Hudson Riverfront FEMA Compliance: How It Differs from Sound Shore

Westchester has two distinct shoreline flood regimes — the tidal Hudson and the coastal Long Island Sound — and the differences materially affect FEMA compliance, NFIP Risk Rating 2.0 pricing, and the 50% substantial improvement rule on renovations. This guide explains what's different on the Hudson side, what FEMA zone designations mean for Rivertown properties, and the hardening upgrades that consistently move insurance premiums.