How much flood risk does Tripp County actually carry?
Tripp County lands at the 37.1th percentile of FEMA's National Risk Index for flooding, "Relatively Low" territory — below the national norm for flood hazard — with the hazard driven by inland rivers and flash flooding rather than the coast — FEMA's model puts a flood event here at about once every 1 years. County-wide, not parcel-specific: FEMA's real flood-zone map is queried live, never shipped as a download.
Mandatory flood insurance compliance in Tripp County
Tripp County is one of the counties where FEMA's own denominator for mandated flood-zone structures is missing, so no compliance rate is shown rather than a guessed one — the data quality guide covers how common this is. Across all residential structures in Tripp County, not just the ones FEMA mandates, 0% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Tripp County ranks
Tripp County sits at rank 2044 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2760 of 3144 by population (1 is biggest). Tripp County, South Dakota is home to about 5,717 people across 1,612.289 square miles of land.
What to do next if you own or are buying in Tripp County
Across all of Tripp County's 5,469 residential structures, 1 carry an NFIP policy today — a county-wide count that still can't tell you one address's own mapped zone.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Tripp County's numbers. See the data quality guide for why Tripp County, like hundreds of other counties, doesn't get a clean compliance percentage.