Chelan County, WA: flood risk, in FEMA's own numbers
On FEMA's National Risk Index, Chelan County scores at the 91.3th 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 1.5 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 Chelan County
FEMA hasn't published a residential structure count for Chelan County's mapped flood zone, so a reliable mandatory-compliance percentage can't be computed here — see the data quality guide for why this gap exists for roughly a quarter of US counties. Looking beyond the mandated zone, 1.2% of all residential structures in Chelan County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Chelan County ranks
Among the 3144 US counties FEMA scores for flood hazard, Chelan County ranks 294 — 1 being the highest hazard nationally — and 718 by population among all 3144 counties covered here, where 1 is the largest. About 81,228 people live in Chelan County, Washington, spread over 2,921.178 square miles.
Checking a specific address in Chelan County
FEMA counts 38,443 residential structures in Chelan County overall, 469 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
Where Chelan County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Chelan County's compliance figure is one of the ones affected by FEMA's incomplete denominator data — the data quality guide explains what that means and how many counties it touches.