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509 Elderwood Dr, Martinez, CA 94553 Property Records

Contra Costa County property record for 509 Elderwood Dr, Martinez, CA 94553

Property Summary

Property TypeSingle Family Home
Details4 bd · 2.5 ba · 1,914 sqft · built 1986
Lot Size0.199 acres (8,680 sqft)
Owner2 Individual Names on File
Last Sale$250,000 (Dec 1993)
Tax Bill$5,720 (2025)
Deeds & MortgagesFeb 2021 Transfer
Flood ZoneZone X (minimal risk)
APN155-450-001-5

Property Details

APN / Parcel Number

Primary APN155-450-001-5
Alternative APN
  • 155-450-001

Interior

Bedrooms4 Beds
Full Baths2.5 Baths
Half Baths1 Half Bath
Total Rooms10 Rooms
Stories2 Stories
Building Area1,914 sqft Living Area
1st Floor Area1,022 sqft
2nd Floor Area892 sqft

Exterior

Year BuiltBuilt 1986
Effective Year BuiltEffective 1988
Lot Area8,680 sqft (0.199 acres)
Garage TypeAttached
Garage Area528 sqft
Parking Spaces2 Parking Spaces

Location & Zoning

Street Address509 ELDERWOOD DR
CityMARTINEZ
StateCA
Zip94553-6613
Property CategoryResidential
Property TypeResidential > Single Family > Home
Local Zoning CodeR6
Legal DescriptionT05127 L0050 B
Legal SubdivisionSUBDIVISION 5127
Legal Tract05127
Legal Lot Number50
JurisdictionCONTRA COSTA CA
Township / Civil DivisionCENTRAL CONTRA COSTA
Census Block Group2
Census Block2001
Census Tract321102

Owner

509 Elderwood Dr is owned by two individuals who acquired it in January 2021.

Source: Contra Costa County records, as of July 14, 2026

Owner of Record2 Individual Names on File
Mailing Address1446 RELIEZ VALLEY RD, LAFAYETTE, CA 94549-2319
Owner TypeIndividual

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names2 Names on Deed
Last SaleDec 30, 1993 · Amount on File
Deed SaleDec 30, 1993 · Amount on File
Deed Document Number1993376179
Deed Book / Page19328 / 422
Last Transfer DateJan 29, 2021
Transfer Doc0000030547
Record UpdatedSep 20, 2026

February 2021: Intrafamily Transfer, Transfer

Document TypeIntrafamily Transfer
JurisdictionCONTRA COSTA CA
Recording DateFeb 1, 2021
Property Address509 ELDERWOOD DR, MARTINEZ, CA 94553-6613
Document Number0000030547
Map ReferenceMB 230 PG 44
Instrument DateJan 29, 2021
Instrument2021-030547
Transaction TypeTransfer
Record UpdatedNov 3, 2022

Transaction

Tax$0.00
Amount AccuracyTransfer Tax Exempt
Additional
  • Intrafamily Transfer

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipJoint Tenants with Right of Survivorship
Address1446 RELIEZ VALLEY RD, LAFAYETTE, CA 94549-2319

Tax Assessment & Valuation

The 2025 property tax bill for 509 Elderwood Dr was $5,720.

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

Property Jurisdictions

TypeName
StateCalifornia
CountyContra Costa County
MunicipalityMartinez City
Unified School DistrictMount Diablo Unified School District (KG - 12)

Tax Bill & Assessment History

YearTax BillAssessed Value
2026$433,389 (+2%) Land $156,014 Building $277,375
2025$5,720.00$424,892 Land $152,955 Building $271,937
2023$5,488.00 (+0.85%)$408,394 Land $147,016 Building $261,378
2022$5,442.00

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

Flood

FEMA maps place 509 Elderwood Dr in Zone X, an area of minimal flood risk, though there have been 3 flood claims nearby since 1983.

Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood ZoneZone X
minimal risk
Flood Insurance RequirementNot required
lenders may require it
Community Rating SystemClass 9 (5% premium discount)
Nearby Flood Policies1 in force
Nearby Flood Claims3 (1983–2018)
Claims Outside the SFHA2 of 3
Most Recent ClaimNov 2018 · rainfall accumulation

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Wildfire

Wildfire risk around 509 Elderwood Dr is low, with a 0.01% annual chance of wildfire.

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

Wildfire RiskLow
lower than 96% of the US · lower than 97.4% of California
Wildfire Likelihood0.01% annual chance
ExposureNone
beyond ember reach

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 SystemCONTRA COSTA WATER DISTRICT
serves 210,500 people · EPA ID CA0710003
Water SourceSurface water
Last State InspectionJan 2022
LeadUnder 1 ppb (2026–2028)
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 368 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
Xfinity
Cable		2,000 / 250
Unwired
Fixed Wireless		300 / 25
T-Mobile
Fixed Wireless		100 / 20
AT&T
DSL		100 / 20

May also be available: Verizon.

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