Blog · October 14, 2026 · California
San Rafael Flood Zone Map: checking a property's flood zone
The zone on FEMA's map affects insurance, building and resale near Tiburon.
Main page: Marin County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
Platbookmapper is an Amazon Associate. If you buy through an Amazon link on this page, we earn a commission. The link is a product, not the county map.
Before an offer near Mill Valley, pull up the San Rafael flood zone map: FEMA's zone label affects insurance, permits and resale. Covered here for San Rafael: the free FEMA tools, what each zone label means, lender insurance rules and what a LOMA is.
Checking the San Rafael flood zone map step by step
Start with FEMA's Flood Map Service Center: search an address around San Anselmo, and choose the dynamic map. A tract near Tiburon without an address can still be found: zoom in from US Route 101 and click the spot.
The viewer Marin County publishes
Go first to the Marin County parcel viewer; it covers each tax parcel around Tiburon and Mill Valley. Without an address in hand, pan along US Route 101 and click the parcel itself. For acreage around Tiburon, a pop-up or side panel normally shows the owner of record, assessed acreage, the parcel number and in many cases the last transfer.
Land on the county line
Marin County borders Contra Costa County, San Francisco County, Solano County, and Sonoma County; every one of them runs a separate parcel map. Acreage along the edge near Mill Valley may show up across two assessors' files, so open the neighboring map too. If you're looking near San Anselmo, the Platbookmapper state page lists every bordering county map for California.
Before you lean on the lines
Acreage on the record is an assessed number; only a licensed surveyor sets the real boundary on land around Corte Madera. For a tract near Ross, owner names and values update on a schedule, so a deed recorded last month might lag behind.
A short flood checklist
Request about past flood claims for the house near Tiburon; getting a quote early keeps the budget honest.
City limits and county records
San Rafael sits in Marin County, California, and the county assessor maps its lots. As the county seat, San Rafael hosts the courthouse, handy when you need recorded documents. On ground around Mill Valley, city or town hall handles things like zoning, permits and utilities within town limits, but the county runs assessment and recording. Land beyond the city limits toward San Anselmo generally follows county rules rather than the town's.
How land is described here
California follows the Public Land Survey System, so rural legal descriptions near San Anselmo cite section, township and range. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though sections near Corte Madera can be irregular. Write down the legal description for the tract near Tiburon when you talk to a surveyor.
Getting answers from the right desk
If the acreage or value on a parcel near Corte Madera looks off belong with the County Assessor, the office behind the parcel record. Questions about what you can build around Ross go to planning, building or health offices, depending on whether the land is inside town limits.
Reading A, AE and X
Zone AE carries a published BFE, which plain A zones lack; surveyors near Ross use that number. On ground around San Anselmo, shaded Zone X marks moderate flood hazard, between the 1% and 0.2% annual chance floods; unshaded X is minimal risk.
Water near Ross
Creeks and ditches near Tiburon aren't always studied in detail, so ask neighbors about past flooding. Wet ground around San Anselmo is a separate issue from flood zones; the National Wetlands Inventory mapper shows mapped wetlands.
Marin County in a few facts
San Rafael serves as the county seat, home to the main records offices. Other places on the map include Larkspur, Ross, Corte Madera, and San Anselmo, each with its own cluster of lots. Roughly 254,407 people call Marin County home (Census Bureau estimate, 2023) spread over about 520 square miles. Landmarks such as San Pablo Bay, San Francisco Bay, and Golden Gate National Recreation Area help you orient on the aerial around Larkspur.
Parcel lines plus flood zones
FEMA doesn't draw property lines, so pair it with the Marin County parcel viewer for the outline of the tract near Mill Valley.
Insurance, lenders and building
For a home near Tiburon, get the Elevation Certificate if one exists: it can change the insurance price a lot. Remodeling a house in a zone near Ross usually means extra permit review; ask the local floodplain administrator before you plan.
Quick answers
Where can I see the San Rafael flood zone map for free?
In most cases, look up the spot near Larkspur in FEMA's National Flood Hazard Layer viewer; then confirm the parcel on the county viewer.
Does the county parcel map show flood zones for land near Larkspur?
A flood layer may appear in the Marin County parcel viewer layer list; confirm a lot near Ross on FEMA's map either way.
Do I need to worry about flooding in Zone X around Corte Madera?
For most people, X zones around Corte Madera are lower risk, not no risk; many owners near Tiburon buy coverage anyway.
Is flood insurance mandatory near Ross?
Generally, for a building near Mill Valley in an A or V zone with a federally backed or regulated mortgage, it's generally required; elsewhere it's optional.
Does the parcel map work on a phone around Mill Valley?
No app is needed for most county viewers; load it before you lose coverage near Ross.
Open the official Marin 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.