Los Angeles County property record for 21478 Cold Spring Ln, Diamond Bar, CA 91765
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 3 ba · 2,712 sqft · built 1977 |
| Lot Size | 1.03 acres (45,292 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $285,000 (May 1996) |
| Tax Bill | $7,158 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 8714-001-006 |
| Primary APN | 8714-001-006 |
|---|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 3 Baths |
| Building Area | 2,712 sqft Living Area |
| Year Built | Built 1977 |
|---|---|
| Effective Year Built | Effective 1977 |
| Construction Type | Wood |
| Lot Area | 45,292 sqft |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Street Address | 21478 COLD SPRING LN |
|---|---|
| City | DIAMOND BAR |
| State | CA |
| Zip | 91765-3813 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | LCR19000* |
| Legal Description | *TR=32974 LOT 13 |
| Legal Subdivision | 32974 |
| Legal Tract | 32974 |
| Legal Block | 2 |
| Legal Lot Number | 13 |
| Jurisdiction | LOS ANGELES CA |
| Township / Civil Division | EAST SAN GABRIEL VALLEY |
| Census Block Group | 2 |
| Census Block | 2017 |
| Census Tract | 403325 |
21478 Cold Spring Ln is owned and occupied by two individuals who bought it in May 1996.
Source: Los Angeles County records, as of August 25, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 21478 COLD SPRING LN, DIAMOND BAR, CA 91765-3813 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
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 | May 8, 1996 · Amount on File |
| Deed Sale | May 8, 1996 · Amount on File |
| Prior Sale | Jan 26, 1995 · Amount on File |
| Deed Document Number | 1996722913 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 21478 Cold Spring Ln was $7,158.
Source: Los Angeles County assessment roll, as of August 25, 2026
| Type | Name |
|---|---|
| State | California |
| County | Los Angeles County |
| Municipality | Diamond Bar City |
| Unified School District | Walnut Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $518,157 (+2%) Land $212,134 Building $306,023 | |
| 2025 | $7,158.00 | $508,014 Land $207,975 Building $300,039 |
| 2023 | $6,505.00 (+2.86%) | $488,289 Land $199,900 Building $288,389 |
| 2022 | $6,324.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 21478 Cold Spring Ln in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective September 30, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 21478 Cold Spring Ln is low, with a 0.03% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 66% of the US · lower than 80% of California |
|---|---|
| Wildfire Likelihood | 0.03% 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 | WALNUT VALLEY WATER DISTRICT serves 100,941 people · EPA ID CA1910234 |
|---|---|
| Water Source | Purchased surface water from several systems |
| Last State Inspection | Jun 2023 |
| 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 425 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Frontier Fiber | 7,000 / 7,000 |
| Spectrum Cable · Fiber in parts of the area | 1,000 / 1,000 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: Verizon.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures