Alameda County property record for 20121 Edwin Markham Dr, Castro Valley, CA 94552
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 2,531 sqft · built 1991 |
| Lot Size | 0.166 acres (7,213 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $565,000 (Dec 2000) |
| Tax Bill | $10,914 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 85A-6411-37 |
| Primary APN | 85A-6411-37 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 9 Rooms |
| Stories | 2 Stories |
| Building Area | 2,531 sqft Living Area |
| Year Built | Built 1991 |
|---|---|
| Effective Year Built | Effective 1991 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 7,213 sqft (0.166 acres) |
| Street Address | 20121 EDWIN MARKHAM DR |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94552-5063 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00011 BLK: TR: 5738 |
| Legal Subdivision | TR 5738 |
| Legal Tract | 5738 |
| Legal Lot Number | 11 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 2 |
| Census Block | 2010 |
| Census Tract | 430101 |
Source: Alameda County records · APN 85A-6411-37
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 Company Names on File |
|---|---|
| Mailing Address | 13402 COLUMBIA KEY DR, TOMBALL, TX 77377-0250 |
| Owner Type | Company |
| Vesting | Trust, Family Trust |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Dec 21, 2000 · Amount on Record |
| Deed Sale | Dec 21, 2000 · Amount on Record |
| Deed Document Number | 2000372059 |
| Last Transfer Date | Oct 11, 2024 |
| Transfer Doc | 0000157366 |
| Record Updated | Sep 20, 2026 |
Source: Alameda County records · Assessment roll updated August 5, 2026 · Last verified August 2026
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Unified School District | Castro Valley Unified School District (KG - 12) |
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 | $868,325 (+2%) Land $260,497 Building $607,828 | ||
| 2025 | $10,914.00 (+3.86%) | $851,301 (+4.04%) Land $255,390 Building $595,911 | |
| 2023 | $10,508.00 | $818,248 Land $245,474 Building $572,774 | $1,274,670 |
Source: FEMA National Flood Hazard Layer as of May 25, 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Wildfire Risk | Moderate above 67% of the US · above 42% of California |
|---|---|
| Wildfire Likelihood | 0.3% annual chance |
| Exposure | Direct burnable vegetation at the parcel |
Values are read at the parcel center point; lenders make the official flood determination.
Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| Etheric Communications, LLC. Fixed Wireless | 250 / 100 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
| AT&T DSL | 100 / 20 |
Based on FCC filings for 495 locations within half a mile of this property.
Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of 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 |
| 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.
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