Contra Costa County property record for 340 Oneil Cir, Hercules, CA 94547
| Property Type | Townhouse |
|---|---|
| Details | 3 bd · 2.5 ba · 1,445 sqft · built 1988 |
| Lot Size | 0.06 acres (2,620 sqft) |
| Owner | 2 Individual Names on File |
| Tax Bill | $5,549 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 404-351-074-4 |
| Primary APN | 404-351-074-4 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 7 Rooms |
| Stories | 2 Stories |
| Building Area | 1,445 sqft Living Area |
| 1st Floor Area | 728 sqft |
| 2nd Floor Area | 717 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1988 |
|---|---|
| Effective Year Built | Effective 1988 |
| Architectural Style | Townhouse |
| Exterior Material | Wood Siding |
| Roof Material | Tile |
| Lot Area | 2,620 sqft (0.06 acres) |
| View / Lot | Bayou |
| Garage Type | Attached |
| Garage Area | 402 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Forced Air with A/C |
| Heating Fuel | Gas |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 340 ONEIL CIR |
|---|---|
| City | HERCULES |
| State | CA |
| Zip | 94547-3747 |
| Property Category | Residential |
| Property Type | Residential > Condominium / Townhouse > Townhouse |
| Legal Description | T6773 L74 |
| Legal Tract | 6773 |
| Legal Lot Number | 74 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | WEST CONTRA COSTA |
| Census Block Group | 2 |
| Census Block | 2027 |
| Census Tract | 359105 |
Source: Contra Costa County records · APN 404-351-074-4
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 | 2 Individual Names on File |
|---|---|
| Mailing Address | 340 ONEIL CIR, HERCULES, CA 94547-3747 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| 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 | Hercules City |
| Unified School District | West Contra Costa Unified School District (KG - 12) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $322,475 (+2%) Land $91,855 Building $230,620 | |
| 2025 | $5,549.00 (+5.04%) Homeowner's exemption | $316,153 (+4.04%) Land $90,054 Building $226,099 |
| 2023 | $5,283.00 (+1.21%) Homeowner's exemption | $303,878 Land $86,558 Building $217,320 |
| 2022 | $5,220.00 |
Source: FEMA National Flood Hazard Layer, Contra Costa County (06013C), as of October 12, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060133591052, as of September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition, as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 5 in force |
| 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 |
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) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| AT&T Fixed Wireless · DSL | 100 / 20 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
May also be available: Sonic Telecom, Unwired.
Based on FCC filings for 505 locations within half a mile of this property.
Source: EPA Safe Drinking Water Information System, water system CA0110005, as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | EAST BAY MUD serves 1,468,000 people |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Dec 2021 |
| 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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. This system sells water to local utilities; the supplier billing this address may be one of them. The full violation and enforcement history is in the system's EPA record.
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