Contra Costa County property record for 1855 Mount Conness Ct, Antioch, CA 94531
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 3 ba · 2,697 sqft · built 1999 |
| Lot Size | 0.21 acres (9,150 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $330,000 (Mar 2013) |
| Tax Bill | $4,935 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 055-480-012-8 |
| Primary APN | 055-480-012-8 |
|---|---|
| Alternative APN |
|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 11 Rooms |
| Stories | 2 Stories |
| Building Area | 2,697 sqft Living Area |
| 1st Floor Area | 1,260 sqft |
| 2nd Floor Area | 1,437 sqft |
| Year Built | Built 1999 |
|---|---|
| Effective Year Built | Effective 2000 |
| Lot Area | 9,150 sqft (0.21 acres) |
| Garage Type | Attached |
| Garage Area | 698 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|
| Street Address | 1855 MOUNT CONNESS CT |
|---|---|
| City | ANTIOCH |
| State | CA |
| Zip | 94531-7494 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T8181 L492 |
| Legal Tract | 8181 |
| Legal Lot Number | 492 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | TASSAJARA |
| Census Block Group | 1 |
| Census Block | 1009 |
| Census Tract | 355120 |
Source: Contra Costa County assessment roll, 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 | 2 Individual Names on File |
|---|---|
| Mailing Address | 1855 MOUNT CONNESS CT, ANTIOCH, CA 94531-7494 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Mar 19, 2013 · Amount on Record |
| Deed Sale | Mar 19, 2013 · Amount on Record |
| Prior Sale | Mar 6, 2000 · Amount on Record |
| Deed Document Number | 201368181 |
| Prior Transfer Date | Mar 5, 2008 |
| Prior Transfer Doc | 0000051431 |
| 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 | Antioch City |
| Unified School District | Antioch Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $414,486 (+2%) Land $81,637 Building $332,849 | |
| 2025 | $4,935.00 (+6.27%) | $406,360 (+4.04%) Land $80,037 Building $326,323 |
| 2023 | $4,644.00 (+1.55%) | $390,582 Land $76,930 Building $313,652 |
| 2022 | $4,573.00 |
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
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 0.01% annual chance |
| Exposure | None beyond ember reach |
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | CITY OF ANTIOCH serves 116,781 people · EPA ID CA0710001 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jan 2024 |
| Lead | Under 1 ppb (2022–2024) 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 611 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 |
May also be available: T-Mobile USA, Unwired.
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