San Bernardino County property record for 528 W 4th St, Ontario, CA 91762
| Property Type | Single Family Home |
|---|---|
| Details | 2 bd · 2 ba · 1,492 sqft · built 1947 |
| Lot Size | 0.227 acres (9,886 sqft) |
| Owner | Individual Name on Record |
| Last Sale | $412,000 (Oct 2004) |
| Tax Bill | $6,310 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 1047-581-05-0000 |
| Primary APN | 1047-581-05-0000 |
|---|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,492 sqft Living Area |
| Gross Area | 1,942 sqft |
| 1st Floor Area | 1,492 sqft |
| Family Room | Family Room |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1947 |
|---|---|
| Effective Year Built | Effective 1947 |
| Architectural Style | Conventional |
| Construction Type | Frame |
| Roof Material | Composition Shingle |
| Lot Area | 9,886 sqft (0.227 acres) |
| Garage Type | Attached |
| Garage Area | 450 sqft |
| Parking Spaces | 2 Parking Spaces |
| Porch | Patio/Porch |
| Porch Area | 114 sqft |
| Patio Area | 114 sqft |
| Cooling System | None |
|---|---|
| Heating System | Floor/Wall Furnace |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 528 W 4TH ST |
|---|---|
| City | ONTARIO |
| State | CA |
| Zip | 91762-1942 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | ONTAR1O COLONY LANDS W 69.5 FT E 314.99 FT S 142.25 FT LOT 796 |
| Legal Subdivision | CITY OF ONTARIO |
| Legal Block | 1 |
| Legal Lot Number | 796 |
| Jurisdiction | SAN BERNARDINO CA |
| Township / Civil Division | ONTARIO |
| Census Block Group | 1 |
| Census Block | 1001 |
| Census Tract | 1103 |
Source: San Bernardino County records, 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 | Individual Name on Record |
|---|---|
| Mailing Address | 528 W 4TH ST, ONTARIO, CA 91762-1942 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Sole Owner |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Oct 26, 2004 · Amount on Record |
| Deed Sale | Oct 26, 2004 · Amount on Record |
| Prior Sale | May 18, 2004 · Amount on Record |
| Deed Document Number | 2004776920 |
| Prior Transfer Date | Oct 15, 2004 |
| Prior Transfer Doc | 0000776921 |
| Record Updated | Sep 20, 2026 |
Source: San Bernardino County assessment roll, as of July 14, 2026
| Type | Name |
|---|---|
| State | California |
| County | San Bernardino County |
| Municipality | Ontario City |
| Secondary School District | Chaffey Joint Union High School District (09 - 12) |
| Elementary School District | Ontario-Montclair School District (KG - 08) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $585,780 (+2%) Land $205,023 Building $380,757 | |
| 2025 | $6,310.00 (+5.29%) | $574,294 (+4.04%) Land $201,003 Building $373,291 |
| 2023 | $5,993.00 (+1.34%) | $551,994 Land $193,198 Building $358,796 |
| 2022 | $5,914.00 |
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 · 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 Policies | 1 in force |
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: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within 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 | ONTARIO MUNICIPAL UTILITIES COMPANY serves 185,010 people · EPA ID CA3610034 |
|---|---|
| Water Source | Purchased surface water from several systems |
| Last State Inspection | Jul 2025 |
| 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 487 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Frontier Fiber | 7,000 / 7,000 |
| Spectrum Cable | 1,000 / 1,000 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: GeoLinks.
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