4131 S Castro St, Martinez, CA 94553 Property Records

Contra Costa County property record for 4131 S Castro St, Martinez, CA 94553

Property Summary

Property Type	Single Family Home
Details	4 bd · 3 ba · 1,955 sqft · built 1948
Lot Size	0.18 acres (7,840 sqft)
Owner	2 Individual Names on File
Last Sale	$685,000 (Nov 2024)
Tax Bill	$9,021 (2025)
Deeds & Mortgages	Oct 2022 Mortgage Jun 2020 Transfer + 1 more
Flood Zone	Zone AO (high risk)
APN	`370-291-011-2`

Property Details

APN / Parcel Number

Primary APN	`370-291-011-2`
Alternative APN	`370-291-011`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Total Rooms	8 Rooms
Stories	1 Story
Building Area	1,955 sqft Living Area
Gross Area	1,605 sqft
1st Floor Area	1,605 sqft

Exterior

Year Built	Built 1948
Effective Year Built	Effective 1970
Lot Area	7,840 sqft (0.18 acres)
Garage Type	Attached
Garage Area	419 sqft
Parking Spaces	2 Parking Spaces

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	4131 S CASTRO ST
City	MARTINEZ
State	CA
Zip	94553-3951
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	POR RO EL PINOLE
Legal Subdivision	EL PINOLE RHO
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	CENTRAL CONTRA COSTA
Census Block Group	3
Census Block	3017
Census Tract	318000

Owner

4131 S Castro St is owned and occupied by two individuals who bought it in November 2024.

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

Owner of Record	2 Individual Names on File
Mailing Address	4131 S CASTRO ST, MARTINEZ, CA 94553-3951
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Community Property

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

Date	Document
Oct 11, 2022	Intrafamily Transfer, Transfer · Commercial Mortgage VELOCITY COMMERCIAL CAPITAL LLC
Jun 9, 2020	Quit Claim Deed, Transfer ATTORNEY ONLY
Mar 13, 2017	Quit Claim Deed, Transfer ATTORNEY ONLY

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Nov 25, 2024 · Amount on File
Deed Sale	Nov 25, 2024 · Amount on File
Prior Sale	Oct 14, 2015 · Amount on File
Deed Document Number	2024127602
Prior Transfer Date	May 6, 2020
Prior Transfer Doc	0000109605
Record Updated	Oct 29, 2026

October 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	CONTRA COSTA CA
Recording Date	Oct 11, 2022
Property Address	4131 S CASTRO ST, MARTINEZ, CA 94553-3951
Document Number	0000152495
Instrument Date	Oct 7, 2022
Instrument	2022-152495
Transaction Type	Transfer
Record Updated	Nov 3, 2022
Title Company	OLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants
Address	243 BUCK CREEK CT, MARTINEZ, CA 94553-9678

Mortgage

Document Number	0000152496
Date	Oct 11, 2022
Instrument	2022-152496

Lender

Name	VELOCITY COMMERCIAL CAPITAL LLC
Type	Non-Lending Institution

Agreement

Type	Commercial Mortgage
Amount	Amount on Record

June 2020: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Jun 9, 2020
Property Address	4131 S CASTRO ST, MARTINEZ, CA 94553-3951
Document Number	0000109605
Instrument Date	May 6, 2020
Instrument	109605
Transaction Type	Transfer
Record Updated	Jun 17, 2020
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	Revocable Trust
Address	243 BUCK CREEK CT MARTINEZ CA 945539678, MARTINEZ, CA 94553-9678

March 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Mar 13, 2017
Property Address	4131 S CASTRO ST, MARTINEZ, CA 94553-3951
Document Number	0000043872
Instrument Date	Feb 26, 2017
Instrument	43872
Transaction Type	Transfer
Record Updated	Mar 17, 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	Living Trust
Address	4131 S CASTRO ST MARTINEZ CA 945533951, MARTINEZ, CA 94553-3951

Tax Assessment & Valuation

The 2025 property tax bill for 4131 S Castro St was $9,021 with a homeowner's exemption.

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	Martinez Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$698,700 (+2%) Land $367,200 Building $331,500
2025	$9,021.00	$685,000 Land $360,000 Building $325,000
2023	$7,620.00 (+1.65%)	$583,700 Land $419,288 Building $164,412
2022	$7,496.00

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

Flood

FEMA maps place 4131 S Castro St in Zone AO, a high-risk flood area; flood insurance is required for federally backed loans.

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

FEMA Flood Zone	Zone AO high risk · sheet flow 1–3 ft
100-Year Floodplain	Yes 1% annual chance
Floodway	No
Base Flood Elevation	Varies along the reach; see FIRM
Flood Insurance Requirement	Required federally backed loans
Flood Insurance Cost	Premium on File median of 109 policies
Nearby Flood Policies	109 in force
Nearby Flood Claims	32 (1980–2019)
Claims Outside the SFHA	3 of 32
Most Recent Claim	Feb 2019
Claims by Event	Severe Storms, Flooding, Mudslides, And Landslides, Jan 2006 · 12 claims Severe Storms, Flooding, Mud And Landslides, Jan 1997 · 5 claims Severe Storms, Flood, Mudslides & High Tide, Jan 1982 · 6 claims

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 4131 S Castro St is moderate, ranking above 43% of the US, with a 0.07% annual chance of wildfire.

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

Wildfire Risk	Moderate above 43% of the US · lower than 74% of California
Wildfire Likelihood	0.07% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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 212 locations within half a mile, as of December 31, 2025

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

May also be available: Astound Broadband, T-Mobile, Unwired, Verizon.

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