4123 Mt Isabel Rd, Antioch, CA 94531 Property Records

Contra Costa County property record for 4123 Mt Isabel Rd, Antioch, CA 94531

Property Summary

Property Type	Single Family Home
Details	4 bd · 2.5 ba · 2,085 sqft · built 2001
Lot Size	0.112 acres (4,868 sqft)
Owner	2 Individual Names on File
Tax Bill	$4,831 (2025)
Deeds & Mortgages	Nov 2021 Mortgage
Flood Zone	Zone X (minimal risk)
APN	`055-650-014-8`

Property Details

APN / Parcel Number

Primary APN	`055-650-014-8`
Alternative APN	`055-650-014`

Interior

Bedrooms	4 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	9 Rooms
Stories	2 Stories
Building Area	2,085 sqft Living Area
1st Floor Area	1,102 sqft
2nd Floor Area	983 sqft

Exterior

Year Built	Built 2001
Effective Year Built	Effective 2001
Lot Area	4,868 sqft (0.112 acres)
Garage Type	Attached
Garage Area	472 sqft
Parking Spaces	2 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central

Location & Zoning

Street Address	4123 MOUNT ISABEL RD
City	ANTIOCH
State	CA
Zip	94531-9107
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	T8410 L89
Legal Subdivision	SUBDIVISION 8410
Legal Tract	8410
Legal Lot Number	89
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	TASSAJARA
Census Block Group	1
Census Block	1002
Census Tract	355118

Owner

4123 Mt Isabel Rd is owned and occupied by two individuals who acquired it in September 2012.

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

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

Owner of Record	2 Individual Names on File
Mailing Address	4123 MOUNT ISABEL RD, ANTIOCH, CA 94531-9107
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Tenants in Common

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Sep 13, 2012
Deed Sale	Sep 13, 2012
Prior Sale	Oct 28, 2009
Deed Document Number	2012223415
Prior Transfer Date	Sep 7, 2012
Prior Transfer Doc	0000223415
Record Updated	Oct 29, 2026

November 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	4123 MOUNT ISABEL RD, ANTIOCH, CA 94531-9107
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	FIDELITY NATIONAL TITLE CO

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	4123 MOUNT ISABEL RD, ANTIOCH, CA 94531-9107

Mortgage

Document Number	0000318660
Date	Nov 17, 2021
Instrument	2021-318660

Lender

Name	ROCKET MORTGAGE LLC
Type	Mortgage Company
Address	DETROIT, MI 48226

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	181 Months
Due	Dec 1, 2036

Tax Assessment & Valuation

The 2025 property tax bill for 4123 Mt Isabel Rd was $4,831.

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

Property Jurisdictions

Type	Name
State	California
County	Contra Costa County
Municipality	Antioch City
Unified School District	Antioch Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$400,579 (+2%) Land $133,969 Building $266,610
2025	$4,831.00	$392,726 Land $131,343 Building $261,383
2023	$4,548.00 (+1.52%)	$377,478 Land $126,244 Building $251,234
2022	$4,480.00

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

Flood

FEMA maps place 4123 Mt Isabel Rd in Zone X, an area of minimal flood risk.

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

Wildfire risk around 4123 Mt Isabel Rd is low, with a 0.04% annual chance of wildfire.

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

Wildfire Risk	Low lower than 67% of the US · lower than 81% of California
Wildfire Likelihood	0.04% annual chance
Exposure	Indirect within 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 ANTIOCH serves 116,781 people · EPA ID CA0710001
Water Source	Surface water
Last State Inspection	Jan 2024
Lead	Under 1 ppb (2022–2024) 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 675 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
AT&T Fiber · DSL in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250

May also be available: Unwired.

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