Parcel Risk Report

How do Alameda County neighborhoods rate for flood risk on FEMA's National Risk Index?

FEMA's official flood map draws the 1%-annual-chance floodplain. FEMA's National Risk Index adds a comparative flood-risk rating for every census tract — a broader, neighborhood-scale measure (it reflects expected losses and vulnerability, not just the floodplain) that complements the map rather than contradicting it.

141 of 378

census tracts in Alameda County are rated Relatively High or higher for riverine or coastal flood risk by FEMA's National Risk Index.

Census tracts in Alameda County	378
… rated Relatively High or Very High for flood (riverine or coastal)	141

These are tract-level ratings (neighborhood scale), not parcel-precise, and not a count of individual homes — see the note below. Every figure is from FEMA's National Risk Index: https://hazards.fema.gov/nri/.

Check a specific Alameda County address

County figures are a starting point. To see what the official FEMA flood map will say for one property — side by side with these cited federal & state sources — run the free per-address check:

Open the free Beyond-FEMA checker →

How this figure is derived (and what it is not)

Counts come straight from FEMA's National Risk Index census-tract layer, filtered to Alameda County (state-county FIPS 06001).
A tract is counted when its riverine or coastal flood rating is "Relatively High" or "Very High" — FEMA's own categorical ratings, never a proprietary score.
This is a tract (neighborhood) count, not a homes count. A precise "homes outside the FEMA flood zone" figure can't be derived from the free National Risk Index data, so we don't claim one.
This is general public-data information — not a Natural Hazard Disclosure Statement, and it does not satisfy California Civil Code §1103.2.

Flood risk by city in Alameda County

Tract-level flood-gap figures for each incorporated city, from the same FEMA National Risk Index data:

Alameda · Albany · Berkeley · Dublin · Emeryville · Fremont · Hayward · Livermore · Newark · Oakland · Piedmont · Pleasanton · San Leandro · Union City