Contra Costa County property record for 123 Williamson Ct, Martinez, CA 94553
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 1,943 sqft · built 1997 |
| Lot Size | 0.119 acres (5,200 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $860,000 (Jul 2025) |
| Tax Bill | $7,229 (2025) |
| Deeds & Mortgages | May 2019 Loan Modification |
| Flood Zone | Zone X (minimal risk) |
| APN | 161-291-018 |
| Primary APN | 161-291-018 |
|---|---|
| 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 1997 |
|---|---|
| Effective Year Built | Effective 1997 |
| Lot Area | 5,200 sqft (0.119 acres) |
| Garage Type | Attached |
| Garage Area | 462 sqft |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 123 WILLIAMSON CT |
|---|---|
| City | MARTINEZ |
| State | CA |
| Zip | 94553-6850 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T7586 L11 |
| Legal Subdivision | SUBDIVISION 7586 |
| Legal Tract | 7586 |
| Legal Lot Number | 11 |
| 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 · APN 161-291-018
Assessment roll updated July 14, 2026 · Last verified July 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 123 WILLIAMSON CT, MARTINEZ, CA 94553-6850 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Community Property |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Jul 31, 2025 · Amount on Record |
| Deed Sale | Jul 31, 2025 · Amount on Record |
| Prior Sale | Mar 31, 2000 · Amount on Record |
| Deed Document Number | 202576782 |
| Prior Transfer Date | May 23, 2001 |
| Prior Transfer Doc | 0000145449 |
| Record Updated | Sep 20, 2026 |
| Document Type | Loan Modification |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Property Address | 123 WILLIAMSON CT, MARTINEZ, CA 94553-6850 |
| Document Number | 0000090167 |
| Instrument Date | May 24, 2019 |
| Transaction Type | Mortgage |
| Record Updated | Jul 01, 2019 |
| Title Company | NOT AVAILABLE |
| Name | Verified Name |
|---|---|
| Relationship | Husband and Wife |
| Address | 123 WILLIAMSON CT MARTINEZ CA 945536850, MARTINEZ, CA 94553-6850 |
| Document Number | 0000090167 |
|---|---|
| Date | Jun 14, 2019 |
| Instrument | 90167 |
| Name | JP MORGAN CHASE BK |
|---|---|
| Type | Bank |
| Address | COLUMBUS, OH 43219-6009 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 480 Months |
| Due | Jun 13, 2059 |
| Rate | 2.97% |
|---|
Source: Contra Costa County records · Assessment roll updated July 14, 2026 · Last verified July 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Martinez City |
| Unified School District | Mount Diablo Unified School District (KG - 12) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $860,000 (+69.82%) Land $450,000 Building $410,000 | |
| 2025 | $7,229.00 (+4.63%) Homeowner's exemption | $506,413 (+4.04%) Land $122,947 Building $383,466 |
| 2023 | $6,909.00 (+1.77%) Homeowner's exemption | $486,751 Land $118,174 Building $368,577 |
| 2022 | $6,789.00 |
Source: FEMA National Flood Hazard Layer as of October 12, 2026 · FEMA NFIP claims and policies as of September 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 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 |
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
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: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
May also be available: AT&T, Radiate Holdings, Verizon.
Based on FCC filings for 454 locations within half a mile of this property.
Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | CONTRA COSTA WATER DISTRICT serves 210,500 people |
|---|---|
| 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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.
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