in Napa:
| FEMA Zone | Claims | Risk Level |
|---|---|---|
| AE | 536 | High (100-yr floodplain) |
| A09 | 224 | High (100-yr floodplain) |
| A | 82 | High (100-yr floodplain) |
| X | 52 | Moderate-Low |
| C | 51 | Minimal |
| A05 | 45 | High (100-yr floodplain) |
NFIP Claims History
| Metric | Value |
|---|---|
| Total claims filed | 1,159 |
| Reported payment-component sum | $25.8M |
| Claims with payment data | 964 |
| Claims without payment fields | 195 |
| Average among claims with payment data | $27K |
| Claims in 2022 through 2026-07-27 | 1 |
| Recent reported payment-component sum | $26K |
| ZIP codes monitored | 3 |
| Population | 92,380 |
Among claims with known loss dates, 0% fall in the 2022 through 2026-07-27 window.
Financial Impact of Flooding in Napa
Reported building, contents, and ICC payment components for Napa sum to $25.8M across 964 claims with payment data. Payment fields are absent for 195 additional claims and are not treated as zero.
| Impact Metric | Value |
|---|---|
| Average reported component sum | $27K |
| Reported payment-component sum | $25.8M |
| Claims per 1,000 residents | 12.5 |
| Reported payment-component sum per capita | $279 |
Property value impact: Homes in FEMA-designated flood zones typically sell for 4–7% less than comparable homes outside flood zones. Mandatory flood insurance requirements add $700–$1,500/year in carrying costs.
Weather Alerts & Flood Warnings
The National Weather Service (NWS) issues flood watches and warnings for the Napa area. Monitor these resources:
- NWS Weather Alerts - real-time severe weather alerts by location
- Weather.gov California - state-level active alerts
- FEMA Emergency Alerts - IPAWS integrated alerts
Alert types for Napa area:
| Alert Type | Meaning | Action |
|---|---|---|
| Flood Watch | Flooding is possible | Prepare to move to higher ground |
| Flood Warning | Flooding is occurring or imminent | Take action immediately |
| Flash Flood Warning | Flash flooding within hours | Move to high ground now |
| Coastal Flood Advisory | Minor coastal flooding | Monitor conditions |
Set up Wireless Emergency Alerts (WEA) on your phone to receive automatic flood warnings for Napa.
Protecting Your Home from Flooding
Before a flood:
- Know your flood zone - check FEMA's map
- Install sump pump with battery backup
- Elevate electrical systems, furnace, and water heater above potential flood levels
- Apply waterproof sealant to basement walls and floors
- Keep gutters and downspouts clear
During a flood:
- Move to higher ground immediately
- Do not walk or drive through floodwater
- Turn off utilities if instructed
- Monitor local emergency alerts
After a flood:
- Do not drink tap water until the boil water advisory is lifted
- Document damage with photos for insurance claims
- Watch for mold growth in the following weeks
- Have your water tested before resuming normal use
ZIP Codes in Napa
Napa covers 3 ZIP codes. Flood risk varies by ZIP code based on elevation, proximity to water bodies, and drainage infrastructure. Check your specific ZIP code for detailed flood zone mapping.
Data Sources
- Flood claims: FEMA National Flood Insurance Program (NFIP)
- Flood zones: FEMA Flood Map Service Center
- Water quality impact: EPA Emergency Response guidance
Source reporting periods vary. See each cited source for its publication schedule.
Flood Risk by ZIP Code in Napa
Flood risk varies across Napa's 3 ZIP codes based on elevation, proximity to water bodies, and drainage infrastructure.
| ZIP Code | Grade | Score | Violations | |
|---|---|---|---|---|
| 94558 | N/A | /100 | 2 | View report → |
| 94559 | N/A | /100 | 0 | View report → |
| 94581 | N/A | /100 | 0 | View report → |