Ventura County, CA: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Ventura County scores at the 99.3th percentile for flood hazard, rated "Very High" — among the highest flood hazard in the country. The hazard here is driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.9 times a year. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Ventura County's flood-insurance compliance gap
Homes with a federally backed mortgage inside Ventura County's mapped high-risk flood zone (the Special Flood Hazard Area, or SFHA) are legally required to carry an NFIP flood policy. In practice, 30.9% of them do — 2,264 active policies against 7,333 structures FEMA counts in that zone, leaving a real compliance gap. Looking beyond the mandated zone, 1.6% of all residential structures in Ventura County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Ventura County ranks
Among the 3144 US counties FEMA scores for flood hazard, Ventura County ranks 27 — 1 being the highest hazard nationally — and 77 by population among all 3144 counties covered here, where 1 is the largest. About 835,427 people live in Ventura County, California, spread over 1,840.78 square miles.
Your street may differ from Ventura County's average
FEMA counts 230,123 residential structures in Ventura County overall, 3,771 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
Where Ventura County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.