309 Robert St, Antioch, CA 94509 Property Records

Contra Costa County property record for 309 Robert St, Antioch, CA 94509

Property Summary

Property Type	Single Family Home
Details	3 bd · 1 ba · 961 sqft · built 1955
Lot Size	0.126 acres (5,500 sqft)
Owner	Individual Name on Record
Last Sale	$119,000 (Dec 2009)
Tax Bill	$2,215 (2025)
Flood Zone	Zone X (minimal risk)
APN	`071-094-021-4`

Property Details

APN / Parcel Number

Primary APN	`071-094-021-4`
Alternative APN	`071-094-021`

Interior

Bedrooms	3 Beds
Full Baths	1 Bath
Total Rooms	5 Rooms
Stories	1 Story
Building Area	961 sqft Living Area
1st Floor Area	961 sqft

Exterior

Year Built	Built 1955
Effective Year Built	Effective 1955
Lot Area	5,500 sqft (0.126 acres)
Garage Type	Attached
Garage Area	240 sqft
Parking Spaces	1 Parking Space

Location & Zoning

Street Address	309 ROBERT ST
City	ANTIOCH
State	CA
Zip	94509-4869
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	TRACT 2076 LOT 85
Legal Subdivision	HIGHLANDS TERRACE #2
Legal Tract	2076
Legal Lot Number	85
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	ANTIOCH-PITTSBURG
Census Block Group	1
Census Block	1001
Census Tract	307101

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 ROBERT ST, ANTIOCH, CA 94509-4869
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Single Person

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Dec 31, 2009 · Amount on Record
Deed Sale	Dec 31, 2009 · Amount on Record
Prior Sale	Jun 19, 2008 · Amount on Record
Deed Document Number	2009305915
Prior Transfer Date	Dec 16, 2004
Prior Transfer Doc	0000497823
Record Updated	Sep 20, 2026

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	Antioch City
Unified School District	Antioch Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$156,663 (+2%) Land $52,659 Building $104,004
2025	$2,215.00 (+6.54%) Homeowner's exemption	$153,592 (+4.04%) Land $51,627 Building $101,965
2023	$2,079.00 (+1.41%) Homeowner's exemption	$147,629 Land $49,623 Building $98,006
2022	$2,050.00

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

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

Provider	Max Down / Up (Mbps)
AT&T Fiber · DSL	5,000 / 5,000
Xfinity Cable	2,000 / 250
Unwired Fixed Wireless	300 / 25
Verizon Fixed Wireless	300 / 20