94558 Climate & Property Risk Report
Free address-level climate risk context for 94558 in Napa, California. Flood, wildfire, hurricane, earthquake, and heat — with insurance estimates and buyer guidance.
Napa, California 94558, United States
Data retrieved: Jun 22, 2026 at 16:32 UTC
Overall Risk
Above the national median (top 20% most at-risk)
County-level composite
Est. Annual Insurance
$2,730 – $4,937
Directional range
Premium Strain
4.19% of median income
high
Flood Insurance
Not required
Parcel falls outside SFHA
Insurance Market Context
These scores are county-level composites derived from FEMA National Risk Index. Individual parcels may differ significantly. This is not a property appraisal.
Market Pressure
SEVERE
California's admitted-carrier market is severely contracted. A broker who specializes in last-resort coverage (state FAIR Plan or residual market) is essential.
Admitted Market Share
52%
Carriers exiting at 9.8% YoY in California.
Residual Market
$3,200–$8,500
annual · last-resort
FAIR Plan / Citizens exposure up 424% since 2020.
Premium Strain Index
Insurance is roughly 4.2% of median household income — well above the 2% middle-income affordability benchmark (First Street flags anything above 5% as financially unsustainable).
Premium-to-income ratio. Based on state Department of Insurance filings, average annual premiums in this area range from $2,730 to $4,937. Not an insurance quote. The First Street 12th National Risk Assessment characterizes any ZIP above 5% as financially unsustainable.
Napa County Hazard Breakdown
Scores below are from the federal National Risk Index at the county level, refined with parcel-level signals where available (FEMA NFHL for flood, USDA WHP for wildfire, USGS PGA for earthquake, NWS for heat).
Data pending
Hurricane
Low riskTop 5% most at-risk nationally
Earthquake
ExtremeAbove the national median (top 33% most at-risk)
Extreme Heat
HighBelow the national median (safer than most)
Flood
LowAbove the national median (top 39% most at-risk)
Wildfire
HighBottom 20% nationally (safer than most)
Severe Storm / Tornado
MinimalWhat each hazard means for you
Expand any card to see the federal source citation and the buyer-specific action items our research team recommends for this hazard profile.
Hurricane Risk
NRI hurricane risk: Bottom 20% nationally (safer than most) for hurricane exposure (county-level, based on historical storm tracks and wind-speed exceedance).
FEMA · National Risk Index (HRCN)
Earthquake Risk
Top 5% most at-risk nationally for earthquake exposure. USGS PGA: 0.826g (site class D). NRI county percentile: Top 5% most at-risk nationally.
USGS · Design Maps (ASCE 7-16) + NRI
Extreme Heat
Long-term heat risk: Above the national median (top 33% most at-risk) (NRI county baseline). This reflects multi-decadal extreme-heat exposure, not the current week's weather.
NOAA · National Risk Index (HWAV)
Flood Risk
Parcel is in FEMA Flood Zone X – AREA OF MINIMAL FLOOD HAZARD. County NRI flood risk: Top 5% most at-risk nationally. The parcel is outside the mapped river/coastal floodplain, but the surrounding county has significant stormwater, urban flash-flood, and coastal surge-backup exposure.
FEMA · NFHL + National Risk Index
Wildfire Risk
Wildfire risk: Above the national median (top 39% most at-risk). USDA Wildfire Hazard Potential at parcel: Very Low (Class 1/5). County NRI wildfire risk: Top 5% most at-risk nationally. California buyers should independently verify Cal Fire Very High Fire Hazard Severity Zone (VHFHSZ) status; local zoning can impose stricter wildfire requirements than federal parcel data suggests.
USDA · WHP + National Risk Index
Severe Storm / Tornado
Severe storm / wind risk: Bottom 20% nationally (safer than most). Southern California sees winter storm fronts, straight-line wind, and occasional weak tornadoes, but not the violent tornado climatology of the Great Plains. The high NRI percentile is driven largely by population and property density in Los Angeles County.
FEMA · National Risk Index (TRND)
Lower-risk alternatives nearby
Communities within 25 miles of Napa with a measurably lower composite climate risk. Useful as a comp set when evaluating whether to negotiate on this address or pivot to a nearby one.
Santa Rosa, CA
Top 5% most at-risk nationally
24 miles away
FEMA Flood Zone
Is this specific parcel in a Special Flood Hazard Area?
The free address snapshot queries FEMA NFHL point-in-polygon and returns your exact FEMA Flood Zone (A, AE, X, etc.) in seconds.
Run a free address lookupCarrier Outlook
California's admitted-carrier market is severely contracted. A broker who specializes in last-resort coverage (state FAIR Plan or residual market) is essential.
Data Sources
Data Sources & Methodology
FEMA— NFHL + National Risk Index
Retrieved June 22, 2026
FEMA— National Risk Index (HRCN)
Retrieved June 22, 2026
USDA— WHP + National Risk Index
Retrieved June 22, 2026
USGS— Design Maps (ASCE 7-16) + NRI
Retrieved June 22, 2026
NOAA— National Risk Index (HWAV)
Retrieved June 22, 2026
FEMA— National Risk Index (TRND)
Retrieved June 22, 2026
What buyers should know
Buying in 94558: a risk primer
Before you write an offer on a home in Napa, understand how climate and insurance costs affect long-term ownership in 94558.
94558 in Napa, California, scores above the national median (top 20% most at-risk) on our composite climate-risk index. That ranking reflects the combined influence of earthquake shaking risk (96), extreme heat exposure (67), and wildfire exposure (61) in this ZIP code. Before writing an offer, buyers should understand which hazard drives the score and how it shows up in insurance premiums and long-term maintenance costs.
The data below is assembled from five federal sources — FEMA (flood and National Risk Index), NOAA (storm history and heat), USGS (seismic design), and USDA (wildfire hazard potential) — and is refreshed quarterly. Use it as a starting point for due diligence, not a substitute for a licensed inspector, structural engineer, or insurance agent.
Earthquake risk in 94558
The earthquake shaking risk score for 94558 is 96 (extreme), which is well above the national median. 94558 sits in a seismically active area with high expected shaking (PGA). Standard homeowners insurance does not cover earthquake damage; a separate earthquake policy is required. In California, deductibles are typically 10–20% of the dwelling limit, so the policy only matters for catastrophic loss.
For a specific address inside 94558, this score can shift meaningfully. A home on a ridge may have lower flood exposure than one in a valley; a parcel surrounded by irrigated lawn may have lower wildfire exposure than one against open space. The $19 Risk Before Buy report resolves these parcel-level differences and includes a 30-year projection for each hazard.
Heat risk in 94558
The extreme heat exposure score for 94558 is 67 (high), which is above the national median. 94558 experiences severe extreme-heat exposure. This translates directly into higher cooling costs, accelerated roof and HVAC wear, and reduced outdoor usability for parts of the year. Buyers should budget for higher-efficiency cooling and check the age of the existing HVAC system.
For a specific address inside 94558, this score can shift meaningfully. A home on a ridge may have lower flood exposure than one in a valley; a parcel surrounded by irrigated lawn may have lower wildfire exposure than one against open space. The $19 Risk Before Buy report resolves these parcel-level differences and includes a 30-year projection for each hazard.
Wildfire risk in 94558
The wildfire exposure score for 94558 is 61 (high), which is around or slightly above the national median. Wildfire risk in 94558 is moderate and usually tied to vegetated edges or WUI proximity rather than dense forest. Still, carriers in California are increasingly using parcel-level wildfire scores to price or decline coverage, so a pre-close quote is wise.
For a specific address inside 94558, this score can shift meaningfully. A home on a ridge may have lower flood exposure than one in a valley; a parcel surrounded by irrigated lawn may have lower wildfire exposure than one against open space. The $19 Risk Before Buy report resolves these parcel-level differences and includes a 30-year projection for each hazard.
Insurance is where climate risk becomes a monthly payment. In 94558, our directional estimate for a standard homeowners policy plus required hazard coverage is $2,730 – $4,937 per year. That estimate assumes a mid-range home and does not include optional coverages such as earthquake, flood (where not required), or higher wind deductibles.
Relative to local incomes, that premium range equals approximately 4.19% of the Napa County median household income — a high premium-to-income burden. As a rule of thumb, premiums above 3–4% of household income begin to compress affordability and can reduce the pool of future buyers when you eventually sell.
Buyer action items
- Get carrier quotes early. Ask at least two admitted-market carriers and one surplus-line broker for a homeowners quote that explicitly includes earthquake shaking risk, extreme heat exposure, and wildfire exposure. Do this before the inspection contingency expires.
- Add a climate contingency to the purchase agreement. Our free California-specific contract templates let you make the deal contingent on acceptable insurance premiums, flood-zone status, or seller-provided mitigation documentation.
- Order hazard-specific inspections if the top risks warrant it. In 94558, that may mean a flood-zone determination, a wildfire/defensible-space assessment, a structural/seismic review, or a wind-mitigation inspection depending on which hazards score highest.
Frequently asked questions
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Full Report
Tier L2
Address-level climate risk deep dive covering five hazards, 30-year projections, and an insurance cost estimate. Delivered as a PDF within 24 hours.
- Five-hazard score breakdown: flood, wildfire, hurricane, earthquake, heat
- 30-year federal climate projections for heat, wildfire, and sea level rise
- Insurance premium estimate range based on state DOI filings
- Clear buy / negotiate / walk-away recommendation with plain-language reasoning
- Comparable lower-risk communities within 25 miles (up to 3 when available)
- Plain-English explanations of SFHA, BFE, residual market, and other insurance terms
- Single PDF you can share with your partner, agent, or inspector
Best for: pre-offer sanity check
Delivered: PDF by email within 24 hours
Federal data: FEMA, USGS, NOAA, USDA, EPA
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Pre-Purchase Audit
Tier L3
Full due-diligence report for under-contract buyers. Adds parcel-level flood zone verification, state insurance market analysis, claim history, and a negotiation brief with specific seller-concession asks. Delivered as a PDF by email within 24 hours.
- Everything in the $19 Full Report
- Parcel-level FEMA flood zone verification (Zone A/AE/VE/X — point-in-polygon)
- State insurance market analysis: admitted carrier share, exit rate, residual market growth
- Premium Strain Index — insurance cost as % of local median income, with 2% / 5% affordability benchmarks
- 10-year NOAA Storm Events claim history for the ZIP code
- Negotiation leverage brief with specific, evidence-backed seller-concession asks (typically 3–5; fewer when data is limited)
- Total carrying cost estimate: HO-3 baseline + standalone perils + residual market fallback
- Identifies whether the property may become hard to insure before you close
- Gives you specific talking points for price, credits, and contingency negotiation
Best for: under-contract buyers
Delivered: PDF by email within 24 hours
Includes: 7-day no-questions-asked refund
Delivered by email within 24 hours of payment.
Free contract templates for California buyers
Download free climate-risk contingency addendums written for California purchase agreements. Add earthquake, extreme-heat, or wildfire contingencies to your offer.
Browse free templates