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512 Black Walnut Pl, Hercules, CA 94547 Property Records

Contra Costa County property record for 512 Black Walnut Pl, Hercules, CA 94547

Property Summary

Property TypeSingle Family Home
Details4 bd · 2.5 ba · 2,125 sqft · built 2002
Lot Size0.102 acres (4,454 sqft)
Owner2 Individual Names on Record
Last Sale$540,000 (Oct 2017)
Tax Bill$10,319 (2025)
Deeds & MortgagesJan 2024 Mortgage
Oct 2017 Sale & Mortgage
Flood ZoneZone X (minimal risk)
APN406-540-016-2

Property Details

APN / Parcel Number

Primary APN406-540-016-2
Alternative APN
  • 406-540-016

Interior

Bedrooms4 Beds
Full Baths2.5 Baths
Half Baths1 Half Bath
Total Rooms9 Rooms
Stories2 Stories
Building Area2,125 sqft Living Area
1st Floor Area920 sqft
2nd Floor Area1,205 sqft

Exterior

Year BuiltBuilt 2002
Effective Year BuiltEffective 2002
Architectural StyleCluster
Lot Area4,454 sqft (0.102 acres)
Garage TypeAttached
Garage Area415 sqft
Parking Spaces2 Parking Spaces

Utilities, Heating & Cooling

Cooling SystemCentral

Location & Zoning

Street Address512 BLACK WALNUT PL
CityHERCULES
StateCA
Zip94547-2300
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal DescriptionT8422 L16
Legal SubdivisionSUBDIVISION 8422
Legal Tract8422
Legal Lot Number16
JurisdictionCONTRA COSTA CA
Township / Civil DivisionWEST CONTRA COSTA
Census Block Group1
Census Block1001
Census Tract359203

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 Record2 Individual Names on Record
Mailing Address512 BLACK WALNUT PL, HERCULES, CA 94547-2300
OccupancyOwner Occupied
Owner TypeIndividual
VestingJoint Tenants

Deeds, Mortgages & Sale History

DateDocument
Jan 19, 2024Deed of Trust, Mortgage · Commercial Mortgage
UNLOCK PARTNERSHIP SOLUTIONS INC
Oct 31, 2017Grant Deed, Transfer · Conventional Mortgage
SUMMIT FUNDING INC

Assessor's Deed Record

Deed Names2 Names on Deed
Last SaleOct 31, 2017 · Amount on Record
Deed SaleOct 31, 2017 · Amount on Record
Prior SaleDec 27, 2002 · Amount on Record
Deed Document Number2017205416
Prior Transfer DateDec 23, 2002
Prior Transfer Doc0000497812
Record UpdatedOct 29, 2026

January 2024: Deed of Trust, Mortgage

Document TypeDeed of Trust
JurisdictionCONTRA COSTA CA
Property Address512 BLACK WALNUT PL, HERCULES, CA 94547-2300
Transaction TypeMortgage
Record UpdatedJan 29, 2024

Transferred To (Grantee/Buyer)

NameVerified Name

Mortgage

Document Number0000005792
DateJan 19, 2024
Instrument2024-005792
Lender
NameUNLOCK PARTNERSHIP SOLUTIONS INC
TypeNon-Lending Institution
AddressHERCULES, CA 94547
Agreement
TypeCommercial Mortgage
AmountAmount Recorded

October 2017: Grant Deed, Transfer

Document TypeGrant Deed
JurisdictionCONTRA COSTA CA
Recording DateOct 31, 2017
Property Address512 BLACK WALNUT PL, HERCULES, CA 94547-2300
Document Number0000205416
Map ReferenceMAP431 PG41
Instrument DateOct 25, 2017
Instrument2017-205416
Transaction TypeTransfer
Record UpdatedNov 3, 2022
Title CompanyOLD REPUBLIC TITLE CO HILLTO

Transaction

AmountAmount Recorded
DownpaymentDownpayment on Record
Loan-to-Value (LTV)LTV on Record
Tax$0.00
Amount AccuracyRounded by County
Additional
  • Arm's Length

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipJoint Tenants
Address51 BLACK WALNUT PL, HERCULES, CA 94547

Mortgage

Document Number0000205417
DateOct 31, 2017
Instrument2017-205417
Lender
NameSUMMIT FUNDING INC
TypeMortgage Company
Agreement
TypeConventional Mortgage
AmountAmount Recorded
Term361 Months
DueNov 1, 2047

Tax Assessment & Valuation

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

Property Jurisdictions

TypeName
StateCalifornia
CountyContra Costa County
MunicipalityHercules City
Unified School DistrictWest Contra Costa Unified School District (KG - 12)

Tax Bill & Assessment History

YearTax BillAssessed Value
2026$684,739 (+2%) Land $336,566 Building $348,173
2025$10,319.00 (+5.74%) Homeowner's exemption$671,314 (+4.04%) Land $329,967 Building $341,347
2023$9,759.00 (+1.13%) Homeowner's exemption$645,248 Land $317,155 Building $328,093
2022$9,650.00

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 ZoneZone X
minimal risk
Flood Insurance RequirementNot 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 RiskModerate
above 40% of the US · lower than 76% of California
Wildfire Likelihood0.07% annual chance
ExposureDirect
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 SystemEAST BAY MUD
serves 1,468,000 people · EPA ID CA0110005
Water SourceSurface water
Last State InspectionDec 2021
LeadUnder 1 ppb (2022–2024)
action level 15 ppb

Violations Reported to EPA

Water QualityNone
last 10 years
Treatment and ProcedureNone
last 10 years
Monitoring and ReportingNone
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

ProviderMax 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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