20321 Sapphire St, Castro Valley, CA 94546 Property Records

Alameda County property record for 20321 Sapphire St, Castro Valley, CA 94546

Property Summary

Property Type	Single Family Home
Details	3 bd · 1 ba · 1,106 sqft · built 1952
Lot Size	0.118 acres (5,126 sqft)
Owner	Individual Name on Record
Tax Bill	$3,038 (2025)
Flood Zone	Zone X (minimal risk)
APN	`84C-1064-40`

Property Details

APN / Parcel Number

Primary APN	`84C-1064-40`
Alternative APN	`084C-1064-040-00`

Interior

Bedrooms	3 Beds
Full Baths	1 Bath
Total Rooms	5 Rooms
Stories	1 Story
Building Area	1,106 sqft Living Area

Exterior

Year Built	Built 1952
Effective Year Built	Effective 1953
Architectural Style	L-Shape
Exterior Material	Stucco
Construction Type	Wood
Roof Material	Composition Shingle
Lot Area	5,126 sqft (0.118 acres)
Lot Dimensions	95 ft deep x 54 ft wide

Utilities, Heating & Cooling

Water Source	Commercial

Location & Zoning

Street Address	20321 SAPPHIRE ST
City	CASTRO VALLEY
State	CA
Zip	94546-4729
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00011 BLK: 0003 TR: 1191
Legal Subdivision	TRACT 1191
Legal Tract	1191
Legal Block	3
Legal Lot Number	11
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	3
Census Block	3004
Census Tract	430800

Owner

Source: Alameda County records, as of August 5, 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	10 ENTRANCE WAY, WOODSIDE, CA 94062-4202
Owner Type	Individual

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Name on Deed
Last Transfer Date	Feb 23, 2016
Transfer Doc	0000049698
Record Updated	Sep 20, 2026

Tax Assessment & Valuation

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

Property Jurisdictions

Type	Name
State	California
County	Alameda County
Unified School District	Castro Valley Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$187,486 (+2%) Land $87,625 Building $99,861
2025	$3,038.00 (+5.05%)	$183,810 (+4.04%) Land $85,907 Building $97,903
2023	$2,892.00	$176,673 Land $82,571 Building $94,102	$888,660

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

Flood

Source: FEMA National Flood Hazard Layer, effective May 25, 2026

FEMA Flood Zone	Zone X minimal risk
Nearest Special Flood Hazard Area	Zone A, within 500 ft
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 66% of the US · lower than 80% of California
Wildfire Likelihood	0.02% annual chance
Exposure	None beyond 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	EAST BAY MUD serves 1,468,000 people · EPA ID CA0110005
Water Source	Surface water
Last State Inspection	Dec 2021
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. 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 442 locations within half a mile, as of December 31, 2025

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

May also be available: Etheric Networks, GeoLinks, Sonic Telecom, T-Mobile, Unwired.