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509 Graphite Ct, Antioch, CA 94509 Property Records

Contra Costa County property record for 509 Graphite Ct, Antioch, CA 94509

Property Summary

Property TypeSingle Family Home
Details4 bd · 2.5 ba · 2,454 sqft · built 1999
Lot Size0.201 acres (8,738 sqft)
OwnerCompany Name on File
Last Sale$275,000 (Nov 2008)
Tax Bill$4,400 (2025)
Flood ZoneZone X (minimal risk)
APN068-640-006

Property Details

APN / Parcel Number

Primary APN068-640-006
Alternative APN
  • 068-640-006-0

Interior

Bedrooms4 Beds
Full Baths2.5 Baths
Half Baths1 Half Bath
Total Rooms10 Rooms
Stories2 Stories
Building Area2,454 sqft Living Area
1st Floor Area1,209 sqft
2nd Floor Area1,245 sqft

Exterior

Year BuiltBuilt 1999
Effective Year BuiltEffective 2000
Lot Area8,738 sqft (0.201 acres)
Garage TypeAttached
Garage Area599 sqft
Parking Spaces2 Parking Spaces

Utilities, Heating & Cooling

Cooling SystemCentral

Location & Zoning

Street Address509 GRAPHITE CT
CityANTIOCH
StateCA
Zip94509-6862
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal DescriptionT8102 L250
Legal Tract8102
Legal Lot Number250
JurisdictionCONTRA COSTA CA
Township / Civil DivisionANTIOCH-PITTSBURG
Census Block Group1
Census Block1002
Census Tract355109

Owner

Source: Contra Costa County assessment roll, 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 RecordCompany Name on File
Mailing Address509 GRAPHITE CT, ANTIOCH, CA 94509-6862
Owner TypeCompany
VestingTrust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed NamesVerified Name on Deed
Last SaleNov 14, 2008 · Amount on Record
Deed SaleNov 14, 2008 · Amount on Record
Prior SaleOct 1, 2008 · Amount on Record
Deed Document Number2008249011
Last Transfer DateAug 2, 2010
Transfer Doc0000217875
Record UpdatedSep 20, 2026

Tax Assessment & Valuation

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

Property Jurisdictions

TypeName
StateCalifornia
CountyContra Costa County
MunicipalityAntioch City
Unified School DistrictAntioch Unified School District (KG - 12)

Tax Bill & Assessment History

YearTax BillAssessed Value
2026$361,067 (+2%) Land $65,666 Building $295,401
2025$4,400.00 (+6.33%)$353,988 (+4.04%) Land $64,379 Building $289,609
2023$4,138.00 (+1.5%)$340,244 Land $61,880 Building $278,364
2022$4,077.00

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 RiskLow
lower than 80% of the US · lower than 88% of California
Wildfire Likelihood0.01% annual chance
ExposureNone
beyond ember reach

Drinking Water

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

Water SystemCITY OF ANTIOCH
serves 116,781 people · EPA ID CA0710001
Water SourceSurface water
Last State InspectionJan 2024
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.

Internet Providers

Source: FCC Broadband Data Collection, based on 645 locations within half a mile, as of December 31, 2025

ProviderMax 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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