How much flood risk does Cowlitz County actually carry?
Cowlitz County lands at the 88.3th percentile of FEMA's National Risk Index for flooding, "Relatively Moderate" territory — a middling flood hazard by national standards — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 1 years. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Mandatory flood insurance compliance in Cowlitz County
30.8% of the homes FEMA requires to carry flood insurance in Cowlitz County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 529 policies against 1,716 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Cowlitz County, not just the ones FEMA mandates, 2% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Cowlitz County against the rest of the country
Cowlitz County sits at rank 385 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 559 of 3144 by population (1 is biggest). Cowlitz County, Washington covers 1,141.176 square miles and counts roughly 113,982 residents.
What to do next if you own or are buying in Cowlitz County
Across all of Cowlitz County's 42,703 residential structures, 839 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Cowlitz County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.