5403 Trimonti Cir, Antioch, CA 94531 Property Records

Contra Costa County property record for 5403 Trimonti Cir, Antioch, CA 94531

Property Summary

Property Type	Single Family Home
Details	4 bd · 2 ba · 1,660 sqft · built 2023
Lot Size	0.118 acres (5,117 sqft)
Owner	2 Individual Names on File
Last Sale	$691,500 (Nov 2023)
Tax Bill	$9,290 (2025)
Deeds & Mortgages	Nov 2023 Transfer Nov 2023 Sale & Mortgage
Flood Zone	Zone X (minimal risk)
APN	`057-160-096-4`

Property Details

APN / Parcel Number

Primary APN	`057-160-096-4`
Alternative APN	`057-160-096`

Interior

Bedrooms	4 Beds
Full Baths	2 Baths
Total Rooms	7 Rooms
Stories	1 Story
Building Area	1,660 sqft Living Area
1st Floor Area	1,660 sqft

Exterior

Year Built	Built 2023
Effective Year Built	Effective 2023
Lot Area	5,117 sqft (0.118 acres)
Garage Type	Attached
Garage Area	459 sqft
Parking Spaces	2 Parking Spaces

Location & Zoning

Street Address	5403 TRIMONTI CIR
City	ANTIOCH
State	CA
Zip	94531-5001
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	T9489 L468
Legal Subdivision	AVIANO SUB 9489 PH 3
Legal Tract	9489
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	EAST CONTRA COSTA
Census Block Group	2
Census Block	2016
Census Tract	303207

Historic Designation

Source: NPS National Register of Historic Places, as of August 1, 2026

Historic District	Within the Shannon-Williamson Ranch listed 1987 · 12 contributing resources · NRIS 87000003

Federal listing alone does not restrict alterations; local historic district rules, which this data does not cover, may apply.

Owner

5403 Trimonti Cir is owned and occupied by two individuals who bought it in November 2023.

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

Owner of Record	2 Individual Names on File
Mailing Address	5403 TRIMONTI CIR, ANTIOCH, CA 94531-5001
Occupancy	Owner Occupied
Owner Type	Individual

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
Nov 7, 2023	Intrafamily Transfer, Transfer FIRST AMERICAN TITLE HSD, FIRST AMERICAN TITLE CO HSD
Nov 7, 2023	Grant Deed, Transfer · Conventional Mortgage US BANK NA

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Nov 7, 2023 · Amount on File
Deed Sale	Nov 7, 2023 · Amount on File
Deed Document Number	2023119792
Prior Transfer Date	Nov 3, 2023
Prior Transfer Doc	0000119793
Record Updated	Sep 20, 2026

November 2023: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	CONTRA COSTA CA
Recording Date	Nov 7, 2023
Property Address	5403 TRIMONTI CIR, ANTIOCH, CA 94531-5001
Document Number	0000119793
Map Reference	MB 546 PG 9-25
Instrument Date	Nov 3, 2023
Instrument	2023-119793
Transaction Type	Transfer
Record Updated	Nov 16, 2023
Title Company	FIRST AMERICAN TITLE HSD, FIRST AMERICAN TITLE CO HSD

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
Address	5403 TRIMONTI CIR, ANTIOCH, CA 94531-5001

November 2023: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Nov 7, 2023
Property Address	5403 TRIMONTI CIR, ANTIOCH, CA 94531-5001
Document Number	0000119792
Map Reference	MB 546 PG 9-25
Instrument Date	Oct 30, 2023
Instrument	2023-119792
Transaction Type	Transfer
Record Updated	Nov 16, 2023
Title Company	FIRST AMERICAN TITLE COMPANY HOMEBU, FIRST AMER TTL CO HOMEBUILDE

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$0.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	5403 TRIMONTI CIR, ANTIOCH, CA 94531-5001
Investor	Possibly a Property Investor

Mortgage

Document Number	0000119794
Date	Nov 7, 2023
Instrument	2023-119794

Lender

Name	US BANK NA
Type	Bank

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Dec 1, 2053

Interest

Rate Type	Adjustable Rate
Rate	6.5%
Type Change Date	Dec 1, 2030
Change Frequency	6 Months
Min Rate At Change	2.75%
Max Rate At Change	11%
Max Rate	11%

Tax Assessment & Valuation

The 2025 property tax bill for 5403 Trimonti Cir was $9,290 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	Antioch City
Unified School District	Antioch Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$719,332 (+2%) Land $228,888 Building $490,444
2025	$9,290.00 Homeowner's exemption	$705,228 Land $224,400 Building $480,828
2023	$1,390.00 (+7.01%)	$132,175 Land $132,175
2022	$1,299.00

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

FEMA maps place 5403 Trimonti Cir in Zone X, an area of minimal flood risk.

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

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it
Nearby Flood Policies	2 in force

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 5403 Trimonti Cir is high, ranking above 78% of the US, with a 0.5% annual chance of wildfire.

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

Wildfire Risk	High above 78% of the US · above 55% of California
Wildfire Likelihood	0.5% annual chance
Exposure	Direct burnable vegetation

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

Provider	Max Down / Up (Mbps)
AT&T Fiber	5,000 / 5,000
Xfinity Cable	2,000 / 250
Unwired Fixed Wireless	300 / 25

May also be available: Verizon.

Cell Coverage

5G (outdoors only) and 4G LTE

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