Alameda County property record for 18775 Madison Ave, Castro Valley, CA 94546
| Property Type | Single Family Home |
|---|---|
| Details | 6 bd · 2.5 ba · 2,095 sqft · built 1952 |
| Lot Size | 0.125 acres (5,445 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $585,000 (Mar 2004) |
| Tax Bill | $10,592 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 84C-865-23-5 |
| Primary APN | 84C-865-23-5 |
|---|---|
| Alternative APN |
|
| Bedrooms | 6 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 9 Rooms |
| Stories | 2 Stories |
| Building Area | 2,095 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1952 |
|---|---|
| Effective Year Built | Effective 1953 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 5,445 sqft (0.125 acres) |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 18775 MADISON AVE |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-2543 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00023 BLK: 0007 TR: 0863 ;LOT: 00024 BLK: 0007 TR: 0863 |
| Legal Tract | 0863 |
| Legal Block | 7 |
| Legal Lot Number | 23,24 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 4 |
| Census Block | 4011 |
| Census Tract | 430200 |
18775 Madison Ave is owned and occupied by two individuals who bought it in March 2004.
Source: Alameda County records, as of August 5, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 18775 MADISON AVE, CASTRO VALLEY, CA 94546-2543 |
| Occupancy | Owner Occupied |
| 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 | 2 Names on Deed |
|---|---|
| Last Sale | Mar 3, 2004 · Amount on File |
| Deed Sale | Mar 3, 2004 · Amount on File |
| Prior Sale | Jul 20, 1999 · Amount on File |
| Deed Document Number | 200490700 |
| Prior Transfer Date | Apr 2, 2003 |
| Prior Transfer Doc | 0000212405 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 18775 Madison Ave was $10,592 with a homeowner's exemption.
Source: Alameda County assessment roll, as of August 5, 2026
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Unified School District | Castro Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $840,606 (+1.16%) Land $254,282 Building $593,324 | ||
| 2025 | $10,592.00 Homeowner's exemption | $830,988 Land $249,296 Building $581,692 | |
| 2023 | $10,193.00 Homeowner's exemption | $798,724 Land $239,617 Building $559,107 | $1,250,640 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 18775 Madison Ave in Zone X, an area of minimal flood risk, within 100 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 100 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 7 (15% premium discount) |
| Nearby Flood Policies | 1 in force |
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.
Wildfire risk around 18775 Madison Ave is low, with a 0.02% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 0.02% annual chance |
| Exposure | Indirect 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 412 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 · DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
May also be available: Etheric Networks, T-Mobile.
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