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3646 Monterosa Dr, Altadena
APN 5843-004-016 · map page 5843-004
A 16,816 sq ft residential lot with no building on the tax roll at 3646 Monterosa Dr in Altadena, Los Angeles County (APN 5843-004-016). It burned in the Eaton Fire (2025), and 2 earlier mapped fires reached it. It is in a Very High CAL FIRE hazard zone and outside the FEMA flood zone (zone X). It is zoned R-1-10000 (single-family residence) by Los Angeles County. It is assessed at $333,211, with a yearly tax bill of $4,848. Property taxes are not in default.
Risk Assessment
Flood
Zone X — AREA OF MINIMAL FLOOD HAZARD
Outside flood zone
Low Risk
Fire
CAL FIRE hazard severity zone
Very High
High Risk
Past Fires
3 mapped fires since 1900
Eaton Fire, 2025
High Risk
Property Details
- APN
- 5843-004-016
- Area
- Altadena, Los Angeles County
- Zoning
- R-1-10000 · Single-Family Residence
- Assessor Use
- Single (0101)
Solar
4,446 hrs/yr
Excellent
Weather & Climate
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Taxes
- Tax Status
- Current
- Yearly Tax Bill
- $4,848
From the LA County Treasurer and Tax Collector's rolls, checked Oct 19, 2026.
Tax Assessment History
| Year | Land | Improvement | Total |
|---|---|---|---|
| 2025 | $326,678 | $0 | $326,678 |
| 2024 | $492,727 | $198,891 | $691,618 |
| 2023 | $483,066 | $194,992 | $678,058 |
| 2022 | $473,595 | $191,169 | $664,764 |
| 2021 | $464,309 | $187,421 | $651,730 |
| 2020 | $459,549 | $185,500 | $645,049 |
| 2019 | $450,539 | $181,863 | $632,402 |
| 2018 | $441,705 | $178,298 | $620,003 |
| 2017 | $433,045 | $174,802 | $607,847 |
| 2016 | $424,554 | $171,375 | $595,929 |
Owner
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Full parcel report · $29
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Official record: county assessor