Contra Costa County property record for 811 Robinson St, Martinez, CA 94553
| Property Type | Duplex |
|---|---|
| Details | 3 bd · 2.5 ba · 1,901 sqft · built 1961 |
| Lot Size | 0.2 acres (8,700 sqft) |
| Owner | 2 Individual Names on File |
| Tax Bill | $5,333 (2025) |
| Flood Zone | Zone AO (high risk) |
| APN | 372-261-017-1 |
| Primary APN | 372-261-017-1 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 12 Rooms |
| Stories | 1 Story |
| Building Area | 1,901 sqft Living Area |
| 1st Floor Area | 1,901 sqft |
| Year Built | Built 1961 |
|---|---|
| Effective Year Built | Effective 1961 |
| Architectural Style | Duplex Single |
| Lot Area | 8,700 sqft (0.2 acres) |
| Garage Type | Attached |
| Garage Area | 370 sqft |
| Parking Spaces | 1 Parking Space |
| Street Address | 811 ROBINSON ST, 815 |
|---|---|
| City | MARTINEZ |
| State | CA |
| Zip | 94553-2554 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Legal Description | ORIG SURVEY LOT 6 & POR 5 BLK 194 |
| Legal Subdivision | MARTINEZ |
| Legal Block | 194 |
| Legal Lot Number | 6 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 2 |
| Census Block | 2024 |
| Census Tract | 317000 |
811 Robinson St is owned by two individuals who acquired it in April 2013.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 1342 CENTER AVE, MARTINEZ, CA 94553-4748 |
| Owner Type | Individual |
| Vesting | Joint Tenants |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Last Transfer Date | Apr 24, 2013 |
| Transfer Doc | 0000126296 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 811 Robinson St was $5,333.
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 | $327,131 (+2%) Land $132,617 Building $194,514 | |
| 2025 | $5,333.00 | $320,717 Land $130,017 Building $190,700 |
| 2023 | $5,098.00 (-0.04%) | $308,265 (+2%) Land $124,969 Building $183,296 |
| 2022 | $5,100.00 | $302,221 Land $122,519 Building $179,702 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 811 Robinson St in Zone AO, a high-risk flood area; flood insurance is required for federally backed loans.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone AO high risk · sheet flow 1–3 ft |
|---|---|
| 100-Year Floodplain | Yes 1% annual chance |
| Floodway | No |
| Base Flood Elevation | Varies along the reach; see FIRM |
| Flood Insurance Requirement | Required federally backed loans |
| Flood Insurance Cost | Premium on File median of 70 policies |
| Nearby Flood Policies | 70 in force |
| Nearby Flood Claims | 51 (1980–2018) |
| Claims Outside the SFHA | 1 of 51 |
| Most Recent Claim | Sep 2018 |
| Claims by Event |
|
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.
Wildfire risk around 811 Robinson St is low, with a 0.02% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 67% of the US · lower than 81% of California |
|---|---|
| Wildfire Likelihood | 0.02% 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 853 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · DSL | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Astound Broadband Fiber · Cable in parts of the area | 1,500 / 1,500 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Unwired.
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