Blog · October 14, 2026 · California
Millbrae Flood Zone Map: checking a property's flood zone
Flood zones are set by FEMA, and checking one near Pacifica takes a few minutes.
Main page: San Mateo County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Ahead of any purchase around South San Francisco, pull up the Millbrae flood zone map: the zone on that map shapes insurance, permits and resale. What this Millbrae guide covers: the free FEMA tools, what each zone label means, when insurance is required and how to challenge a map that looks wrong.
Checking the Millbrae flood zone map step by step
Flood zones come from FEMA's Flood Map Service Center: type an address near San Bruno, and pick the FIRMette or map view. A tract near Brisbane without an address can still be found: zoom in from the nearest road then click the parcel area.
Where the parcel data lives
Go first to the San Mateo County parcel viewer; it covers each assessed parcel around Pacifica and Brisbane. For property near Hillsborough, enter a street address, an owner's name or a parcel number, and the viewer zooms to the match. If the land is near South San Francisco, write down the parcel ID while you have it open; every office in the county will want it.
Millbrae and the county around it
Millbrae sits in San Mateo County, California, which means parcel data comes from the county. Around Brisbane, City or town hall handles matters such as zoning, permits and utilities inside its limits, while the county keeps the tax map. Lots just outside the town limits toward Burlingame often falls under county rules rather than the town's.
Sections, lots and bearings
California uses the Public Land Survey System, which means a tract near Brisbane is described by section, township and range. Each section is nominally a mile square, about 640 acres, with 36 sections to a township, though corrections make some sections near San Bruno odd-sized. Keep the legal description for land near Pacifica for any title or survey request.
Using it on a phone
The parcel map usually runs in a mobile browser, useful out on a road near South San Francisco, so load it before you lose signal. A screenshot of the parcel near San Bruno with its ID is a good backup.
Getting your bearings
Redwood City serves as the county seat, home to the main records offices. You'll also find Burlingame, San Bruno, Hillsborough, and South San Francisco, where town lots give way to larger tracts. About 726,353 people call San Mateo County home (Census estimate, 2023) on roughly 449 square miles. Features like Don Edwards San Francisco Bay National Wildlife Refuge help you orient on the aerial around Brisbane.
A short flood checklist
Request whether the home has flooded for the house near Brisbane; an insurance quote early keeps the budget honest.
Deeds, plats and who keeps them
The map is an index, not the title: deeds, plats and easements for land near Pacifica are filed with the County Recorder. Long-held tracts near South San Francisco can go back through several deeds, and a title company earns its fee on a real sale.
What the zone letters mean
An AE label comes with a base flood elevation, while plain Zone A does not; that elevation drives building rules near Pacifica. For land near Hillsborough, a low-risk label isn't a guarantee: FEMA notes that floods happen outside mapped zones too.
Lining it up with the parcel map
FEMA's map shows zones but not ownership, so check the San Mateo County parcel viewer too for the outline of the tract near Pacifica.
Insurance, lenders and building
Out toward Pacifica, an Elevation Certificate from a surveyor helps: it compares the building to the BFE. Remodeling a house in a zone near Hillsborough usually means extra permit review; call the permitting office before you plan.
Neighboring parcel maps
San Mateo County borders Alameda County, San Francisco County, Santa Clara County, and Santa Cruz County, and each of those keeps its own parcel map. Ground near Hillsborough that runs to the line may show up in two county records, so open the adjacent map as well. With a lot near South San Francisco, our state page links each neighboring county map across California.
Water near Burlingame
Creeks and ditches near Brisbane may not have detailed mapping, so walk the land after rain. Marshy spots near Burlingame can limit building too; the National Wetlands Inventory mapper shows mapped wetlands.
Frequently asked
Is AE a high-risk flood zone around Pacifica?
In most cases, both are high-risk zones, but only AE has a base flood elevation, which shapes building rules near Pacifica.
How often are flood maps updated around Brisbane?
Good question; zones near Brisbane can shift when FEMA updates a panel; your community is notified before changes take effect.
Will my lender require flood insurance near South San Francisco?
In most cases, lenders generally require it for buildings near Hillsborough in a Special Flood Hazard Area when the loan is federally regulated or insured, in communities that take part in the NFIP.
What is a LOMA near Brisbane?
For most people, you can ask FEMA for a LOMA if surveyed elevations show the building near Burlingame is above the BFE, and lenders accept the result.
How do I save a parcel from the viewer in Millbrae?
Some viewers offer PDF export; include the record panel for the lot near Brisbane.
Open the official San Mateo County, CA parcel map See it in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.