309 Potomac Way, Martinez, CA 94553 Property Records

Contra Costa County property record for 309 Potomac Way, Martinez, CA 94553

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,442 sqft · built 1963
Lot Size	0.202 acres (8,800 sqft)
Owner	Individual Name on Record
Last Sale	$935,000 (Oct 2024)
Tax Bill	$11,437 (2025)
Deeds & Mortgages	May 2017 Mortgage Dec 2018 Construction Loan
Flood Zone	Zone X (minimal risk)
APN	`164-193-004-3`

Property Details

APN / Parcel Number

Primary APN	`164-193-004-3`
Alternative APN	`164-193-004`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	8 Rooms
Stories	1 Story
Building Area	1,442 sqft Living Area
1st Floor Area	1,442 sqft

Exterior

Year Built	Built 1963
Effective Year Built	Effective 1980
Lot Area	8,800 sqft (0.202 acres)
Garage Type	Attached
Garage Area	460 sqft
Parking Spaces	2 Parking Spaces

Location & Zoning

Street Address	309 POTOMAC WAY
City	MARTINEZ
State	CA
Zip	94553-6222
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	TRACT 3000 LOT 100 EX MR
Legal Subdivision	VIRGINIA HILLS 1 SUB 3000
Legal Tract	3000
Legal Lot Number	100
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	CENTRAL CONTRA COSTA
Census Block Group	1
Census Block	1002
Census Tract	321103

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	Individual Name on Record
Mailing Address	309 POTOMAC WAY, MARTINEZ, CA 94553-6222
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Unmarried Woman

Deeds, Mortgages & Sale History

Date	Document
May 11, 2017	Deed of Trust, Mortgage · Conventional Mortgage CONGRESSIONAL BANK
Dec 28, 2018	Trustee's Deed, Construction Loan · Construction Mortgage DISCOVER BK

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Oct 22, 2024 · Amount on Record
Deed Sale	Oct 22, 2024 · Amount on Record
Prior Sale	Jun 30, 2000 · Amount on Record
Deed Document Number	2024105851
Record Updated	Oct 29, 2026

May 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	309 POTOMAC WAY, MARTINEZ, CA 94553-6222
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	RESOURCE REAL ESTATE SVCS LL

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000082146
Date	May 11, 2017
Instrument	2017-082146

Lender

Name	CONGRESSIONAL BANK
Type	Bank
Address	BETHESDA, MD 20817

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	180 Months
Due	May 1, 2032

December 2018: Trustee's Deed, Construction Loan

Document Type	Trustee's Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Dec 28, 2018
Property Address	309 POTOMAC WAY, MARTINEZ, CA 94553-6222
Instrument Date	Dec 22, 2018
Instrument	207195
Transaction Type	Construction Loan
Record Updated	Jan 14, 2019
Title Company	OTHER

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants with Right of Survivorship
Address	309 POTOMAC WAY MARTINEZ CA 945536222, MARTINEZ, CA 94553-6222

Mortgage

Document Number	0000207195
Date	Dec 28, 2018
Instrument	207195

Lender

Name	DISCOVER BK
Type	Bank
Address	NEW CASTLE, DE 19720

Agreement

Type	Construction Mortgage
Amount	Amount Recorded
Term	180 Months
Due	Dec 27, 2033

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	Martinez City
Unified School District	Mount Diablo Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$953,700 (+2%) Land $663,000 Building $290,700
2025	$11,437.00 (+100.58%)	$935,000 (+115.29%) Land $650,000 Building $285,000
2023	$5,702.00 (+0.85%) Homeowner's exemption	$434,303 Land $292,419 Building $141,884
2022	$5,654.00

Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.

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	Low lower than 80% of the US · lower than 88% of California
Wildfire Likelihood	0.01% annual chance
Exposure	None 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 System	CITY OF MARTINEZ serves 31,015 people · EPA ID CA0710006
Water Source	Purchased surface water from CONTRA COSTA WATER DISTRICT
Last State Inspection	Oct 2025
Lead	Under 1 ppb (2023–2025) 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.

Internet Providers

Source: FCC Broadband Data Collection, based on 548 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Xfinity Cable	2,000 / 250
Unwired Fixed Wireless	300 / 25
Verizon Fixed Wireless	300 / 20
AT&T DSL	100 / 20

May also be available: T-Mobile.

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