Contra Costa County property record for 527 Black Walnut Pl, Hercules, CA 94547
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 2,095 sqft · built 2003 |
| Lot Size | 0.075 acres (3,270 sqft) |
| Owner | Individual Name on File |
| Last Sale | $464,500 (Feb 2003) |
| Tax Bill | $10,330 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 406-540-054-3 |
| Primary APN | 406-540-054-3 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 8 Rooms |
| Stories | 2 Stories |
| Building Area | 2,095 sqft Living Area |
| 1st Floor Area | 970 sqft |
| 2nd Floor Area | 1,125 sqft |
| Year Built | Built 2003 |
|---|---|
| Effective Year Built | Effective 2003 |
| Lot Area | 3,270 sqft (0.075 acres) |
| Garage Type | Attached |
| Garage Area | 395 sqft |
| Parking Spaces | 1 Parking Space |
| Street Address | 527 BLACK WALNUT PL |
|---|---|
| City | HERCULES |
| State | CA |
| Zip | 94547-2301 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T8630 L18 |
| Legal Tract | 8630 |
| Legal Lot Number | 18 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | WEST CONTRA COSTA |
| Census Block Group | 1 |
| Census Block | 1001 |
| Census Tract | 359203 |
Source: Contra Costa County records · APN 406-540-054-3
Assessment roll updated July 14, 2026 · Last verified July 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 527 BLACK WALNUT PL, HERCULES, CA 94547-2301 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | Feb 26, 2003 · Amount on Record |
| Deed Sale | Feb 26, 2003 · Amount on Record |
| Deed Document Number | 200388597 |
| Last Transfer Date | Mar 15, 2013 |
| Transfer Doc | 0000073463 |
| Record Updated | Sep 20, 2026 |
Source: Contra Costa County records · Assessment roll updated July 14, 2026 · Last verified July 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Hercules City |
| Unified School District | West Contra Costa Unified School District (KG - 12) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $685,744 (+2%) Land $265,903 Building $419,841 | |
| 2025 | $10,330.00 (+5.75%) Homeowner's exemption | $672,299 (+4.04%) Land $260,690 Building $411,609 |
| 2023 | $9,768.00 (+1.12%) Homeowner's exemption | $646,195 Land $250,568 Building $395,627 |
| 2022 | $9,660.00 |
Source: FEMA National Flood Hazard Layer as of October 12, 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Wildfire Risk | Moderate above 40% of the US · lower than 76% of California |
|---|---|
| Wildfire Likelihood | 0.07% annual chance |
| Exposure | Direct burnable vegetation at the parcel |
Values are read at the parcel center point; lenders make the official flood determination.
Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| Starlink Satellite | 280 / 30 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
| AT&T DSL | 100 / 20 |
May also be available: Unwired.
Based on FCC filings for 373 locations within half a mile of this property.
Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | EAST BAY MUD serves 1,468,000 people |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Dec 2021 |
| 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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. This system sells water to local utilities; the supplier billing this address may be one of them. The full violation and enforcement history is in the system's EPA record.
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