ZIP code 91748

Los Angeles County, including Rowland Heights and Industry

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Report created October 27, 2026 at www.firezones.info/zip/91748

  • Fire hazard severity zones

    Share of the land in each CAL FIRE hazard class

    45% Very High

    Most of the Very High land is in the State Responsibility Area, where the State Fire Marshal's zones apply.

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  • Fire history

    Share of the land inside a recorded wildfire perimeter

    43% has burned

    Most recently the 2020 Canyon Fire, which burned 7 acres here, one of 19 fires on record.

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  • Power line fire risk

    Share of the land in the High Fire-Threat District

    30% Extreme

    Utilities may shut off power in the CPUC High Fire-Threat District in fire weather, and homes outside it can lose power when their lines run through it.

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Land by hazard class

  1. Very High 4,084 acres · 3,164 state, 919 local 45%
  2. High 281 acres · 6 state, 275 local 3%
  3. Moderate 267 acres · 4 state, 263 local 3%
  4. Non-wildland 4,470 acres · Local Responsibility Area 49%
  5. Not mapped by CAL FIRE 21 acres · Mostly federal land <1%

9,123 acres of land in all, 3,175 in the State Responsibility Area and 5,927 in the Local. State zones are the ones the State Fire Marshal designated, in effect since 1 April 2024. Local zones are CAL FIRE's 2025 recommendation, which each city or county adopts by ordinance and can make stricter. How to read fire zones

Largest fires

  1. 1970 Fullerton Fire Of 3,381 acres in all 2,988 acres
  2. 1955 Hacienda Fire Of 1,148 acres in all 376 acres
  3. 1967 Powder Fire 245 acres
  4. 1928 Brea Shell No. 24 Fire 166 acres
  5. 1939 La Habra No. 33 Fire Of 1,521 acres in all 154 acres
  6. 1949 Vejar No. 168 Fire 122 acres
  7. 1944 Howard Fire Of 147 acres in all 87 acres
  8. 1928 Shell Oil No. 11 Fire Of 91 acres in all 81 acres
  9. 1979 Unnamed fire 68 acres
  10. 1979 Unnamed fire 41 acres

And 9 smaller fires. In all, 3,922 acres of ZIP code 91748 have burned. Acres are the land each fire burned here, and fires that crossed less than an acre are not counted. Some older or smaller fires may be missing, and a fire perimeter can include unburned patches. How to read fire history

Sources

Fire hazard severity zones
CAL FIRE Office of the State Fire Marshal
State map published 27 June 2025, local map 2 February 2026
Fire history
CAL FIRE Fire and Resource Assessment Program
Published 28 July 2026
Power line fire risk
California Public Utilities Commission
Published 23 February 2026

This site is independent and not affiliated with CAL FIRE or the CPUC, so for an official determination, check with the agency or your city or county. How we read the data

Nearby areas

Communities in ZIP code 91748

Neighboring ZIP codes

  1. 91748 45% Very High · this area
  2. 90631 24% Very High
  3. 91744 6% Very High
  4. 91745 38% Very High
  5. 91765 55% Very High
  6. 91789 17% Very High
  7. 91792 13% High
  8. 92821 57% Very High