Blog · October 14, 2026 · California
Using the Oakley Flood Zone Map
Flood zones are set by FEMA, and checking one near Antioch takes a few minutes.
Main page: Contra Costa County, CA GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Ahead of any purchase around Antioch, pull up the Oakley flood zone map: FEMA's zone label affects insurance, permits and resale. In this Oakley guide: locating a parcel on FEMA's map, reading the zone codes, and confirming the outline on the county map.
Where the Oakley flood zone map lives
The official source is FEMA's Flood Map Service Center: type an address near Brentwood, then open the map view for that panel. Rural land near Danville with no street number is still easy to locate: pan from the closest town and click inside the land.
The free map to start with
Begin with the Contra Costa County parcel viewer; it covers every tax parcel in the county, Pittsburg included. Near Concord, put in a street address, an owner's name or a parcel number, then pick the result to center the map on it. If you're looking near Brentwood, write down the parcel ID while you have it open; each records desk in the county will want it.
Oakley, CA: the basics
Oakley lies within Contra Costa County, California, so its parcels are on the county's map. Near Brentwood, the municipality handles things like zoning, permits and utilities within town limits, but the county runs assessment and recording. Lots just outside the town limits toward Brentwood usually answers to county rules, not municipal ones.
Water near Antioch
Small streams around Pittsburg may not have detailed mapping, so walk the land after rain. Wet ground around Brentwood is a separate issue from flood zones; the National Wetlands Inventory mapper shows mapped wetlands.
Getting answers from the right desk
Questions about value or the owner field for land near Brentwood belong with the County Assessor, the office behind the parcel record. Questions about what you can build around Brentwood go to planning, building or health offices, town or county, depending on location.
What the zone letters mean
For property near Clayton, any A or V zone are Special Flood Hazard Areas, land with a 1-percent chance of flooding in any year. Closer to Brentwood, a shaded X area is moderate risk, roughly the 100- to 500-year range; unshaded X is minimal risk.
Places you'll see on the map
Martinez is the county seat, where most land records are kept. Other places on the map include Brentwood, Antioch, Pittsburg, and Clayton. Around 1,155,025 people live in Contra Costa County (Census estimate, 2023) on some 717 square miles. Places such as Clayton-Marsh Creek-Greenville Fault, San Pablo Dam Reservoir, and Mount Diablo State Park make handy reference points on the map near Concord.
Limits of the parcel data
Acreage on the record is a tax-roll number; just a licensed surveyor sets the real corners on land around Antioch. If the land is near Danville, owner names and values update on a schedule, so a deed recorded last month might lag behind.
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 Danville.
Using it on a phone
Most viewers work in a phone browser, which helps when you're standing on land near Concord, but coverage can be spotty out of town. A saved image of the lot near Pittsburg and its lines keeps working without signal.
Money questions tied to the zone
For a tract near Antioch, ask for an Elevation Certificate: it compares the building to the BFE. New construction in a floodplain near Pittsburg usually means extra permit review; check with the county or town building office before you plan.
Neighboring parcel maps
Contra Costa County touches Alameda County, Marin County, Sacramento County, San Francisco County, and San Joaquin County, all with their own assessor records. Acreage along the edge near Brentwood may be split in two county records, so open the neighboring map before you assume the acreage. In and around Concord, our state page links every bordering county map across California.
What to request from a seller
Ask the listing agent for any Elevation Certificate for the house near Danville; an insurance quote early avoids surprises.
The paper trail behind a parcel
The map is an index, not the title: deeds, plats and easements for land near Concord are kept by the County Recorder. Older tracts around Clayton may sit on a long string of deeds, and a title company is worth hiring before a purchase.
Questions about the Oakley flood zone map
How often are flood maps updated near Antioch?
In most cases, a new study can move a zone line near Antioch, so look at the panel date.
Is Zone X safe from flooding around Antioch?
In most cases, X zones around Brentwood are lower risk, not no risk, and floods still happen outside high-risk zones.
What does Zone AE mean near Clayton?
It depends, but an AE zone has a 1% annual chance of flooding and a base flood elevation, so builders near Clayton design to that elevation.
Does the county parcel map show flood zones in Oakley?
Good question; a flood layer may appear in the Contra Costa County parcel viewer layer list, though it can lag behind FEMA's current panels.
Who keeps deeds for property in Oakley?
For land near Brentwood, assessment goes to the County Assessor and deeds to the County Recorder; planning offices cover zoning near Pittsburg
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.