Northwest Arctic Borough, AK flood risk explained
Flood hazard in Northwest Arctic Borough sits at the 3.4th national percentile, not rated by FEMA’s risk index; split between inland river flooding (about once every 100 years) and coastal storm surge (about once every Infinity years). County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Northwest Arctic Borough's flood-insurance compliance gap
FEMA hasn't published a residential structure count for Northwest Arctic Borough'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, 1.5% of all residential structures in Northwest Arctic Borough carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Where Northwest Arctic Borough ranks
Among the 3144 US counties FEMA scores for flood hazard, Northwest Arctic Borough ranks 3042 — 1 being the highest hazard nationally — and 2645 by population among all 3144 counties covered here, where 1 is the largest. Northwest Arctic Borough, Alaska covers 35,671.697 square miles and counts roughly 7,134 residents.
Checking a specific address in Northwest Arctic Borough
Across all of Northwest Arctic Borough's 1,510 residential structures, 22 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Northwest Arctic Borough's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Northwest Arctic Borough'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.