Contra Costa County property record for 620 Mount Olivet Ct, Clayton, CA 94517
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 2.5 ba · 2,694 sqft · built 1979 |
| Lot Size | 0.243 acres (10,600 sqft) |
| Owner | Trust Name on File |
| Tax Bill | $4,570 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 119-490-047-6 |
| Primary APN | 119-490-047-6 |
|---|---|
| Alternative APN |
|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 12 Rooms |
| Stories | 1 Story |
| Building Area | 2,694 sqft Living Area |
| Gross Area | 3,232 sqft |
| 1st Floor Area | 2,694 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1979 |
|---|---|
| Effective Year Built | Effective 1985 |
| Architectural Style | Contemporary |
| Exterior Material | Wood Siding |
| Construction Type | Frame |
| Roof Material | Wood Shingle |
| Lot Area | 10,600 sqft (0.243 acres) |
| Lot Dimensions | 106 ft deep x 97 ft wide |
| Garage Type | Attached |
| Garage Area | 538 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 620 MT OLIVET CT |
|---|---|
| City | CLAYTON |
| State | CA |
| Zip | 94517-1608 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T04019 L0047 B EX MR |
| Legal Tract | 04019 |
| Legal Lot Number | 47 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 3 |
| Census Block | 3011 |
| Census Tract | 355306 |
620 Mount Olivet Ct is owner-occupied and held in a trust since August 2011.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | 620 MT OLIVET CT, CLAYTON, CA 94517-1608 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
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 | Name on Deed |
|---|---|
| Last Transfer Date | Aug 3, 2011 |
| Transfer Doc | 0000160085 |
| Record Updated | Sep 20, 2026 |
The 2025 property tax bill for 620 Mount Olivet Ct was $4,570 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 | $304,605 (+2%) Land $90,576 Building $214,029 | |
| 2025 | $4,570.00 Homeowner's exemption | $298,633 Land $88,800 Building $209,833 |
| 2023 | $4,342.00 (+1.9%) Homeowner's exemption | $287,038 Land $85,352 Building $201,686 |
| 2022 | $4,261.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 620 Mount Olivet Ct in Zone X, an area of minimal flood risk.
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 Policies | 4 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 620 Mount Olivet Ct is high, ranking above 79% of the US, with a 0.5% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | High above 79% of the US · above 56% of California |
|---|---|
| Wildfire Likelihood | 0.5% 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 | 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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