Blog · October 14, 2026 · California
Using the Hillsborough Flood Zone Map
The zone on FEMA's map affects insurance, building and resale near San Mateo.
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 San Bruno, check the Hillsborough flood zone map: the zone on that map shapes insurance, permits and resale. Covered here for Hillsborough: finding the address on FEMA's map, decoding A, AE and X, and pairing it with the San Mateo County parcel viewer.
The Hillsborough flood zone map: start here
Start with FEMA's Flood Map Service Center: search an address around Foster City, and choose the dynamic map. Rural land near Millbrae with no street number is still easy to locate: zoom in from the nearest road and click inside the land.
Getting to the right map
Begin with the San Mateo County parcel viewer; it maps each assessed parcel from Foster City to San Mateo. Near Foster City, enter a street address, an owner's name or a parcel number, and the matching parcel lights up. For property near Foster City, a pop-up or side panel normally shows the owner of record, assessed acreage, a parcel ID and sometimes recent sales.
Where Hillsborough fits in
Hillsborough is part of San Mateo County, California, which means parcel data comes from the county. For property near San Bruno, City or town hall handles matters such as zoning, permits and utilities within town limits, and the county still keeps the parcel and deed records. Land beyond the city limits near Belmont generally falls under county rules, not municipal ones.
Sections, lots and bearings
California is laid out under the Public Land Survey System, which means a tract near Burlingame is described by section, township and range. A standard section is about one square mile, roughly 640 acres, and a township holds 36 of them, though sections near San Mateo can be irregular. Keep the legal description for land near Belmont for any title or survey request.
Using it on a phone
Most viewers work in a phone browser, handy when you're parked on a road near San Bruno, so load it before you lose signal. A screenshot of the parcel near Foster City with its ID keeps working without signal.
Low spots and local drainage
Small streams around Burlingame aren't always studied in detail, so look for water marks and debris lines. Wetlands near San Mateo can limit building even outside a flood zone; the National Wetlands Inventory mapper shows mapped wetlands.
What to request from a seller
Ask the listing agent for any Elevation Certificate for the house near San Bruno; an insurance quote early keeps the budget honest.
Reading A, AE and X
An AE label carries a published BFE, while plain Zone A does not; surveyors near Millbrae use that number. On ground around Belmont, a low-risk label isn't a guarantee: FEMA notes that many claims come from moderate- and low-risk areas.
The paper trail behind a parcel
Before you sign anything, request the recorded deed through the County Recorder; the parcel line is a drawing of it, and that holds around Burlingame too. For property near San Bruno, use the book and page shown in the record panel so staff can find the deed fast.
Getting answers from the right desk
If the acreage or value on a parcel near Foster City looks off are handled by the County Assessor, which maintains the tax roll. Zoning, permits and septic questions near Foster City go to planning, building or health offices, depending on whether the land is inside town limits.
Use the county map alongside FEMA
If only part of a parcel near Belmont is shaded, the structure's footprint is the key question.
Insurance, lenders and building
For land near Burlingame, get the Elevation Certificate if one exists: it compares the building to the BFE. Remodeling a house in a zone near Burlingame can trigger elevation rules; ask the local floodplain administrator before you plan.
San Mateo County in a few facts
Redwood City holds the county offices, which is where the courthouse records live. Other places on the map include Burlingame, San Mateo, Millbrae, and Belmont, each with its own cluster of lots. Around 726,353 people call San Mateo County home (Census estimate, 2023) across some 449 square miles. Features like Don Edwards San Francisco Bay National Wildlife Refuge help you orient on the aerial around San Bruno.
Questions about the Hillsborough flood zone map
Can a property in Zone X near San Mateo flood?
For most people, Zone X near Burlingame means moderate (shaded) or minimal (unshaded) mapped risk; FEMA notes that a large share of claims come from these areas.
What if the flood map is wrong for my lot near Foster City?
Generally, you can ask FEMA for a LOMA if surveyed elevations show the building near Foster City is above the BFE; it starts with an elevation survey.
Why does the BFE matter near Foster City?
For most people, a BFE near Millbrae tells builders how high the lowest floor should be; surveyors near San Mateo use it often.
When is flood insurance required around San Bruno?
Short answer: for a building near Burlingame in an A or V zone with a federally backed or regulated mortgage, it's generally required, in communities that take part in the NFIP.
How do I save a parcel from the viewer near Belmont?
Use the print button or a screenshot; include the record panel for the lot near Millbrae.
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.