Ascension Parish, LA flood risk explained
Flood hazard in Ascension Parish sits at the 79.2th national percentile, a middling flood hazard by national standards; split between inland river flooding (about once every 1 years) and coastal storm surge (about 3.8 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 Ascension Parish
45.4% of the homes FEMA requires to carry flood insurance in Ascension Parish — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 6,990 policies against 15,398 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Looking beyond the mandated zone, 28.9% of all residential structures in Ascension Parish carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Ascension Parish compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Ascension Parish ranks 684 — 1 being the highest hazard nationally — and 494 by population among all 3144 counties covered here, where 1 is the largest. Ascension Parish, Louisiana is home to about 133,534 people across 290.003 square miles of land.
Checking a specific address in Ascension Parish
13,203 of Ascension Parish's 45,717 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Ascension Parish's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Ascension Parish's coastal exposure is covered in the coastal vs. inland flood risk guide, including how storm surge risk differs from river flooding.