Ziebach County, SD flood risk explained
Flood hazard in Ziebach County sits at the 8.9th national percentile, among the lowest flood hazard in the country; driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about 1.2 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 Ziebach County
FEMA hasn't published a residential structure count for Ziebach County's mapped flood zone, so a reliable mandatory-compliance percentage can't be computed here — see the data quality guide for why this gap exists for roughly a quarter of US counties. Looking beyond the mandated zone, 0.2% of all residential structures in Ziebach County carry flood coverage voluntarily or otherwise — relevant because most NFIP claims nationally come from outside the mapped SFHA.
Ziebach County against the rest of the country
Among the 3144 US counties FEMA scores for flood hazard, Ziebach County ranks 2880 — 1 being the highest hazard nationally — and 3004 by population among all 3144 counties covered here, where 1 is the largest. Ziebach County, South Dakota covers 1,961.248 square miles and counts roughly 2,418 residents.
Checking a specific address in Ziebach County
Across all of Ziebach County's 830 residential structures, 2 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
Where Ziebach County's figures come from
Every figure on this page traces to a named FEMA dataset, documented in the methodology guide. Ziebach 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.