5188 Grass Valley Way, Antioch, CA 94531 Property Records

Contra Costa County property record for 5188 Grass Valley Way, Antioch, CA 94531

Property Summary

Property Type	Single Family Home
Details	3 bd · 2.5 ba · 1,697 sqft · built 1992
Lot Size	0.132 acres (5,750 sqft)
Owner	2 Individual Names on Record
Tax Bill	$3,918 (2025)
Flood Zone	Zone X (minimal risk)
APN	`056-180-003-8`

Property Details

APN / Parcel Number

Primary APN	`056-180-003-8`
Alternative APN	`056-180-003`

Interior

Bedrooms	3 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	7 Rooms
Stories	2 Stories
Building Area	1,697 sqft Living Area
1st Floor Area	869 sqft
2nd Floor Area	828 sqft

Exterior

Year Built	Built 1992
Effective Year Built	Effective 1992
Lot Area	5,750 sqft (0.132 acres)
Garage Type	Attached
Garage Area	467 sqft
Parking Spaces	2 Parking Spaces

Location & Zoning

Street Address	5188 GRASS VALLEY WAY
City	ANTIOCH
State	CA
Zip	94531-8435
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	T7587 L189
Legal Tract	7587
Legal Lot Number	189
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	EAST CONTRA COSTA
Census Block Group	1
Census Block	1008
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

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	2 Individual Names on Record
Mailing Address	5188 GRASS VALLEY WAY, ANTIOCH, CA 94531-8435
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Names on Deed
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		$314,188 (+2%) Land $90,171 Building $224,017
2025	$3,918.00 (+6.41%)	$308,028 (+4.04%) Land $88,403 Building $219,625
2023	$3,682.00 (+1.49%)	$296,069 Land $84,971 Building $211,098
2022	$3,628.00

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	Moderate above 51% of the US · lower than 70% of California
Wildfire Likelihood	0.1% 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 638 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