How much flood risk does San Augustine County actually carry?
San Augustine County lands at the 17th percentile of FEMA's National Risk Index for flooding, "Very Low" territory — among the lowest flood hazard in the country — 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 2 years. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Mandatory flood insurance compliance in San Augustine County
San Augustine 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 San Augustine County, not just the ones FEMA mandates, 0.9% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where San Augustine County ranks
San Augustine County sits at rank 2646 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 2594 of 3144 by population (1 is biggest). San Augustine County, Texas is home to about 7,767 people across 530.659 square miles of land.
Your street may differ from San Augustine County's average
29 of San Augustine County's 3,195 residential structures carry flood coverage of some kind, per FEMA's latest count — useful context, not a substitute for checking one parcel.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed San Augustine County's numbers. See the data quality guide for why San Augustine County, like hundreds of other counties, doesn't get a clean compliance percentage.