Contra Costa County property record for 118 Williamson Ct, Martinez, CA 94553
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 1,943 sqft · built 1995 |
| Lot Size | 0.11 acres (4,800 sqft) |
| Owner | Company Name on Record |
| Last Sale | $200,000 (Apr 1996) |
| Tax Bill | $5,320 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 161-291-012-3 |
| Primary APN | 161-291-012-3 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 9 Rooms |
| Stories | 2 Stories |
| Building Area | 1,943 sqft Living Area |
| 1st Floor Area | 764 sqft |
| 2nd Floor Area | 1,179 sqft |
| Year Built | Built 1995 |
|---|---|
| Effective Year Built | Effective 1995 |
| Lot Area | 4,800 sqft (0.11 acres) |
| Garage Type | Attached |
| Garage Area | 462 sqft |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 118 WILLIAMSON CT |
|---|---|
| City | MARTINEZ |
| State | CA |
| Zip | 94553-4194 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T7586 L5 |
| Legal Subdivision | CREEKSIDE COLLECTION AT SHADOWBROOK |
| Legal Tract | 7586 |
| Legal Lot Number | 5 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 3 |
| Census Block | 3005 |
| Census Tract | 320004 |
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 | 118 WILLIAMSON CT, MARTINEZ, CA 94553-4194 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Apr 3, 1996 · Amount on Record |
| Deed Sale | Apr 3, 1996 · Amount on Record |
| Deed Document Number | 199660667 |
| Last Transfer Date | Nov 12, 2010 |
| Transfer Doc | 0000268159 |
| 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 | Martinez City |
| Unified School District | Mount Diablo Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $343,327 (+2%) Land $110,126 Building $233,201 | |
| 2025 | $5,320.00 (+4.93%) Homeowner's exemption | $336,596 (+4.04%) Land $107,967 Building $228,629 |
| 2023 | $5,070.00 (+2.11%) Homeowner's exemption | $323,527 Land $103,775 Building $219,752 |
| 2022 | $4,965.00 |
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 Claims | 1 (1979) |
| Most Recent Claim | Oct 1979 · 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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land 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 454 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 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Astound Broadband, AT&T, Verizon.
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