How much flood risk does Shasta County actually carry?
Shasta County lands at the 94.8th percentile of FEMA's National Risk Index for flooding, "Relatively High" territory — well above 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 1 times a year. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Shasta County's flood-insurance compliance gap
Out of 2,056 homes FEMA counts inside Shasta County's mapped flood zone, 393 carry the flood policy federal law requires there — 19.1% compliance, short of full coverage. Across all residential structures in Shasta County, not just the ones FEMA mandates, 0.8% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
Where Shasta County ranks
Shasta County sits at rank 179 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 384 of 3144 by population (1 is biggest). About 181,121 people live in Shasta County, California, spread over 3,775.651 square miles.
Your street may differ from Shasta County's average
551 of Shasta County's 68,762 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 Shasta County's numbers. The guide to what the Special Flood Hazard Area actually means explains why the mandatory-insurance rule exists and who it applies to.