Contra Costa County property record for 421 Diablo Way, Martinez, CA 94553
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,286 sqft · built 1964 |
| Lot Size | 0.164 acres (7,150 sqft) |
| Owner | Company Name on Record |
| Last Sale | $189,000 (Aug 1997) |
| Tax Bill | $4,508 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 162-323-015-6 |
| Primary APN | 162-323-015-6 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,286 sqft Living Area |
| 1st Floor Area | 1,286 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1964 |
|---|---|
| Effective Year Built | Effective 1965 |
| Architectural Style | Traditional |
| Lot Area | 7,150 sqft (0.164 acres) |
| Garage Type | Attached |
| Garage Area | 460 sqft |
| Parking Spaces | 2 Parking Spaces |
| Heating System | Forced Air with A/C |
|---|
| Street Address | 421 DIABLO WAY |
|---|---|
| City | MARTINEZ |
| State | CA |
| Zip | 94553-4830 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R7 5 |
| Legal Description | TRACT 3113 LOT 26 EX POR MR |
| Legal Subdivision | PLEASANT VIEW UNIT #1 |
| Legal Tract | 3113 |
| Legal Lot Number | 26 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 3 |
| Census Block | 3017 |
| Census Tract | 321101 |
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 | 421 DIABLO WAY, MARTINEZ, CA 94553-4830 |
| Owner Type | Company |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Aug 29, 1997 · Amount on Record |
| Deed Sale | Aug 29, 1997 · Amount on Record |
| Deed Document Number | 1997156822 |
| Last Transfer Date | Apr 20, 2004 |
| Transfer Doc | 0000151105 |
| 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 | $307,794 (+2%) Land $143,312 Building $164,482 | |
| 2025 | $4,508.00 (+5.5%) Homeowner's exemption | $301,759 (+4.04%) Land $140,502 Building $161,257 |
| 2023 | $4,273.00 (+2.45%) Homeowner's exemption | $290,045 Land $135,048 Building $154,997 |
| 2022 | $4,171.00 |
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 | 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 | 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 | 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 |
| Astound Broadband Fiber · Cable in parts of the area | 1,500 / 1,500 |
| Unwired Fixed Wireless | 300 / 25 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T DSL · Fiber in parts of the area | 100 / 20 |
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