21724 Ada St, Hayward (Castro Valley), CA 94546 Property Records

Alameda County property record for 21724 Ada St, Hayward, CA 94546

Property Summary

Property Type	Single Family Home
Details	3 bd · 1 ba · 1,028 sqft · built 1948
Lot Size	0.114 acres (4,984 sqft)
Owner	2 Individual Names on File
Last Sale	$179,500 (Apr 1998)
Tax Bill	$4,308 (2025)
Deeds & Mortgages	Feb 2022 Reverse Mortgage
Flood Zone	Zone X (minimal risk)
APN	`415-90-93`

Property Details

APN / Parcel Number

Primary APN	`415-90-93`
Alternative APN	`415-0090-093-00`

Interior

Bedrooms	3 Beds
Full Baths	1 Bath
Total Rooms	5 Rooms
Stories	1 Story
Building Area	1,028 sqft Living Area

Exterior

Year Built	Built 1948
Effective Year Built	Effective 1948
Architectural Style	L-Shape
Construction Type	Wood
Lot Area	4,984 sqft (0.114 acres)

Location & Zoning

Street Address	21724 ADA ST
City	CASTRO VALLEY
State	CA
Zip	94546-6302
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00006 BLK: 0001 TR: 0871
Legal Subdivision	871 EDEN TOWNSHIP
Legal Tract	0871
Legal Block	1
Legal Lot Number	6
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	1
Census Block	1003
Census Tract	431200

Owner

Source: Alameda County records · APN 415-90-93

Assessment roll updated August 5, 2026 · Last verified August 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 File
Mailing Address	21724 ADA ST, CASTRO VALLEY, CA 94546-6302
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Sale	Apr 13, 1998 · Amount on Record
Deed Sale	Apr 13, 1998 · Amount on Record
Deed Document Number	1998123141
Record Updated	Sep 20, 2026

February 2022: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	21724 ADA ST, HAYWARD, CA 94546-6302
Transaction Type	Mortgage
Record Updated	Mar 09, 2022

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	21724 ADA ST, CASTRO VALLEY, CA 94546-6302

Mortgage

Document Number	0000038487
Date	Feb 18, 2022
Instrument	2022038487

Lender

Name	HIGHTECHLENDING INC
Type	Mortgage Company
Address	IRVINE, CA 92614

Agreement

Type	Reverse Mortgage
Amount	Amount Recorded

Interest

Rate Type	Adjustable Rate
Rate	2.55%
Adjustable	Adjustable Rate Rider
Type Change Date	Apr 01, 2022
Change Frequency	Monthly
Index	1-Year CMT
Max Rate	7.55%

Tax Assessment & Valuation

Source: Alameda County records · Assessment roll updated August 5, 2026 · Last verified August 2026

Property Jurisdictions

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

Tax Bill & Assessment History

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

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$285,333 (-0.44%) Land $87,781 Building $204,552
2025	$4,308.00 (+4.97%) Homeowner's exemption	$286,601 (+4.04%) Land $86,060 Building $200,541
2023	$4,104.00 Homeowner's exemption	$275,474 Land $82,719 Building $192,755	$666,540

Flood & Wildfire

Source: FEMA National Flood Hazard Layer, Alameda County (06001C), updated May 25, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060014312001, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026

Flood

FEMA Flood Zone	Zone X minimal risk
Nearest Special Flood Hazard Area	Zone AE, within 500 ft
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on Record median of 15 policies
Community Rating System	Class 7 (15% premium discount)
Nearby Flood Policies	15 in force
Nearby Flood Claims	1 (1996)
Most Recent Claim	Dec 1996 · rainfall accumulation

Wildfire

Wildfire Risk	Not rated no burnable land within ember reach

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Internet Providers

Source: FCC Broadband Data Collection, availability as of December 31, 2025 · sampled at 732 locations within half a mile · Last verified October 2026

Provider	Max Down / Up (Mbps)
AT&T Fiber · Fixed Wireless, DSL in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250
Verizon Fixed Wireless	300 / 20
Etheric Communications, LLC. Fixed Wireless	250 / 100
T-Mobile USA Fixed Wireless	100 / 20

May also be available: California Internet, Sonic Telecom, Unwired.

Drinking Water

Source: EPA Safe Drinking Water Information System via ECHO, 2026 Q3 · EPA community water system boundaries v3.0, March 2026 · Last verified October 2026

Water System	EAST BAY MUD serves 1,468,000 people
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 as reported to EPA, 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. The full violation and enforcement history is in the system's EPA record.