Alameda County property record for 21487 Rizzo Ave, Castro Valley, CA 94546
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 1,118 sqft · built 1942 |
| Lot Size | 0.188 acres (8,175 sqft) |
| Owner | Individual Name on File |
| Last Sale | $450,000 (Jun 2024) |
| Tax Bill | $7,023 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 415-60-72 |
| Primary APN | 415-60-72 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 1,118 sqft Living Area |
| Year Built | Built 1942 |
|---|---|
| Effective Year Built | Effective 1942 |
| Architectural Style | Custom Design |
| Construction Type | Wood |
| Lot Area | 8,175 sqft (0.188 acres) |
| Street Address | 21487 RIZZO AVE |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-6223 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00019 BLK: TR: 0635 |
| Legal Tract | 0635 |
| Legal Block | 3 |
| Legal Lot Number | 19 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 3 |
| Census Block | 3006 |
| Census Tract | 431200 |
21487 Rizzo Ave is owned by an individual who bought it in June 2024.
Source: Alameda County records, as of August 5, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 2018 BURGESS DR, SANTA ROSA, CA 95407-4527 |
| Owner Type | Individual |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Jun 10, 2024 · Amount on File |
| Deed Sale | Jun 10, 2024 · Amount on File |
| Prior Sale | Jun 22, 2007 · Amount on File |
| Deed Document Number | 202471071 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 21487 Rizzo Ave was $7,023.
Source: Alameda County assessment roll, as of August 5, 2026
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Unified School District | Hayward Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $916,580 (+99.69%) Land $140,454 Building $776,126 | ||
| 2025 | $7,023.00 | $459,000 Land $137,700 Building $321,300 | |
| 2023 | $7,420.00 | $547,259 Land $225,342 Building $321,917 | $632,520 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 21487 Rizzo Ave in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
Source: FEMA National Flood Hazard Layer, effective May 25, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| 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 File median of 31 policies |
| Community Rating System | Class 7 (15% premium discount) |
| Nearby Flood Policies | 31 in force |
| Nearby Flood Claims | 1 (2022) |
| Most Recent Claim | Dec 2022 · Severe Winter Storms, Flooding, Landslides, And Mudslides |
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.
The area around 21487 Rizzo Ave has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
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 |
| 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.
Source: FCC Broadband Data Collection, based on 744 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Sonic Telecom Fiber | 10,000 / 10,000 |
| AT&T Fiber · Fixed Wireless, DSL in parts of the area | 5,000 / 5,000 |
| 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 |
May also be available: GeoLinks.
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