Contra Costa County property record for 321 Mount Washington Way, Clayton, CA 94517
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,600 sqft · built 1971 |
| Lot Size | 0.301 acres (13,130 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $1,050,000 (Oct 2021) |
| Tax Bill | $12,132 (2025) |
| Deeds & Mortgages | Oct 2021 Sale & Mortgage Mar 2020 Sale & Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 119-152-031-9 |
| Primary APN | 119-152-031-9 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 8 Rooms |
| Stories | 1 Story |
| Building Area | 1,600 sqft Living Area |
| 1st Floor Area | 1,600 sqft |
| Year Built | Built 1971 |
|---|---|
| Effective Year Built | Effective 1972 |
| Architectural Style | Cluster |
| Lot Area | 13,130 sqft (0.301 acres) |
| Garage Type | Attached |
| Garage Area | 511 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|
| Street Address | 321 MT WASHINGTON WAY |
|---|---|
| City | CLAYTON |
| State | CA |
| Zip | 94517-1545 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T04011 L0041 B EX 1/2 MR |
| Legal Subdivision | SUBDIVISION 4011 |
| Legal Tract | 04011 |
| Legal Lot Number | 41 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 4 |
| Census Block | 4004 |
| Census Tract | 355306 |
321 Mount Washington Way is owned and occupied by two individuals who bought it in October 2021.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 321 MT WASHINGTON WAY, CLAYTON, CA 94517-1545 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Community Property |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Oct 18, 2021 | Grant Deed, Transfer · Conventional Mortgage GOOGAIN INC |
| Mar 23, 2020 | Grant Deed, Transfer · Conventional Mortgage CHEVRON FCU |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Oct 18, 2021 · Amount on File |
| Deed Sale | Oct 18, 2021 · Amount on File |
| Prior Sale | Mar 23, 2020 · Amount on File |
| Deed Document Number | 2021285851 |
| Record Updated | Sep 20, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Oct 18, 2021 |
| Property Address | 321 MT WASHINGTON WAY, CLAYTON, CA 94517-1545 |
| Document Number | 0000285851 |
| Map Reference | MB 134 PG 6 |
| Instrument Date | Oct 11, 2021 |
| Instrument | 2021-285851 |
| Transaction Type | Transfer |
| Record Updated | Nov 3, 2022 |
| Title Company | CHICAGO TITLE COMPANY |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $0.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property with Right of Survivorship |
| Address | 321 MT WASHINGTON WAY, CLAYTON, CA 94517-1545 |
| Document Number | 0000285852 |
|---|---|
| Date | Oct 18, 2021 |
| Instrument | 2021-285852 |
| Name | GOOGAIN INC |
|---|---|
| Type | Mortgage Company |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Nov 1, 2051 |
| Document Number | 0000285853 |
|---|---|
| Date | Oct 18, 2021 |
| Instrument | 2021-285853 |
| Name | ALLIANT CU |
|---|---|
| Type | Credit Union |
| Address | CHICAGO, IL 60666 |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Term | 360 Months |
| Due | Oct 17, 2051 |
| Rate Type | Adjustable Rate |
|---|---|
| Change Frequency | Monthly |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Mar 23, 2020 |
| Property Address | 321 MT WASHINGTON WAY, CLAYTON, CA 94517-1545 |
| Document Number | 0000055633 |
| Map Reference | MB 134 PG 6 |
| Instrument Date | Mar 18, 2020 |
| Instrument | 2020-055633 |
| Transaction Type | Transfer |
| Record Updated | Nov 3, 2022 |
| Title Company | FIDELITY NATNL TTL CO CONCOR |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $0.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property with Right of Survivorship |
| Address | 321 MT WASHINGTON WAY, CLAYTON, CA 94517-1545 |
| Document Number | 0000055634 |
|---|---|
| Date | Mar 23, 2020 |
| Instrument | 2020-055634 |
| Name | CHEVRON FCU |
|---|---|
| Type | Credit Union |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 361 Months |
| Due | Apr 1, 2050 |
The 2025 property tax bill for 321 Mount Washington Way was $12,132 with a homeowner's exemption.
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Clayton City |
| Unified School District | Mount Diablo Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $962,000 (-2.24%) Land $467,000 Building $495,000 | |
| 2025 | $12,132.00 Homeowner's exemption | $984,000 Land $477,943 Building $506,057 |
| 2023 | $11,231.00 (-12.63%) Homeowner's exemption | $910,000 Land $442,000 Building $468,000 |
| 2022 | $12,855.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 321 Mount Washington Way in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 321 Mount Washington Way is moderate, ranking above 56% of the US, with a 0.1% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 56% of the US · lower than 66% of California |
|---|---|
| Wildfire Likelihood | 0.1% annual chance |
| Exposure | Indirect within ember reach |
| Adjoins Burnable Land | Yes |
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 420 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
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