Blog · October 14, 2026 · California
Danville Flood Zone Map: checking a property's flood zone
The zone on FEMA's map affects insurance, building and resale near San Ramon.
Main page: Contra Costa County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Before an offer near Concord, look at the Danville flood zone map: FEMA's zone label affects insurance, permits and resale. This Danville guide covers: locating a parcel on FEMA's map, decoding A, AE and X, and pairing it with the Contra Costa County parcel viewer.
Getting started with the Danville flood zone map
Flood zones come from FEMA's Flood Map Service Center: type an address near Moraga, and choose the dynamic map. A tract near Moraga without an address is still easy to locate: zoom in from Interstate 580 and click the spot.
The free map to start with
Go first to the Contra Costa County parcel viewer; it maps every assessed parcel around Moraga and Clayton. If you only know roughly where the land is, zoom in from Clayton and click the parcel itself. For a parcel near Walnut Creek, write down the parcel ID from that panel; each clerk in the county asks for it first.
Field tips
The parcel map usually runs in a mobile browser, useful out on a road near Moraga, though signal can drop in rural spots. A printout of the tract near San Ramon keeps working without signal.
Limits of the parcel data
Listed acreage is a tax-roll number; just a licensed surveyor establishes the real boundary for a parcel near Walnut Creek. Out toward Walnut Creek, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Beyond the mapped zones
Small streams around Concord aren't always studied in detail, so look for water marks and debris lines. Wetlands near Moraga can limit building even outside a flood zone; the National Wetlands Inventory mapper shows mapped wetlands.
A quick look at the area
Martinez serves as the county seat, home to the main records offices. Other places on the map include San Ramon, Walnut Creek, Moraga, and Clayton. Around 1,155,025 people live in Contra Costa County (Census estimate, 2023) on roughly 717 square miles. Landmarks such as Clayton-Marsh Creek-Greenville Fault, San Pablo Dam Reservoir, and Mount Diablo State Park help you orient on the aerial around San Ramon.
Danville and the county around it
Danville lies within Contra Costa County, California, so its parcels are on the county's map. For a tract near Lafayette, city or town hall handles things like zoning, permits and utilities within town limits, but the county runs assessment and recording. Acreage past the city limits near Clayton usually answers to county rules instead.
A short flood checklist
Request whether the home has flooded on the property near Moraga; getting a quote early avoids surprises.
Where the recorded documents are
The map is an index, not the title: recorded deeds, subdivision plats and easements for land near Walnut Creek sit with the County Recorder. Long-held tracts near Walnut Creek can sit on a long string of deeds, and a title company can sort it out on a real sale.
How land is described here
California is laid out under the Public Land Survey System, so deeds around San Ramon reference sections and townships. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though sections near San Ramon can be irregular. Keep the legal description for land near San Ramon for any title or survey request.
Who handles what
Anything recorded against property around Moraga come from the County Recorder, usually searchable by name or document number. Zoning, permits and septic questions near San Ramon need the planning or permitting office, and the answer depends on jurisdiction.
Decoding the flood zone labels
On ground around Lafayette, 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 Clayton, minimal risk is not no risk: according to FEMA, floods happen outside mapped zones too.
Matching the zone to the lot lines
FEMA doesn't draw property lines, so open the Contra Costa County parcel viewer next for the outline of the tract near San Ramon.
What a flood zone means for a buyer
On ground around Concord, get the Elevation Certificate if one exists: it can change the insurance price a lot. Building or adding on near Walnut Creek in a mapped zone can trigger elevation rules; call the permitting office early.
Danville: common questions
How often are flood maps updated around Walnut Creek?
In most cases, zones near Moraga can shift when FEMA updates a panel; your community is notified before changes take effect.
What is a LOMA near Moraga?
You can ask FEMA for a LOMA if surveyed elevations show the building near San Ramon is above the BFE; it starts with an elevation survey.
What is a base flood elevation in Danville?
Short answer: a BFE near Moraga tells builders how high the lowest floor should be; local rules may require building above it.
Does the county parcel map show flood zones around Lafayette?
Short answer: the parcel map near Concord might show FEMA zones; confirm a lot near Walnut Creek on FEMA's map either way.
What's the tax parcel number used for near Lafayette?
The parcel ID identifies one tax parcel near San Ramon, and it's on the record panel and tax bills.
Open the official Contra Costa 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.