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18844 Mount Jasper Dr, Castro Valley, CA 94552 Property Records

Alameda County property record for 18844 Mount Jasper Dr, Castro Valley, CA 94552

Property Summary

Property TypeSingle Family Home
Details4 bd · 3 ba · 2,327 sqft · built 1989
Lot Size0.117 acres (5,100 sqft)
Owner2 Individual Names on File
Last Sale$600,000 (Sep 2009)
Tax Bill$9,925 (2025)
Deeds & MortgagesNov 2020 Mortgage
Flood ZoneZone X (minimal risk)
APN85A-6408-57

Property Details

APN / Parcel Number

Primary APN85A-6408-57
Alternative APN
  • 085A-6408-057-00

Interior

Bedrooms4 Beds
Full Baths3 Baths
Total Rooms9 Rooms
Stories2 Stories
Building Area2,327 sqft Living Area
Fireplaces1 Fireplace
FireplaceFireplace

Exterior

Year BuiltBuilt 1989
Effective Year BuiltEffective 1989
Architectural StyleL-Shape
Exterior MaterialStucco
Construction TypeWood
Roof MaterialTile
Lot Area5,100 sqft (0.117 acres)

Utilities, Heating & Cooling

Heating SystemForced Air with A/C
Heating FuelGas
SewerMunicipal
Water SourceCommercial

Location & Zoning

Street Address18844 MOUNT JASPER DR
CityCASTRO VALLEY
StateCA
Zip94552-1938
Property CategoryResidential
Property TypeResidential > Single Family > Home
Local Zoning CodeR
Legal DescriptionLOT: 00068 BLK: TR: 5500
Legal Tract5500
Legal Lot Number68
JurisdictionALAMEDA CA
Township / Civil DivisionHAYWARD
Census Block Group2
Census Block2007
Census Tract430101

Owner

18844 Mount Jasper Dr is owned and occupied by two individuals who acquired it in October 2020.

Source: Alameda County records, as of August 5, 2026

Owner of Record2 Individual Names on File
Mailing Address18844 MOUNT JASPER DR, CASTRO VALLEY, CA 94552-1938
OccupancyOwner Occupied
Owner TypeIndividual
VestingCommunity Property

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

Assessor's Deed Record

Deed Names2 Names on Deed
Last SaleSep 21, 2009 · Amount on File
Deed SaleSep 21, 2009 · Amount on File
Prior SaleJul 8, 2005 · Amount on File
Deed Document Number2009301435
Last Transfer DateOct 27, 2020
Transfer Doc0000297277
Record UpdatedOct 29, 2026

November 2020: Intrafamily Transfer, Transfer

Document TypeIntrafamily Transfer
JurisdictionALAMEDA CA
Recording DateNov 4, 2020
Property Address18844 MOUNT JASPER DR, CASTRO VALLEY, CA 94552-1938
Document Number0000297277
Map ReferenceMB 160 PG 96-100
Instrument DateOct 27, 2020
Instrument2020297277
Transaction TypeTransfer
Record UpdatedAug 19, 2021
Title CompanyCHICAGO TITLE COMPANY

Transaction

Tax$0.00
Amount AccuracyTransfer Tax Exempt
Additional
  • Intrafamily Transfer

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipCommunity Property with Right of Survivorship
Address18844 MOUNT JASPER DR, CASTRO VALLEY, CA 94552-1938
InvestorPossibly a Property Investor

Mortgage

Document Number0000297278
DateNov 4, 2020
Instrument2020297278
Lender
NameQUICKEN LOANS LLC
TypeMortgage Company
Agreement
TypeConventional Mortgage
AmountAmount on Record
Term240 Months
DueNov 1, 2040

Tax Assessment & Valuation

The 2025 property tax bill for 18844 Mount Jasper Dr was $9,925 with a homeowner's exemption, up 2.3% from the year before.

Source: Alameda County assessment roll, as of August 5, 2026

Property Jurisdictions

TypeName
StateCalifornia
CountyAlameda County
Unified School DistrictCastro Valley Unified School District (KG - 12)

Tax Bill & Assessment History

YearTax BillAssessed ValueAssessed Market Value
2026$782,923 (+2.02%) Land $236,977 Building $552,946
2025$9,925.00 (+2.28%) Homeowner's exemption$767,437 Land $232,331 Building $542,106
2024$9,704.00 (+1.63%)
2023$9,548.00 Homeowner's exemption$744,371 Land $223,311 Building $521,060$1,204,740

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

FEMA maps place 18844 Mount Jasper Dr in Zone X, an area of minimal flood risk.

Source: FEMA National Flood Hazard Layer, effective May 25, 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

Wildfire risk around 18844 Mount Jasper Dr is moderate, ranking above 63% of the US, with a 0.2% annual chance of wildfire.

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

Wildfire RiskModerate
above 63% of the US · lower than 61% of California
Wildfire Likelihood0.2% annual chance
ExposureIndirect
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 SystemEAST BAY MUD
serves 1,468,000 people · EPA ID CA0110005
Water SourceSurface water
Last State InspectionDec 2021
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. This system sells water to local utilities; the supplier billing this address may be one of them.

Internet Providers

Source: FCC Broadband Data Collection, based on 495 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
Xfinity
Cable		2,000 / 250
Unwired
Fixed Wireless		300 / 25
Verizon
Fixed Wireless		300 / 20
Etheric Networks
Fixed Wireless		250 / 100
T-Mobile
Fixed Wireless		100 / 20
AT&T
DSL		100 / 20

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