Contra Costa County property record for 504 San Joaquin Ave, Antioch, CA 94509
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1 ba · 1,086 sqft · built 1948 |
| Lot Size | 0.116 acres (5,035 sqft) |
| Owner | Company Name on Record |
| Last Sale | $145,000 (Sep 2003) |
| Tax Bill | $4,551 (2025) |
| Deeds & Mortgages | Feb 2017 Transfer Feb 2017 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 071-031-014-5 |
| Primary APN | 071-031-014-5 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 1,086 sqft Living Area |
| 1st Floor Area | 1,086 sqft |
| Year Built | Built 1948 |
|---|---|
| Effective Year Built | Effective 1948 |
| Lot Area | 5,035 sqft (0.116 acres) |
| Garage Type | Attached |
| Garage Area | 256 sqft |
| Parking Spaces | 1 Parking Space |
| Street Address | 504 SAN JOAQUIN AVE |
|---|---|
| City | ANTIOCH |
| State | CA |
| Zip | 94509-4857 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1 |
| Legal Description | MISSION SUBN LOT 87 |
| Legal Subdivision | MISSION SUB |
| Legal Lot Number | 87 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | ANTIOCH-PITTSBURG |
| Census Block Group | 4 |
| Census Block | 4009 |
| Census Tract | 307102 |
Source: Contra Costa County records, as of July 14, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Company Name on Record |
|---|---|
| Mailing Address | 341 W BOLTON RD, OAKLEY, CA 94561-2718 |
| Owner Type | Company |
| Vesting | Trust |
| Date | Document |
|---|---|
| Feb 17, 2017 | Quit Claim Deed, Transfer Quitclaim |
| Feb 7, 2017 | Quit Claim Deed, Transfer Quitclaim |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Sep 30, 2003 · Amount on Record |
| Deed Sale | Sep 30, 2003 · Amount on Record |
| Deed Document Number | 2003487846 |
| Last Transfer Date | Jan 31, 2017 |
| Transfer Doc | 0000030840 |
| Record Updated | Oct 29, 2026 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Feb 17, 2017 |
| Property Address | 504 SAN JOAQUIN AVE, ANTIOCH, CA 94509-4857 |
| Document Number | 0000030840 |
| Instrument Date | Jan 31, 2017 |
| Instrument | 30840 |
| Transaction Type | Transfer |
| Record Updated | Feb 23, 2017 |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Revocable Trust |
| Address | 349 N CIVIC DR #301 ANTIOCH CA 94509, 301, ANTIOCH, CA 94509 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Feb 7, 2017 |
| Property Address | 504 SAN JOAQUIN AVE, ANTIOCH, CA 94509-4857 |
| Document Number | 0000024000 |
| Instrument Date | Jan 31, 2017 |
| Instrument | 24000 |
| Transaction Type | Transfer |
| Record Updated | Feb 20, 2017 |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Separate Estate/Property |
| Address | 340 N CIVIC DR #301 WALNUT CREEK CA 945963614, 301, WALNUT CREEK, CA 94596-3614 |
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 | $362,540 (+2%) Land $217,526 Building $145,014 | |
| 2025 | $4,551.00 (+5.32%) | $355,432 (+4.04%) Land $213,261 Building $142,171 |
| 2023 | $4,321.00 (+1.55%) | $341,632 Land $204,981 Building $136,651 |
| 2022 | $4,255.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
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 |
| Nearby Flood Policies | 4 in force |
| Nearby Flood Claims | 1 (1989) |
| Most Recent Claim | Sep 1989 · rainfall accumulation |
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.
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 579 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · DSL | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
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