Whatcom County, WA Flood Zone & Flood Risk Data
Whatcom County, WA: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Whatcom County scores at the 88.9th percentile for flood hazard, rated "Relatively Moderate", a middling flood hazard by national standards. 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 once every 6 years. This describes the county, not any one street, FEMA only publishes exact parcel zones through a live map service.
Who actually carries the flood insurance FEMA requires
29.1% of the homes FEMA requires to carry flood insurance in Whatcom County, those inside the mapped Special Flood Hazard Area, actually have a policy in force: 1,169 policies against 4,011 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Looking beyond the mandated zone, 1.9% of all residential structures in Whatcom County carry flood coverage voluntarily or otherwise, relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Whatcom County ranks
Among the 3144 US counties FEMA scores for flood hazard, Whatcom County ranks 366, 1 being the highest hazard nationally, and 306 by population among all 3144 counties covered here, where 1 is the largest. About 234,954 people live in Whatcom County, Washington, spread over 2,107.928 square miles.
Checking a specific address in Whatcom County
1,497 of Whatcom County's 79,381 residential structures carry flood coverage of some kind, per FEMA's latest count, useful context, not a substitute for checking one parcel.
Where Whatcom 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.