Flood zone · Iowa
Flood zone in Iowa
Flood zone (FEMA NFHL) data for ZIP codes in Iowa. Pick a ZIP below to dive into the flood zone summary.
Last verified 2026-09-24 · methodology
What lands here
Not on zipradar yet. The plan is the FEMA flood zone code, what it means in plain English, and the base flood elevation where assigned. Until then, look the address up on FEMA's Flood Map Service Center.
Source & refresh
FEMA NFHL. Refreshed quarterly loma updates. Primary source →
Iowa top concern
Radon Zone 1, agricultural water nitrates
Iowa is one of the highest-radon states in the US — uniformly Zone 1. Agricultural runoff drives EPA SDWIS nitrate violations in small rural systems and even Des Moines Water Works. Tornadoes peak April-June.
See Iowa state page for the full state-level rollup across all 12 dimensions.
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