Contra Costa County property record for 1635 1st Ave, Walnut Creek, CA 94597
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 2,164 sqft · built 2021 |
| Lot Size | 0.135 acres (5,924 sqft) |
| Owner | 2 Individual Names on File |
| Tax Bill | $11,820 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 171-091-058-7 |
| Primary APN | 171-091-058-7 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 10 Rooms |
| Stories | 2 Stories |
| Building Area | 2,164 sqft Living Area |
| 1st Floor Area | 942 sqft |
| 2nd Floor Area | 1,222 sqft |
| Year Built | Built 2021 |
|---|---|
| Effective Year Built | Effective 2022 |
| Lot Area | 5,924 sqft (0.135 acres) |
| Garage Area | 424 sqft |
| Parking Spaces | 2 Parking Spaces |
| Account Number | 171-091-058-7 |
|---|---|
| Street Address | 1635 1ST AVE |
| City | WALNUT CREEK |
| State | CA |
| Zip | 94597-2534 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T219PM26 PCL A |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 2 |
| Census Block | 2011 |
| Census Tract | 340001 |
1635 1st Ave is owned and occupied by two individuals.
Source: Contra Costa County records, as of September 29, 2025
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 1631 1ST AVE, WALNUT CREEK, CA 94597-2534 |
| 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 |
|---|---|
| Record Updated | Jun 8, 2026 |
The 2025 property tax bill for 1635 1st Ave was $11,820.
Source: Contra Costa County assessment roll, as of July 1, 2025
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Walnut Creek City |
| Unified School District | Mount Diablo Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2025 | $11,820.00 | $960,778 Land $345,278 Building $615,500 |
| 2023 | $11,378.00 | $923,471 Land $331,871 Building $591,600 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 1635 1st Ave in Zone X, an area of minimal flood risk, though there have been 2 flood claims nearby since 1998.
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 |
| Nearby Flood Claims | 2 (1998–2012) |
| Claims Outside the SFHA | 2 of 2 |
| Most Recent Claim | Nov 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.
Wildfire risk around 1635 1st Ave is low, with less than a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 99.1% of the US · lower than 99.2% of California |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | None beyond 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 | CONTRA COSTA WATER DISTRICT serves 210,500 people · EPA ID CA0710003 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jan 2022 |
| Lead | Under 1 ppb (2026–2028) 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.
Source: FCC Broadband Data Collection, based on 520 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · DSL · Fixed Wireless in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Astound Broadband Cable · Fiber in parts of the area | 1,500 / 50 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Sonic Telecom.
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