Contra Costa County property record for 4135 Mt Isabel Rd, Antioch, CA 94531
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 2,085 sqft · built 2001 |
| Lot Size | 0.351 acres (15,308 sqft) |
| Owner | Individual Name on File |
| Last Sale | $238,000 (Feb 2009) |
| Tax Bill | $3,858 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 055-650-017-1 |
| Primary APN | 055-650-017-1 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 9 Rooms |
| Stories | 2 Stories |
| Building Area | 2,085 sqft Living Area |
| 1st Floor Area | 1,102 sqft |
| 2nd Floor Area | 983 sqft |
| Year Built | Built 2001 |
|---|---|
| Effective Year Built | Effective 2002 |
| Lot Area | 15,308 sqft (0.351 acres) |
| Garage Type | Attached |
| Garage Area | 472 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|
| Street Address | 4135 MOUNT ISABEL RD |
|---|---|
| City | ANTIOCH |
| State | CA |
| Zip | 94531-9107 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | A-2 |
| Legal Description | T8410 L92 |
| Legal Tract | 8410 |
| Legal Lot Number | 92 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | TASSAJARA |
| Census Block Group | 1 |
| Census Block | 1002 |
| Census Tract | 355118 |
4135 Mt Isabel Rd is owned and occupied by an individual who bought it in February 2009.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 4135 MOUNT ISABEL RD, ANTIOCH, CA 94531-9107 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Single Person |
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 | Name on Deed |
|---|---|
| Last Sale | Feb 13, 2009 · Amount on File |
| Deed Sale | Feb 13, 2009 · Amount on File |
| Prior Sale | May 15, 2008 · Amount on File |
| Deed Document Number | 200929633 |
| Prior Transfer Date | Feb 4, 2009 |
| Prior Transfer Doc | 0000029634 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 4135 Mt Isabel Rd was $3,858 with a homeowner's exemption.
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 | $312,599 (+2%) Land $39,395 Building $273,204 | |
| 2025 | $3,858.00 Homeowner's exemption | $306,471 Land $38,623 Building $267,848 |
| 2023 | $3,624.00 (+1.48%) Homeowner's exemption | $294,573 Land $37,124 Building $257,449 |
| 2022 | $3,571.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 4135 Mt Isabel Rd in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 4135 Mt Isabel Rd is low, with a 0.04% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 67% of the US · lower than 81% of California |
|---|---|
| Wildfire Likelihood | 0.04% annual chance |
| Exposure | Indirect 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 675 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
May also be available: Unwired.
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