Humboldt County, CA flood risk explained
Flood hazard in Humboldt County sits at the 94.2th national percentile, well above the national norm for flood hazard; split between inland river flooding (about once every 1 years) and coastal storm surge (about 3.6 times a year). County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Mandatory flood insurance compliance in Humboldt County
9.8% of the homes FEMA requires to carry flood insurance in Humboldt County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 249 policies against 2,542 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Looking beyond the mandated zone, 0.7% of all residential structures in Humboldt County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Humboldt County against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, Humboldt County ranks 200 — 1 being the highest hazard nationally — and 499 by population among all 3144 counties covered here, where 1 is the largest. About 132,380 people live in Humboldt County, California, spread over 3,568.025 square miles.
Checking a specific address in Humboldt County
Across all of Humboldt County's 50,415 residential structures, 342 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Humboldt County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Humboldt County's coastal exposure is covered in the coastal vs. inland flood risk guide, including how storm surge risk differs from river flooding.