Contra Costa County property record for 109 Costanza Dr, Martinez, CA 94553
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 2,938 sqft · built 1988 |
| Lot Size | 0.769 acres (33,480 sqft) |
| Owner | Individual Name on Record |
| Last Sale | $667,500 (Dec 2012) |
| Tax Bill | $10,635 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 155-560-011-1 |
| Primary APN | 155-560-011-1 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 10 Rooms |
| Stories | 2 Stories |
| Building Area | 2,938 sqft Living Area |
| 1st Floor Area | 1,469 sqft |
| 2nd Floor Area | 1,469 sqft |
| Year Built | Built 1988 |
|---|---|
| Effective Year Built | Effective 1990 |
| Lot Area | 33,480 sqft (0.769 acres) |
| Garage Type | Attached |
| Garage Area | 690 sqft |
| Parking Spaces | 2 Parking Spaces |
| Heating System | Central |
|---|
| Street Address | 109 COSTANZA DR |
|---|---|
| City | MARTINEZ |
| State | CA |
| Zip | 94553-6625 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T6758 L20 |
| Legal Tract | 6758 |
| Legal Lot Number | 20 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 3 |
| Census Block | 3001 |
| Census Tract | 321102 |
Source: Contra Costa County records, as of October 19, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Individual Name on Record |
|---|---|
| Mailing Address | 109 COSTANZA DR, MARTINEZ, CA 94553-6625 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Dec 6, 2012 · Amount on Record |
| Deed Sale | Dec 6, 2012 · Amount on Record |
| Deed Document Number | 2012310270 |
| Prior Transfer Date | Apr 10, 2000 |
| Prior Transfer Doc | 0000072771 |
| Record Updated | Oct 29, 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 | Martinez Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $838,403 (+2%) Land $461,592 Building $376,811 | |
| 2025 | $10,635.00 (+6.46%) | $821,965 (+4.04%) Land $452,542 Building $369,423 |
| 2023 | $9,990.00 (+1.68%) | $790,049 Land $434,970 Building $355,079 |
| 2022 | $9,825.00 |
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 | 2 (1982–1995) |
| Claims Outside the SFHA | 1 of 2 |
| Most Recent Claim | Jan 1995 · Severe Winter Storms, Flooding, Landslides, Mud Flows |
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 | Moderate above 50% of the US · lower than 70% of California |
|---|---|
| Wildfire Likelihood | 0.09% annual chance |
| Exposure | None beyond 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 329 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 |
| AT&T Fixed Wireless · DSL | 100 / 20 |
May also be available: Astound Broadband, Verizon.
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