Contra Costa County property record for 4035 Boulder Dr, Antioch, CA 94509
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2 ba · 1,906 sqft · built 1978 |
| Lot Size | 0.228 acres (9,945 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $566,000 (Jun 2005) |
| Tax Bill | $7,296 (2025) |
| Deeds & Mortgages | Jan 2021 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 072-103-002-1 |
| Primary APN | 072-103-002-1 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 9 Rooms |
| Stories | 1 Story |
| Building Area | 1,906 sqft Living Area |
| 1st Floor Area | 1,906 sqft |
| Year Built | Built 1978 |
|---|---|
| Effective Year Built | Effective 1978 |
| Lot Area | 9,945 sqft (0.228 acres) |
| Garage Type | Attached |
| Garage Area | 483 sqft |
| Parking Spaces | 2 Parking Spaces |
| Heating System | Central |
|---|
| Street Address | 4035 BOULDER DR |
|---|---|
| City | ANTIOCH |
| State | CA |
| Zip | 94509-6234 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1 |
| Legal Description | TRACT 4693 LOT 181 EX 1/4 MR |
| Legal Subdivision | SUBDIVISION 4693 |
| Legal Tract | 4693 |
| Legal Lot Number | 181 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | ANTIOCH-PITTSBURG |
| Census Block Group | 1 |
| Census Block | 1011 |
| Census Tract | 355109 |
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 | 2 Individual Names on Record |
|---|---|
| Mailing Address | 4035 BOULDER DR, ANTIOCH, CA 94509-6234 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Jun 10, 2005 · Amount on Record |
| Deed Sale | Jun 10, 2005 · Amount on Record |
| Deed Document Number | 2005208731 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Property Address | 4035 BOULDER DR, ANTIOCH, CA 94509-6234 |
| Transaction Type | Mortgage |
| Record Updated | Nov 3, 2022 |
| Title Company | WFG LENDER SERVICES |
| Name | Verified Name |
|---|---|
| Address | 4035 BOULDER DR, ANTIOCH, CA 94509-6234 |
| Document Number | 0000001755 |
|---|---|
| Date | Jan 5, 2021 |
| Instrument | 2021-001755 |
| Name | LENOX FINANCIAL MORTGAGE CORP |
|---|---|
| Type | Mortgage Company |
| Address | SANTA ANA, CA 92707 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 360 Months |
| Due | Jan 1, 2051 |
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 | $608,000 (-) Land $322,320 Building $285,680 | |
| 2025 | $7,296.00 (+2.43%) Homeowner's exemption | $608,000 (+1.33%) Land $322,320 Building $285,680 |
| 2023 | $7,123.00 (-0.22%) Homeowner's exemption | $600,000 Land $318,079 Building $281,921 |
| 2022 | $7,139.00 |
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
| 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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 0.01% annual chance |
| Exposure | None beyond 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 645 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 |
| AT&T DSL | 100 / 20 |
May also be available: Verizon.
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