Contra Costa County property record for 4509 Thoroughbred Ct, Antioch, CA 94531
| Property Type | Single Family Home |
|---|---|
| Details | 6 bd · 3 ba · 3,469 sqft · built 1999 |
| Lot Size | 0.185 acres (8,040 sqft) |
| Owner | Individual Name on File |
| Last Sale | $285,000 (Aug 2009) |
| Tax Bill | $5,063 (2025) |
| Deeds & Mortgages | Oct 2021 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 053-570-038-9 |
| Primary APN | 053-570-038-9 |
|---|---|
| Alternative APN |
|
| Bedrooms | 6 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 12 Rooms |
| Stories | 2 Stories |
| Building Area | 3,469 sqft Living Area |
| 1st Floor Area | 2,091 sqft |
| 2nd Floor Area | 1,378 sqft |
| Year Built | Built 1999 |
|---|---|
| Effective Year Built | Effective 2000 |
| Lot Area | 8,040 sqft (0.185 acres) |
| Garage Type | Attached |
| Garage Area | 647 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|
| Street Address | 4509 THOROUGHBRED CT |
|---|---|
| City | ANTIOCH |
| State | CA |
| Zip | 94531-9316 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T7459 L563 |
| Legal Subdivision | SUBDIVISION 7459 |
| Legal Tract | 7459 |
| Legal Lot Number | 563 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | EAST CONTRA COSTA |
| Census Block Group | 4 |
| Census Block | 4007 |
| Census Tract | 302009 |
4509 Thoroughbred Ct is owned and occupied by an individual who acquired it in September 2021.
Source: Contra Costa County records, as of July 14, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 4509 THOROUGHBRED CT, ANTIOCH, CA 94531-9316 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Aug 17, 2009 · Amount on File |
| Deed Sale | Aug 17, 2009 · Amount on File |
| Prior Sale | Mar 27, 2009 · Amount on File |
| Deed Document Number | 2009198607 |
| Last Transfer Date | Sep 22, 2021 |
| Transfer Doc | 0000273841 |
| Record Updated | Oct 29, 2026 |
| Document Type | Affidavit of Death of Joint Tenant |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Oct 4, 2021 |
| Property Address | 4509 THOROUGHBRED CT, ANTIOCH, CA 94531-9316 |
| Document Number | 0000273841 |
| Map Reference | MB 408 PG 23 |
| Instrument Date | Sep 22, 2021 |
| Instrument | 2021-273841 |
| Transaction Type | Transfer |
| Record Updated | Nov 3, 2022 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 4509 THOROUGHBRED CT, ANTIOCH, CA 94531-9316 |
The 2025 property tax bill for 4509 Thoroughbred Ct was $5,063.
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Antioch City |
| Unified School District | Antioch Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $417,357 (+2%) Land $39,491 Building $377,866 | |
| 2025 | $5,063.00 | $409,174 Land $38,717 Building $370,457 |
| 2023 | $4,771.00 (+1.51%) | $393,287 Land $37,214 Building $356,073 |
| 2022 | $4,700.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 4509 Thoroughbred Ct in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 6 (20% premium discount) |
| Nearby Flood Policies | 2 in force |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
The area around 4509 Thoroughbred Ct has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | CITY OF ANTIOCH serves 116,781 people · EPA ID CA0710001 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jan 2024 |
| Lead | Under 1 ppb (2022–2024) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.
Source: FCC Broadband Data Collection, based on 566 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T DSL · Fiber, Fixed Wireless in parts of the area | 100 / 20 |
May also be available: Verizon.
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