Is Solano County, CA in a flood zone?
FEMA's National Risk Index puts Solano County's flood hazard at the 97.4th percentile nationally — well above 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 1 years. That's a county-wide figure, not a per-address one — FEMA's parcel maps are a live lookup, not a bulk file.
Solano County's flood-insurance compliance gap
25.3% of the homes FEMA requires to carry flood insurance in Solano County — those inside the mapped Special Flood Hazard Area — actually have a policy in force: 1,319 policies against 5,211 mandated structures, which means a meaningful share of legally-required coverage simply isn't there. Across all residential structures in Solano County, not just the ones FEMA mandates, 1.3% carry an NFIP policy — most flood damage nationally happens outside the mapped high-risk zone, so that broader number matters too.
How Solano County compares nationally
Solano County sits at rank 94 of 3144 counties on FEMA's flood hazard scale (1 is worst) and rank 162 of 3144 by population (1 is biggest). Solano County, California is home to about 455,101 people across 821.738 square miles of land.
Your street may differ from Solano County's average
FEMA counts 133,171 residential structures in Solano County overall, 1,696 of them carrying some form of NFIP coverage — but a lender or insurer cares about one parcel, not that county total.
More on how this number was built
The methodology guide shows exactly which FEMA and Census tables feed Solano 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.