Contra Costa County property record for 323 Roundhill Pl, Clayton, CA 94517
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 2,324 sqft · built 1976 |
| Lot Size | 0.278 acres (12,100 sqft) |
| Owner | Company Name on Record |
| Tax Bill | $6,054 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 119-392-016 |
| Primary APN | 119-392-016 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 11 Rooms |
| Stories | 2 Stories |
| Building Area | 2,324 sqft Living Area |
| Gross Area | 2,837 sqft |
| 1st Floor Area | 1,422 sqft |
| 2nd Floor Area | 902 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1976 |
|---|---|
| Effective Year Built | Effective 1987 |
| Architectural Style | Contemporary |
| Exterior Material | Stucco |
| Construction Type | Frame |
| Roof Material | Wood Shingle |
| Lot Area | 12,100 sqft (0.278 acres) |
| Garage Type | Attached |
| Garage Area | 513 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 323 ROUNDHILL PL |
|---|---|
| City | CLAYTON |
| State | CA |
| Zip | 94517-1320 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R12 |
| Legal Description | T04654 L0027 B |
| Legal Tract | 04654 |
| Legal Lot Number | 27 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 3 |
| Census Block | 3006 |
| Census Tract | 355306 |
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 | 323 ROUNDHILL PL, CLAYTON, CA 94517-1320 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | Name on Deed |
|---|---|
| Last Transfer Date | Oct 21, 1998 |
| Transfer Doc | 0000261950 |
| Record Updated | Sep 20, 2026 |
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 | $448,032 (+2%) Land $124,839 Building $323,193 | |
| 2025 | $6,054.00 (+4.94%) Homeowner's exemption | $439,248 (+4.04%) Land $122,392 Building $316,856 |
| 2023 | $5,769.00 (+1.66%) Homeowner's exemption | $422,194 Land $117,641 Building $304,553 |
| 2022 | $5,675.00 |
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 |
| 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.
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 | 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 351 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 |
May also be available: Astound Broadband, AT&T.
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