Contra Costa County property record for 557 William Way, Martinez, CA 94553
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 2,815 sqft · built 2022 |
| Lot Size | 0.191 acres (8,306 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $1,507,000 (Sep 2023) |
| Tax Bill | $21,870 (2025) |
| Deeds & Mortgages | Sep 2023 Transfer Sep 2023 Sale & Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 162-580-045-1 |
| Primary APN | 162-580-045-1 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 9 Rooms |
| Stories | 2 Stories |
| Building Area | 2,815 sqft Living Area |
| 1st Floor Area | 1,432 sqft |
| 2nd Floor Area | 1,383 sqft |
| Year Built | Built 2022 |
|---|---|
| Effective Year Built | Effective 2022 |
| Lot Area | 8,306 sqft (0.191 acres) |
| Garage Type | Attached |
| Garage Area | 469 sqft |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 557 WILLIAM WAY |
|---|---|
| City | MARTINEZ |
| State | CA |
| Zip | 94553-4764 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T9358 L45 |
| Legal Subdivision | TRADITIONS/THE MDW SUB 9358 |
| Legal Tract | 9358 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 3 |
| Census Block | 3014 |
| Census Tract | 321101 |
Source: Contra Costa County assessment roll, 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 | 2 Company Names on File |
|---|---|
| Mailing Address | PO BOX 23868, PLEASANT HILL, CA 94523-0868 |
| Owner Type | Company |
| Vesting | Trust, Family Trust |
| Date | Document |
|---|---|
| Sep 29, 2023 | Intrafamily Transfer, Transfer OLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY |
| Sep 29, 2023 | Grant Deed, Transfer · Conventional Mortgage US BANK NA |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Sep 29, 2023 · Amount on Record |
| Deed Sale | Sep 29, 2023 · Amount on Record |
| Deed Document Number | 202394619 |
| Prior Transfer Date | Sep 8, 2023 |
| Prior Transfer Doc | 0000094620 |
| Record Updated | Sep 20, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Sep 29, 2023 |
| Property Address | 557 WILLIAM WAY, MARTINEZ, CA 94553-4764 |
| Document Number | 0000094620 |
| Map Reference | MB 548 PG 21 |
| Instrument Date | Sep 8, 2023 |
| Instrument | 2023-094620 |
| Transaction Type | Transfer |
| Record Updated | Oct 10, 2023 |
| Title Company | OLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | PO BOX 23868, PLEASANT HILL, CA 94523-0868 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | CONTRA COSTA CA |
| Recording Date | Sep 29, 2023 |
| Property Address | 557 WILLIAM WAY, MARTINEZ, CA 94553-4764 |
| Document Number | 0000094619 |
| Map Reference | MB 548 PG 21 |
| Instrument Date | Sep 5, 2023 |
| Instrument | 2023-094619 |
| Transaction Type | Transfer |
| Record Updated | Oct 10, 2023 |
| Title Company | OLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY |
| Amount | Amount Recorded |
|---|---|
| Downpayment | Downpayment on File |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $0.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | PO BOX 23868, PLEASANT HILL, CA 94523-0868 |
| Document Number | 0000094621 |
|---|---|
| Date | Sep 29, 2023 |
| Instrument | 2023-094621 |
| Name | US BANK NA |
|---|---|
| Type | Bank |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Oct 1, 2053 |
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 | $1,567,778 (+2%) Land $833,256 Building $734,522 | |
| 2025 | $21,870.00 (+89.98%) | $1,537,038 (+104.26%) Land $816,918 Building $720,120 |
| 2023 | $11,512.00 (+520.93%) | $752,479 Land $215,377 Building $537,102 |
| 2022 | $1,854.00 |
Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.
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 | 1 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 | Low lower than 95% of the US · lower than 97% of California |
|---|---|
| Wildfire Likelihood | 0.02% annual chance |
| Exposure | None beyond ember reach |
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | CITY OF MARTINEZ serves 31,015 people · EPA ID CA0710006 |
|---|---|
| Water Source | Purchased surface water from CONTRA COSTA WATER DISTRICT |
| Last State Inspection | Oct 2025 |
| Lead | Under 1 ppb (2023–2025) 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 528 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Radiate Holdings Fiber · Cable in parts of the area | 1,500 / 1,500 |
| Unwired Fixed Wireless | 300 / 25 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
| AT&T DSL · Fiber in parts of the area | 100 / 20 |
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