Contra Costa County property record for 3800 Arthur Rd, Martinez, CA 94553
| Property Type | Federal Property (Exempt) |
|---|---|
| Details | 5,637 sqft · built 2001 |
| Lot Size | 4.55 acres (198,198 sqft) |
| Owner | Company Name on Record |
| Flood Zone | Zone X (minimal risk) |
| APN | 378-140-010 |
| Primary APN | 378-140-010 |
|---|---|
| Alternative APN |
|
| Stories | 1 Story |
|---|---|
| Building Area | 5,637 sqft Gross Area |
| 1st Floor Area | 5,637 sqft |
| Year Built | Built 2001 |
|---|---|
| Effective Year Built | Effective 2002 |
| Lot Area | 198,198 sqft |
| Street Address | 3800 ARTHUR RD |
|---|---|
| City | MARTINEZ |
| State | CA |
| Zip | 94553-1463 |
| Property Category | Public Works |
| Property Type | Public Works > Federal Property (Exempt) |
| Local Zoning Code | HI |
| Legal Description | POR RO LAS JUNTAS EX MR |
| Legal Subdivision | LAS JUNTAS RHO |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | CENTRAL CONTRA COSTA |
| Census Block Group | 1 |
| Census Block | 1030 |
| Census Tract | 320001 |
Source: Contra Costa County records, as of July 14, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | Company Name on Record |
|---|---|
| Mailing Address | 3800 ARTHUR RD, MARTINEZ, CA 94553-1463 |
| Owner Type | Company |
| Vesting | Company |
| Deed Names | Name on Deed |
|---|---|
| Record Updated | Sep 20, 2026 |
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Unified School District | Martinez Unified School District (KG - 12) |
| Year | Assessed Value |
|---|---|
| 2026 | $6,842,978 (+6.12%) Land $2,854,252 Building $3,988,726 |
| 2023 | $6,448,294 Land $2,689,627 Building $3,758,667 |
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 |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 6 (20% premium discount) |
| Nearby Flood Policies | 2 in force |
| Nearby Flood Claims | 1 (1998) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Jan 1998 · rainfall accumulation |
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 | CONTRA COSTA WATER DISTRICT serves 210,500 people · EPA ID CA0710003 |
|---|---|
| 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, 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 4 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
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