Type an address, see its zone on FEMA's current flood map — and what that actually means here.
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Most of Westminster drains to the East Garden Grove–Wintersburg Channel, and the county's own engineers say that system can't contain the biggest storms. This checker reads FEMA's current flood map for any address in or around the city and explains, in plain words, what the zone means. We don't save the address you type.
The East Garden Grove–Wintersburg Channel drains the 74-square-mile watershed Westminster sits in. OC Public Works states plainly that this drainage system "does not have the capacity to contain the 100-year flood because the channel banks and levees are overtopped at several locations." That is why so much of the city is mapped in the shaded 0.2% ("500-year") zone rather than outside the hazard area entirely.
Orange County and the US Army Corps of Engineers have been studying improvements to the Westminster watershed since 2001. The county notes that over 20,000 property owners in the watershed must participate in the National Flood Insurance Program because of local flood risks. The feasibility-study page is the place to watch for project news.
Inside a high-risk zone, flood insurance is required when the mortgage is federally backed; everywhere else it is optional but available through the National Flood Insurance Program. FloodSmart.gov is the official place to start.
Zone results come live from FEMA’s National Flood Hazard Layer (the current effective flood map), with addresses located by the US Census Bureau’s public geocoder. Maps get revised; the official record is always the .