Rensselaer County, NY flood risk explained
Flood hazard in Rensselaer County sits at the 89th national percentile, a middling flood hazard by national standards; driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 2.3 times a year. This describes the county, not any one street — FEMA only publishes exact parcel zones through a live map service.
Rensselaer County's flood-insurance compliance gap
FEMA's own figures for Rensselaer County report more NFIP policies in the mapped flood zone than FEMA's own count of residential structures there, which produces a compliance rate over 100% — a data problem on FEMA's side, not evidence that everyone here is over-insured. See the data quality guide for how widespread this is. Looking beyond the mandated zone, 1.1% of all residential structures in Rensselaer County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
How Rensselaer County compares nationally
Among the 3144 US counties FEMA scores for flood hazard, Rensselaer County ranks 363 — 1 being the highest hazard nationally — and 434 by population among all 3144 counties covered here, where 1 is the largest. About 160,749 people live in Rensselaer County, New York, spread over 652.459 square miles.
Your street may differ from Rensselaer County's average
571 of Rensselaer County's 50,955 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
Where Rensselaer County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Rensselaer 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.