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3657 Fair Oaks Ave, Altadena, APN 5831-010-004
14 more lots on map page 5831-010
A 13,044 sq ft residential lot with no building on the tax roll at 3657 Fair Oaks Ave in Altadena, Los Angeles County (APN 5831-010-004). 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-1-7500 (single-family residence) by Los Angeles County. It is assessed at $127,570, with a yearly tax bill of $1,983. 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
Fire history
- Eaton Fire burned this lotJan 2025 · 14,056 acres
- Las Flores No. 57 Fire burned this lotOct 1935 · 2,521 acres
- Big Fire burned this lot1900 · 2,521 acres
- Station Fire 0.3 mi NW2009 · 160,833 acres
- Kinneloa Fire 0.3 mi NE1993 · 5,453 acres
- Crest Fire 2.3 mi W1984 · 606 acres
From CAL FIRE's historic fire perimeters (since 1878), which miss some small and older fires.
From FEMA flood maps and CAL FIRE hazard zones. Maps can lag; confirm with the county before you buy. What the zones mean: flood, fire.
Slope
From USGS elevation data (about 10 m detail), so small banks and retaining walls won't show. Turn on 3D on the map above to see the slopes around it.
Sun
Seen from above: north is up, the rim is the horizon, the middle is straight overhead. Buildings and trees aren't included.
Solar energy
5.4kWh/m² a day
good, coastal-level
A 6 kW home system
10,800kWh a year
1,800 kWh per kW of panels
Output is for ground-mounted panels at the best tilt; rooftop systems usually make about 10% less. Monthly GHI: PRISM 1991–2020 normals (soltotal), 800 m — PRISM Group, Oregon State University Annual GHI, DNI and PV output: Global Solar Atlas 2.0 — © Solargis, World Bank/ESMAP, CC BY 4.0
Soil
Urban land-Soboba-Tujunga complex, 5 to 15 percent slopes
Mapped as built-over land mixed with Soboba soil (about 30% of the area), which is shown here.
- Water
- Water drains away very fast; it dries out quickly
- Farming without irrigation
- Class 4 of 8: Crops only with careful management, limited by erosion.
- Building a house (no basement)
- Somewhat limited · slope, large stones
- Septic system
- Very limited · filtering capacity, seepage, bottom layer, slope
Typical layers for the main soil mapped in this area by the USDA soil survey (CA696, 1:24,000), shaded by texture. Your lot may differ: get a soil or percolation test before you buy to build.
Climate
Hottest
91°F
Aug highs
Coldest
47°F
Feb lows
Rain
24.2in/yr
mostly Dec–Mar
Spend a year here and summer stays mild, around 91°F at its warmest; winter nights rarely freeze (47°F lows in February); most of the 24.2 inches of rain a year falls Dec–Mar.
30-year averages (1991–2020) for this spot from PRISM, Oregon State University, at about 800 m detail. Single years can be much hotter, colder or wetter.
Property Details
- APN
- 5831-010-004
- Area
- Altadena, Los Angeles County
- Zoning
- R-1-7500 · Single-Family Residence
- Assessor Use
- Single (0100)
R-1-7500: Single-Family Residence
Single-family homes.
- Building a house
- Allowed with a site plan review (a staff check, no hearing)
- Smallest lot allowed
- 7,500 sq ft
From LA County Code Table 22.18.030-B, LA County Code §22.110.130. A summary, not a permit answer: confirm with the Los Angeles County planning department before you buy.
Taxes
- Tax Status
- Current
- Yearly Tax Bill
- $1,983
From the LA County Treasurer and Tax Collector's rolls, checked Oct 21, 2026.
Tax Assessment History
The assessment has stayed within the 2% a year limit, so the county hasn't reassessed it for a sale or new building in this period. Assessed values are not market prices.
Show every yearHide years
| Year | Land | Building | Total |
|---|---|---|---|
| 2025 | $125,069 | $0 | $125,069 |
| 2024 | $188,642 | $133,795 | $322,437 |
| 2023 | $184,944 | $131,172 | $316,116 |
| 2022 | $181,318 | $128,600 | $309,918 |
| 2021 | $177,763 | $126,079 | $303,842 |
| 2020 | $175,941 | $124,787 | $300,728 |
| 2019 | $172,492 | $122,341 | $294,833 |
| 2018 | $169,110 | $119,943 | $289,053 |
| 2017 | $165,795 | $117,592 | $283,387 |
| 2016 | $162,545 | $115,287 | $277,832 |
Owner
Who owns this land?
Thinking of buying?
Talk to a local land agent
An agent who knows land in this area can check zoning, access, water and what nearby lots sold for, and make an offer for you.
Buying this land?
Full parcel report · $29
Can you build on it, how do you reach it, and what is it worth? Flood, fire, slope, road access, tax history and nearby sales in one report.
Official record: county assessor