Contra Costa County property record for 284 Grissom St, Hercules, CA 94547
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 3 ba · 2,675 sqft · built 1989 |
| Lot Size | 0.161 acres (7,000 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $292,000 (Mar 1998) |
| Tax Bill | $7,570 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 362-372-004-6 |
| Primary APN | 362-372-004-6 |
|---|---|
| Alternative APN |
|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 11 Rooms |
| Stories | 2 Stories |
| Building Area | 2,675 sqft Living Area |
| 1st Floor Area | 1,435 sqft |
| 2nd Floor Area | 1,240 sqft |
| Year Built | Built 1989 |
|---|---|
| Effective Year Built | Effective 1989 |
| Lot Area | 7,000 sqft (0.161 acres) |
| Garage Type | Attached |
| Garage Area | 630 sqft |
| Parking Spaces | 2 Parking Spaces |
| Street Address | 284 GRISSOM ST |
|---|---|
| City | HERCULES |
| State | CA |
| Zip | 94547-1047 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T6722 L39 |
| Legal Tract | 6722 |
| Legal Lot Number | 39 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | BRIONES |
| Census Block Group | 2 |
| Census Block | 2000 |
| Census Tract | 356002 |
284 Grissom St is owner-occupied and held in a trust since October 2015.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 284 GRISSOM ST, HERCULES, CA 94547-1047 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust |
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 Sale | Mar 20, 1998 · Amount on File |
| Deed Sale | Mar 20, 1998 · Amount on File |
| Deed Document Number | 199857354 |
| Last Transfer Date | Oct 19, 2015 |
| Transfer Doc | 0000224151 |
| Record Updated | Sep 20, 2026 |
The 2025 property tax bill for 284 Grissom St was $7,570 with a homeowner's exemption.
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Municipality | Hercules City |
| Unified School District | West Contra Costa Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $475,553 (+2%) Land $84,680 Building $390,873 | |
| 2025 | $7,570.00 Homeowner's exemption | $466,229 Land $83,020 Building $383,209 |
| 2023 | $6,870.00 (-4.86%) Homeowner's exemption | $448,128 Land $79,798 Building $368,330 |
| 2022 | $7,221.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 284 Grissom St in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
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 A, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 1 in force |
| Nearby Flood Claims | 7 (1993–2017) |
| Claims Outside the SFHA | 2 of 7 |
| Most Recent Claim | Feb 2017 · Severe Winter Storms, Flooding, And Mudslides |
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 284 Grissom St is high, ranking above 74% of the US, with a 0.5% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | High above 74% of the US · above 50% of California |
|---|---|
| Wildfire Likelihood | 0.5% annual chance |
| Exposure | Indirect within ember reach |
| Adjoins Burnable Land | Yes |
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 | EAST BAY MUD serves 1,468,000 people · EPA ID CA0110005 |
|---|---|
| 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, 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.
Source: FCC Broadband Data Collection, based on 216 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: Unwired.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures