Contra Costa County property record for 821 Mariposa Ave, Rodeo, CA 94572
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2.5 ba · 1,416 sqft · built 1936 |
| Lot Size | 0.144 acres (6,250 sqft) |
| Owner | Individual Name on File |
| Last Sale | $102,000 (Oct 2003) |
| Tax Bill | $5,981 (2025) |
| Flood Zone | Zone AE (high risk) |
| APN | 357-192-008-5 |
| Primary APN | 357-192-008-5 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 8 Rooms |
| Stories | 1 Story |
| Building Area | 1,416 sqft Living Area |
| Gross Area | 936 sqft |
| 1st Floor Area | 936 sqft |
| Year Built | Built 1936 |
|---|---|
| Effective Year Built | Effective 1936 |
| Lot Area | 6,250 sqft (0.144 acres) |
| Garage Type | Attached |
| Garage Area | 240 sqft |
| Parking Spaces | 1 Parking Space |
| Street Address | 821 MARIPOSA AVE |
|---|---|
| City | RODEO |
| State | CA |
| Zip | 94572-1213 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | P1 |
| Legal Description | TOWN OF RODEO LOTS 14 & 15 BLK 34E |
| Legal Subdivision | RODEO |
| Legal Block | 34E |
| Legal Lot Number | 14,15 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | WEST CONTRA COSTA |
| Census Block Group | 4 |
| Census Block | 4008 |
| Census Tract | 358000 |
821 Mariposa Ave is owned and occupied by an individual who bought it in October 2003.
Source: Contra Costa County records, as of July 14, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 821 MARIPOSA AVE, RODEO, CA 94572-1213 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Single Person |
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 | Name on Deed |
|---|---|
| Last Sale | Oct 28, 2003 · Amount on File |
| Deed Sale | Oct 28, 2003 · Amount on File |
| Prior Sale | Dec 8, 2000 · Amount on File |
| Deed Document Number | 2003533114 |
| Prior Transfer Date | Nov 28, 2000 |
| Prior Transfer Doc | 0000276234 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 821 Mariposa Ave was $5,981.
Source: Contra Costa County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Unified School District | John Swett Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $238,204 (+2%) Land $138,314 Building $99,890 | |
| 2025 | $5,981.00 | $233,534 Land $135,602 Building $97,932 |
| 2023 | $5,559.00 (+5.12%) | $224,468 Land $130,338 Building $94,130 |
| 2022 | $5,288.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 821 Mariposa Ave in Zone AE, a high-risk flood area; flood insurance is required for federally backed loans.
Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone AE high risk |
|---|---|
| 100-Year Floodplain | Yes 1% annual chance |
| Floodway | No |
| Base Flood Elevation | Varies along the reach; see FIRM |
| Flood Insurance Requirement | Required federally backed loans |
| Flood Insurance Cost | Premium on File median of 53 policies |
| Community Rating System | Class 6 (20% premium discount) |
| Nearby Flood Policies | 53 in force |
| Nearby Flood Claims | 4 (1998–2014) |
| Most Recent Claim | Dec 2014 · 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.
Wildfire risk around 821 Mariposa Ave is low, with a 0.01% annual chance of wildfire.
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 |
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 740 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · Fixed Wireless, DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
May also be available: T-Mobile, Unwired.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures