Contra Costa County property record for 12 Diane Ct, Oakley, CA 94561
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,987 sqft · built 2004 |
| Lot Size | 0.164 acres (7,158 sqft) |
| Owner | Company Name on File |
| Last Sale | $450,500 (Jan 2005) |
| Tax Bill | $9,953 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 033-070-126-9 |
| Primary APN | 033-070-126-9 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 7 Rooms |
| Stories | 1 Story |
| Building Area | 1,987 sqft Living Area |
| 1st Floor Area | 1,987 sqft |
| Year Built | Built 2004 |
|---|---|
| Effective Year Built | Effective 2005 |
| Lot Area | 7,158 sqft (0.164 acres) |
| Garage Type | Attached |
| Garage Area | 420 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|
| Street Address | 12 DIANE CT |
|---|---|
| City | OAKLEY |
| State | CA |
| Zip | 94561-2786 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T8765 L9 |
| Legal Tract | 8765 |
| Legal Lot Number | 9 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | EAST CONTRA COSTA |
| Census Block Group | 1 |
| Census Block | 1004 |
| Census Tract | 302012 |
Source: Contra Costa County records · APN 033-070-126-9
Assessment roll updated July 14, 2026 · Last verified July 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 File |
|---|---|
| Mailing Address | 12 DIANE CT, OAKLEY, CA 94561-2786 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | Jan 31, 2005 · Amount on Record |
| Deed Sale | Jan 31, 2005 · Amount on Record |
| Deed Document Number | 200533701 |
| Last Transfer Date | Nov 26, 2012 |
| Transfer Doc | 0000307273 |
| Record Updated | Sep 20, 2026 |
Source: Contra Costa County records · Assessment roll updated July 14, 2026 · Last verified July 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Oakley City |
| Secondary School District | Liberty Union High School District (09 - 12) |
| Elementary School District | Oakley Union Elementary School District (KG - 08) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $642,346 (+2%) Land $255,913 Building $386,433 | |
| 2025 | $9,953.00 (+3.5%) Homeowner's exemption | $629,752 (+4.04%) Land $250,896 Building $378,856 |
| 2023 | $9,616.00 (+1.64%) Homeowner's exemption | $605,300 Land $241,154 Building $364,146 |
| 2022 | $9,461.00 |
Source: FEMA National Flood Hazard Layer as of October 12, 2026 · FEMA NFIP claims and policies as of September 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 1 in force |
| Wildfire Risk | Low lower than 64% of the US · lower than 78% of California |
|---|---|
| Wildfire Likelihood | 0.04% annual chance |
| Exposure | None beyond ember reach |
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: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026
| 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 USA Fixed Wireless | 100 / 20 |
Based on FCC filings for 352 locations within half a mile of this property.
Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | DIABLO WATER DISTRICT serves 47,158 people |
|---|---|
| Water Source | Purchased surface water from RANDALL-BOLD WATER TREATMENT PLANT |
| Last State Inspection | Jan 2024 |
| Also Mapped Here | CONTRA COSTA WATER DISTRICT |
| Lead | 2 ppb (2020–2022) 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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.
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