Contra Costa County property record for 328 San Joaquin Ave, Antioch, CA 94509
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 1 ba · 1,314 sqft · built 1946 |
| Lot Size | 0.116 acres (5,035 sqft) |
| Owner | 2 Individual Names on File |
| Tax Bill | $2,134 (2025) |
| Deeds & Mortgages | Oct 2017 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 071-043-014-1 |
| Primary APN | 071-043-014-1 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,314 sqft Living Area |
| 1st Floor Area | 1,314 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1946 |
|---|---|
| Effective Year Built | Effective 1950 |
| Architectural Style | Traditional |
| Exterior Material | Wood Siding |
| Roof Material | Composition Shingle |
| Lot Area | 5,035 sqft (0.116 acres) |
| Heating System | Floor/Wall Furnace |
|---|---|
| Heating Fuel | Gas |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 328 SAN JOAQUIN AVE |
|---|---|
| City | ANTIOCH |
| State | CA |
| Zip | 94509-4871 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1 |
| Legal Description | MISSION SUBN LOT 21 |
| Legal Subdivision | MISSION SUB |
| Legal Lot Number | 21 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | ANTIOCH-PITTSBURG |
| Census Block Group | 4 |
| Census Block | 4011 |
| Census Tract | 307102 |
328 San Joaquin Ave is owned and occupied by two individuals.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 328 SAN JOAQUIN AVE, ANTIOCH, CA 94509-4871 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Property Address | 328 SAN JOAQUIN AVE, ANTIOCH, CA 94509-4871 |
| Transaction Type | Mortgage |
| Record Updated | Nov 3, 2022 |
| Title Company | SERVICELINK |
| Name | Verified Name |
|---|
| Document Number | 0000195099 |
|---|---|
| Date | Oct 24, 2017 |
| Instrument | 2017-195099 |
| Name | CAPITAL ONE NA |
|---|---|
| Type | Bank |
| Address | PLANO, TX 75024 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Nov 1, 2047 |
The 2025 property tax bill for 328 San Joaquin Ave was $2,134.
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 | $142,138 (+2%) Land $59,899 Building $82,239 | |
| 2025 | $2,134.00 | $139,352 Land $58,725 Building $80,627 |
| 2023 | $2,005.00 (+1.31%) | $133,944 Land $56,446 Building $77,498 |
| 2022 | $1,979.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 328 San Joaquin Ave in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 1989.
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.
The area around 328 San Joaquin Ave 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 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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