Parcel Risk Report
Flood risk in and around Williams, Colusa County
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. Here's how the tracts in and around Williams rate, and how to check one address.
0 of 2
census tracts in and around Williams are rated Relatively High or Very High for riverine or coastal flood risk by FEMA's National Risk Index.
| Census tracts intersecting Williams | 2 |
| … rated Relatively High or Very High for flood (riverine or coastal) | 0 |
FEMA's National Risk Index does not rate the tracts in and around Williams among the higher flood-risk neighborhoods. That is not a determination of zero risk — the National Risk Index is a comparative neighborhood rating, and the official FEMA flood map can still place an individual property in a flood zone. These are tract-level ratings (neighborhood scale), not parcel-precise and not a count of homes.
Check a specific Williams address
City figures are a starting point. To see what the official FEMA flood map will say for one property in Williams — side by side with these cited federal & state sources — run the free per-address check:
Open the free Beyond-FEMA checker → · See all of Colusa County →
How this figure is derived (and what it is not)
- Counts come from FEMA's National Risk Index census-tract layer, limited to the tracts that intersect the U.S. Census Bureau 2020 boundary of Williams (Colusa County, state-county FIPS 06011).
- A tract is counted when its riverine or coastal flood rating is "Relatively High" or "Very High" — FEMA's own comparative categorical classes, never a proprietary score, never a per-parcel prediction.
- We say "in and around Williams" on purpose: census tracts don't line up with city limits, so a tract is included if it touches the boundary — and for a small city, many counted tracts may extend well beyond its limits. Read the figure as the surrounding neighborhood, not the city alone. It is a tract count, not a homes count, and not parcel-precise.
- Ratings: FEMA National Risk Index (https://hazards.fema.gov/nri/). City boundary: U.S. Census 2020 incorporated places (census.gov). Both update rarely; data retrieved 2026-06-02.
- This is general public-data information — not a Natural Hazard Disclosure Statement, and it does not satisfy California Civil Code §1103.2 (the seller's statutory disclosure in a sale).
Other cities in Colusa County
Colusa