Blog · October 14, 2026 · California
San Bruno Flood Zone Map: checking a property's flood zone
Flood zones are set by FEMA, and checking one near Millbrae 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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Before an offer near Colma, look at the San Bruno flood zone map: a mapped flood zone changes insurance, permits and resale. This San Bruno guide covers: locating a parcel on FEMA's map, decoding A, AE and X, and matching it with the county parcel viewer.
Checking the San Bruno flood zone map step by step
The official source is FEMA's Flood Map Service Center: search an address around Pacifica, and pick the FIRMette or map view. Rural land near Burlingame with no street number is still easy to locate: search the nearest road then click the parcel area.
Where the parcel data lives
Go first to the San Mateo County parcel viewer; it covers every assessed parcel in the county, Colma included. With a lot near Brisbane, enter a street address, an owner's name or a parcel number, then pick the result to center the map on it. If the land is near Colma, a pop-up or side panel normally shows the owner of record, assessed acreage, a parcel ID and sometimes recent sales.
Water near Pacifica
Small streams around Colma aren't always studied in detail, so look for water marks and debris lines. Marshy spots near Brisbane can limit building too; check the National Wetlands Inventory mapper for a first look.
Where San Bruno fits in
San Bruno lies within San Mateo County, California, and the county assessor maps its lots. Near South San Francisco, the municipality handles things like zoning, permits and utilities for lots inside the boundary, and the county still keeps the parcel and deed records. Acreage past the city limits out by Colma generally falls under county rules instead.
Backing up the map with records
When the details count, request the recorded deed through the County Recorder; the parcel map near Colma only summarizes it. Long-held tracts near Burlingame can go back through a long string of deeds, and a title company can sort it out on a real sale.
A word on accuracy
The acreage figure is an estimate; just a licensed surveyor establishes the real corners on land around Colma. For acreage around Millbrae, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Next door to San Mateo County
San Mateo County touches Alameda County, San Francisco County, Santa Clara County, and Santa Cruz County; every one of them runs a separate parcel map. Ground near Brisbane that runs to the line may show up in two county records, so check the neighboring map too. On ground around Colma, our state page links each neighboring county map across California.
What the zone letters mean
If you're looking near Colma, any A or V zone are Special Flood Hazard Areas, land with a 1-percent chance of flooding in any year. For a tract near Brisbane, a low-risk label isn't a guarantee: according to FEMA, floods happen outside mapped zones too.
A quick look at the area
Redwood City serves as the county seat, which is where the courthouse records live. Smaller places on the map include Millbrae, Pacifica, South San Francisco, and Colma, where town lots give way to larger tracts. About 726,353 people live in San Mateo County (Census Bureau estimate, 2023) on roughly 449 square miles. Landmarks such as Don Edwards San Francisco Bay National Wildlife Refuge help you orient on the aerial around South San Francisco.
Field tips
The parcel map usually runs in a mobile browser, which helps when you're standing on land near South San Francisco, so load it before you lose signal. A saved image of the lot near Burlingame and its lines keeps working without signal.
Lining it up with the parcel map
Where a floodplain cuts across acreage near Burlingame, the structure's footprint is the key question.
What a flood zone means for a buyer
Out toward Brisbane, an Elevation Certificate from a surveyor helps: it can change the insurance price a lot. Building or adding on near Pacifica in a mapped zone can trigger elevation rules; check with the county or town building office before you plan.
What to request from a seller
Ask the listing agent whether the home has flooded on the property near Pacifica; an insurance quote early avoids surprises.
San Bruno: common questions
Is there a flood layer on the parcel viewer near South San Francisco?
For most people, the parcel map near Pacifica might show FEMA zones; confirm a lot near Millbrae on FEMA's map either way.
Is AE a high-risk flood zone in San Bruno?
In most cases, AE is a Special Flood Hazard Area with a published base flood elevation, which shapes building rules near Brisbane.
What is a LOMA near Colma?
Short answer: FEMA's LOMA process is the usual route when a building near Burlingame sits above the base flood elevation; it starts with an elevation survey.
How can I tell if a house near Burlingame is in a flood zone?
In most cases, search the address near Millbrae on FEMA's Flood Map Service Center, which takes a couple of minutes.
How is land described in California deeds near Colma?
For a home near Burlingame, deeds use lot and block, metes and bounds or survey descriptions; copy it for any survey or title request.
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.