Sanilac County, MI flood risk explained
Flood hazard in Sanilac County sits at the 66.2th national percentile, below the national norm for flood hazard; driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 3 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Who actually carries the flood insurance FEMA requires
Out of 151 homes FEMA counts inside Sanilac County's mapped flood zone, 19 carry the flood policy federal law requires there — 12.6% compliance, short of full coverage. Looking beyond the mandated zone, 0.2% of all residential structures in Sanilac County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Sanilac County against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, Sanilac County ranks 1110 — 1 being the highest hazard nationally — and 1184 by population among all 3144 counties covered here, where 1 is the largest. About 40,293 people live in Sanilac County, Michigan, spread over 962.571 square miles.
Your street may differ from Sanilac County's average
Across all of Sanilac County's 19,748 residential structures, 29 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Sanilac County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. If you're unsure why any of this insurance requirement exists at all, the SFHA explainer covers it from first principles.