Contra Costa County property record for 20 Corwin Dr, Alamo, CA 94507
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2 ba · 2,663 sqft · built 1972 |
| Lot Size | 0.5 acres (21,780 sqft) |
| Owner | Company Name on Record |
| Tax Bill | $3,210 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 198-140-008-6 |
| Primary APN | 198-140-008-6 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 10 Rooms |
| Stories | 1 Story |
| Building Area | 2,663 sqft Living Area |
| 1st Floor Area | 2,663 sqft |
| Year Built | Built 1972 |
|---|---|
| Effective Year Built | Effective 1980 |
| Lot Area | 21,780 sqft (0.5 acres) |
| Garage Type | Attached |
| Garage Area | 660 sqft |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 20 CORWIN DR |
|---|---|
| City | ALAMO |
| State | CA |
| Zip | 94507-2104 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R20 |
| Legal Description | HEMME SUBN POR LOT 11 .50 AC |
| Legal Subdivision | HEMME SUB |
| Legal Lot Number | 11 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 2 |
| Census Block | 2003 |
| Census Tract | 345204 |
Source: Contra Costa County records, as of July 14, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Company Name on Record |
|---|---|
| Mailing Address | 20 CORWIN DR, ALAMO, CA 94507-2104 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | Name on Deed |
|---|---|
| Last Transfer Date | Oct 1, 2007 |
| Transfer Doc | 0000007484 |
| Record Updated | Sep 20, 2026 |
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Unified School District | San Ramon Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $224,117 (+2%) Land $40,564 Building $183,553 | |
| 2025 | $3,210.00 (+4.49%) Homeowner's exemption | $219,723 (+4.04%) Land $39,769 Building $179,954 |
| 2023 | $3,072.00 (+0.82%) Homeowner's exemption | $211,193 Land $38,226 Building $172,967 |
| 2022 | $3,047.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on Record median of 11 policies |
| Community Rating System | Class 6 (20% premium discount) |
| Nearby Flood Policies | 11 in force |
| Nearby Flood Claims | 5 (1993–2012) |
| Claims Outside the SFHA | 3 of 5 |
| Most Recent Claim | Dec 2012 · rainfall accumulation |
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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 52% of the US · lower than 69% of California |
|---|---|
| Wildfire Likelihood | 0.1% annual chance |
| Exposure | Direct burnable vegetation |
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 200 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · DSL | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
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