Contra Costa County property record for 315 Semillon Cir, Clayton, CA 94517
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2.5 ba · 2,375 sqft · built 1978 |
| Lot Size | 0.297 acres (12,915 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $788,000 (Dec 2015) |
| Tax Bill | $8,931 (2025) |
| Deeds & Mortgages | Mar 2026 Transfer Mar 2021 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 119-554-003-2 |
| Primary APN | 119-554-003-2 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 10 Rooms |
| Stories | 1 Story |
| Building Area | 2,375 sqft Living Area |
| 1st Floor Area | 2,375 sqft |
| Year Built | Built 1978 |
|---|---|
| Effective Year Built | Effective 1990 |
| Lot Area | 12,915 sqft (0.297 acres) |
| Garage Type | Attached |
| Garage Area | 440 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|
| Street Address | 315 SEMILLON CIR |
|---|---|
| City | CLAYTON |
| State | CA |
| Zip | 94517-1419 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R12 |
| Legal Description | T04805 L0019 B |
| Legal Subdivision | SUBDIVISION 4805 |
| Legal Tract | 04805 |
| Legal Lot Number | 19 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 1 |
| Census Block | 1011 |
| Census Tract | 355308 |
315 Semillon Cir is owner-occupied and held in a trust since December 2015.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 315 SEMILLON CIR, CLAYTON, CA 94517-1419 |
| 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.
| Date | Document |
|---|---|
| Mar 11, 2026 | Intrafamily Transfer, Transfer |
| Mar 19, 2021 | Deed of Trust, Mortgage · Conventional Mortgage COMMERCE HOME MORTGAGE LLC |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Dec 11, 2015 · Amount on File |
| Deed Sale | Dec 11, 2015 · Amount on File |
| Deed Document Number | 2015255171 |
| Prior Transfer Date | May 7, 2010 |
| Prior Transfer Doc | 0000097755 |
| Record Updated | Oct 29, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Mar 11, 2026 |
| Property Address | 315 SEMILLON CIR, CLAYTON, CA 94517-1419 |
| Document Number | 0000023788 |
| Map Reference | MB 206 PG 17 |
| Instrument Date | Mar 3, 2026 |
| Instrument | 2026- 023788 |
| Transaction Type | Transfer |
| Record Updated | Mar 20, 2026 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | No Consideration Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 315 SEMILLON CIR, CLAYTON, CA 94517-1419 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Property Address | 315 SEMILLON CIR, CLAYTON, CA 94517-1419 |
| Transaction Type | Mortgage |
| Record Updated | Nov 3, 2022 |
| Title Company | OLD REPUBLIC TITLE SF |
| Name | Verified Name |
|---|---|
| Address | 315 SEMILLON CIR, CLAYTON, CA 94517-1419 |
| Document Number | 0000084232 |
|---|---|
| Date | Mar 19, 2021 |
| Instrument | 2021-084232 |
| Name | COMMERCE HOME MORTGAGE LLC |
|---|---|
| Type | Mortgage Company |
| Address | OAKLAND, CA 94623 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 181 Months |
| Due | Apr 1, 2036 |
The 2025 property tax bill for 315 Semillon Cir was $8,931.
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 | $707,639 (+2%) Land $377,168 Building $330,471 | |
| 2025 | $8,931.00 Homeowner's exemption | $693,765 Land $369,773 Building $323,992 |
| 2023 | $8,543.00 (+1.39%) Homeowner's exemption | $666,827 Land $355,415 Building $311,412 |
| 2022 | $8,426.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 315 Semillon Cir in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
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 |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| 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 315 Semillon Cir is moderate, ranking above 47% of the US, with a 0.09% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 47% of the US · lower than 72% of California |
|---|---|
| Wildfire Likelihood | 0.09% annual chance |
| Exposure | Indirect within 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 253 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: AT&T.
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