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4100 Jarosite Ct, Antioch, CA 94509 Property Records

Contra Costa County property record for 4100 Jarosite Ct, Antioch, CA 94509

Property Summary

Property TypeSingle Family Home
Details4 bd · 2.5 ba · 2,454 sqft · built 1997
Lot Size0.388 acres (16,916 sqft)
Owner2 Individual Names on Record
Last Sale$420,000 (Nov 2001)
Tax Bill$7,305 (2025)
Flood ZoneZone X (minimal risk)
APN053-520-007-5

Property Details

APN / Parcel Number

Primary APN053-520-007-5
Alternative APN
  • 053-520-007

Interior

Bedrooms4 Beds
Full Baths2.5 Baths
Half Baths1 Half Bath
Total Rooms8 Rooms
Stories2 Stories
Building Area2,454 sqft Living Area
1st Floor Area1,209 sqft
2nd Floor Area1,245 sqft

Exterior

Year BuiltBuilt 1997
Effective Year BuiltEffective 1997
Lot Area16,916 sqft (0.388 acres)
Garage TypeAttached
Garage Area599 sqft
Parking Spaces2 Parking Spaces

Location & Zoning

Street Address4100 JAROSITE CT
CityANTIOCH
StateCA
Zip94509-8941
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal DescriptionT7999 L109
Legal Tract7999
Legal Lot Number109
JurisdictionCONTRA COSTA CA
Township / Civil DivisionANTIOCH-PITTSBURG
Census Block Group3
Census Block3008
Census Tract355109

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 Record2 Individual Names on Record
Mailing Address4100 JAROSITE CT, ANTIOCH, CA 94509-8941
OccupancyOwner Occupied
Owner TypeIndividual
VestingJoint Tenants

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names2 Names on Deed
Last SaleNov 5, 2001 · Amount on Record
Deed SaleNov 5, 2001 · Amount on Record
Prior SaleOct 31, 1997 · Amount on Record
Deed Document Number2001339079
Record UpdatedOct 29, 2026

Tax Assessment & Valuation

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

Property Jurisdictions

TypeName
StateCalifornia
CountyContra Costa County
MunicipalityAntioch City
Unified School DistrictAntioch Unified School District (KG - 12)

Tax Bill & Assessment History

YearTax BillAssessed Value
2026$646,714 (+2%) Land $143,135 Building $503,579
2025$7,305.00 (+6.05%)$634,034 (+4.04%) Land $140,329 Building $493,705
2023$6,888.00 (+1.62%)$609,416 Land $134,881 Building $474,535
2022$6,778.00

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 ZoneZone X
minimal risk
Flood Insurance RequirementNot 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 RiskNot rated
no burnable land 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 SystemCITY OF ANTIOCH
serves 116,781 people · EPA ID CA0710001
Water SourceSurface water
Last State InspectionJan 2024
LeadUnder 1 ppb (2022–2024)
action level 15 ppb

Violations Reported to EPA

Water QualityNone
last 10 years
Treatment and ProcedureNone
last 10 years
Monitoring and ReportingNone
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 606 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
Xfinity
Cable		2,000 / 250
Unwired
Fixed Wireless		300 / 25
AT&T
DSL · Fiber, Fixed Wireless in parts of the area		100 / 20

May also be available: Verizon.

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