Riverside County property record for 4138 Mariposa Ave, Riverside, CA 92503
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2.5 ba · 1,854 sqft · built 1984 |
| Lot Size | 0.44 acres (19,166 sqft) |
| Owner | 2 Individual Names on File |
| Tax Bill | $6,625 (2025) |
| Deeds & Mortgages | Jul 2021 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 145-103-022 |
| Primary APN | 145-103-022 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 2 Half Baths |
| Stories | 1 Story |
| Building Area | 1,854 sqft Living Area |
| Gross Area | 2,458 sqft |
| 1st Floor Area | 1,854 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1984 |
|---|---|
| Effective Year Built | Effective 1984 |
| Construction Type | Wood |
| Roof Material | Gravel |
| Lot Area | 19,166 sqft (0.44 acres) |
| Garage Type | Attached |
| Garage Area | 484 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Heating Fuel | Gas |
| Sewer | Connected |
| Old Parcel Number | 145103018 |
|---|---|
| Street Address | 4138 MARIPOSA AVE |
| City | RIVERSIDE |
| State | CA |
| Zip | 92503-3411 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1065 |
| Legal Description | .44 ACRES M/L IN LOT 18 MB 012/042 LA GRANADA |
| Legal Subdivision | LA GRANADA |
| Legal Block | 45 |
| Legal Lot Number | 18 |
| Jurisdiction | RIVERSIDE CA |
| Township / Civil Division | RIVERSIDE |
| Census Block Group | 2 |
| Census Block | 2005 |
| Census Tract | 41201 |
4138 Mariposa Ave is owned and occupied by two individuals who acquired it in August 1975.
Source: Riverside County records, as of July 29, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 4138 MARIPOSA AVE, RIVERSIDE, CA 92503-3411 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Community Property |
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 Transfer Date | Aug 21, 1975 |
| Transfer Doc | 0000040798 |
| Record Updated | Oct 29, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | RIVERSIDE CA |
| Recording Date | Jul 7, 2021 |
| Property Address | 4138 MARIPOSA AVE, RIVERSIDE, CA 92503-3411 |
| Document Number | 0000408625 |
| Map Reference | MB 12 PG 42-51 |
| Instrument Date | Jul 3, 2021 |
| Instrument | 2021-0408625 |
| Transaction Type | Transfer |
| Record Updated | Jul 20, 2021 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | No Consideration Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property with Right of Survivorship |
| Address | 4138 MARIPOSA AVE, RIVERSIDE, CA 92503-3411 |
The 2025 property tax bill for 4138 Mariposa Ave was $6,625 with a homeowner's exemption.
Source: Riverside County assessment roll, as of July 29, 2026
| Type | Name |
|---|---|
| State | California |
| County | Riverside County |
| Municipality | Riverside City |
| Unified School District | Alvord Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $552,038 (+2%) Land $162,364 Building $389,674 | ||
| 2025 | $6,625.00 Homeowner's exemption | $541,215 Land $159,181 Building $382,034 | |
| 2023 | $6,314.00 (+6.44%) Homeowner's exemption | $520,200 Land $153,000 Building $367,200 | |
| 2022 | $5,932.00 | ||
| 2021 | $439,650 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 4138 Mariposa Ave in Zone X, an area of minimal flood risk, though there have been 1 flood claim nearby since 1993.
Source: FEMA National Flood Hazard Layer, effective October 14, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Claims | 1 (1993) |
| Most Recent Claim | Jan 1993 · Severe Winter Storm, Mud & Land Slides, & Flooding |
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 4138 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 99.1% of the US · lower than 99.2% of California |
|---|---|
| Wildfire Likelihood | 0.01% annual chance |
| Exposure | Direct burnable vegetation |
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 | CITY OF RIVERSIDE serves 302,776 people · EPA ID CA3310031 |
|---|---|
| Water Source | Groundwater influenced by surface water |
| Lead | 1 ppb (2023–2025) 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 462 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Spectrum Cable · Fiber in parts of the area | 1,000 / 1,000 |
| AT&T DSL · Fiber in parts of the area | 100 / 20 |
May also be available: GeoLinks, T-Mobile, Verizon.
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