521 Black Walnut Pl, Hercules, CA 94547 Property Records

Contra Costa County property record for 521 Black Walnut Pl, Hercules, CA 94547

Property Summary

Property Type	Single Family Home
Details	4 bd · 3 ba · 2,411 sqft · built 2003
Lot Size	0.085 acres (3,680 sqft)
Owner	2 Company Names on Record
Last Sale	$477,000 (Aug 2008)
Tax Bill	$9,697 (2025)
Deeds & Mortgages	Sep 2021 Mortgage Oct 2020 Mortgage + 1 more
Flood Zone	Zone X (minimal risk)
APN	`406-540-053-5`

Property Details

APN / Parcel Number

Primary APN	`406-540-053-5`
Alternative APN	`406-540-053`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Total Rooms	8 Rooms
Stories	2 Stories
Building Area	2,411 sqft Living Area
1st Floor Area	1,432 sqft
2nd Floor Area	979 sqft

Exterior

Year Built	Built 2003
Effective Year Built	Effective 2003
Lot Area	3,680 sqft (0.085 acres)
Garage Type	Attached
Garage Area	436 sqft
Parking Spaces	2 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central

Location & Zoning

Street Address	521 BLACK WALNUT PL
City	HERCULES
State	CA
Zip	94547-2301
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	T8630 L17
Legal Subdivision	SUBDIVISION 8630
Legal Tract	8630
Legal Lot Number	17
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	WEST CONTRA COSTA
Census Block Group	1
Census Block	1001
Census Tract	359203

Owner

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 Company Names on Record
Mailing Address	3155 RIVIERA WAY, SAN RAMON, CA 94583-3229
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
Sep 20, 2021	Deed of Trust, Mortgage · Conventional Mortgage PMAC LENDING SERVICES INC
Oct 29, 2020	Deed of Trust, Mortgage · Conventional Mortgage LENOX FINANCIAL MORTGAGE CORP
Aug 3, 2017	Quit Claim Deed, Transfer ATTORNEY ONLY

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Aug 29, 2008 · Amount on Record
Deed Sale	Aug 29, 2008 · Amount on Record
Prior Sale	Apr 17, 2008 · Amount on Record
Deed Document Number	2008193547
Last Transfer Date	Jul 21, 2017
Transfer Doc	0000139776
Record Updated	Oct 29, 2026

September 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	521 BLACK WALNUT PL, HERCULES, CA 94547-2301
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	WFG NATIONAL TITLE INS CO

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	3155O RIVIERA WAY, SAN RAMON, CA 94583-3229

Mortgage

Document Number	0000261394
Date	Sep 20, 2021
Instrument	2021-261394

Lender

Name	PMAC LENDING SERVICES INC
Type	Mortgage Company
Address	BREA, CA 92821

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	181 Months
Due	Oct 1, 2036

October 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	521 BLACK WALNUT PL, HERCULES, CA 94547-2301
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	FIDELITY TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	3155 RIVIERA WAY, SAN RAMON, CA 94583-3229

Mortgage

Document Number	0000255127
Date	Oct 29, 2020
Instrument	2020-255127

Lender

Name	LENOX FINANCIAL MORTGAGE CORP
Type	Mortgage Company
Address	SANTA ANA, CA 92707

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	181 Months
Due	Nov 1, 2035

August 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Aug 3, 2017
Property Address	521 BLACK WALNUT PL, HERCULES, CA 94547-2301
Document Number	0000139776
Instrument Date	Jul 21, 2017
Instrument	139776
Transaction Type	Transfer
Record Updated	Aug 8, 2017
Title Company	ATTORNEY ONLY

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Personal Trust
Address	3155 RIVIERA WAY SAN RAMON CA 945833229, SAN RAMON, CA 94583-3229

Tax Assessment & Valuation

Source: Contra Costa County assessment roll, as of July 14, 2026

Property Jurisdictions

Type	Name
State	California
County	Contra Costa County
Municipality	Hercules City
Unified School District	West Contra Costa Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$626,529 (+2%) Land $249,559 Building $376,970
2025	$9,697.00 (+5.78%)	$614,245 (+4.04%) Land $244,666 Building $369,579
2023	$9,167.00 (+1.11%)	$590,395 Land $235,166 Building $355,229
2022	$9,066.00

Assessed value is set for property tax purposes and is not a market price estimate.

Flood

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

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	Moderate above 40% of the US · lower than 76% of California
Wildfire Likelihood	0.07% annual chance
Exposure	Direct burnable vegetation

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water System	EAST BAY MUD serves 1,468,000 people · EPA ID CA0110005
Water Source	Surface water
Last State Inspection	Dec 2021
Lead	Under 1 ppb (2022–2024) action level 15 ppb

Violations Reported to EPA

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. This system sells water to local utilities; the supplier billing this address may be one of them.

Internet Providers

Source: FCC Broadband Data Collection, based on 373 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Xfinity Cable	2,000 / 250
Verizon Fixed Wireless	300 / 20
Starlink Satellite	280 / 30
T-Mobile Fixed Wireless	100 / 20
AT&T DSL	100 / 20

May also be available: Unwired.

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