Since its incorporation in 1960, the unprecedented growth of San Dimas has transformed the City from an essentially rural area to a well-balanced community offering industrial, commercial, and residential living. In addition to the 1,700 acre Frank G. Bonelli Recreational Area which lies within the City boundaries, there are many parks such as San Dimas Canyon Park, a city-owned golf course (San Dimas Canyon Golf Club), and over 27 miles of equestrian trails for riding. The city services include an extensive recreational program for youth and for senior citizens, and the City boasts a new modern City Hall, with excellent provisions made for County Sheriff and Fire Departments, along with a fine Los Angeles County Library and Engineering Regional Office.
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2025 Fire Hazard Severity Zones in San Dimas
On March 24, 2025, CAL FIRE released updated Fire Hazard Severity Zone (FHSZ) maps for Local Responsibility Areas (LRAs) across Southern California, including the City of San Dimas. These maps are designed to reflect updated fire science and help guide land use, construction standards, and emergency planning.
What Does This Mean for San Dimas?
The Office of the State Fire Marshal (CAL FIRE) is required by state law (Government Code §51178 and §51179) to assess fire hazards in LRA areas and recommend updated maps to cities for adoption.
- The City has 120 days from CAL FIRE's official notice to adopt the maps.
- The City can increase, but not decrease, fire zone designations if making changes.
City staff is currently reviewing the map in coordination with the Los Angeles County Fire Department.
View the updated San Dimas Map below, as well as CAL FIRE zone map viewer.
San Dimas Fire Hazard Severity Zone Map
LRA Severity Zone FAQ
California Insurance Commissioner Safer From Wildfires Information
California Consumer Alert - CAL FIRE Hazard Maps Do Not Affect Insurance Rates or Availability
Commissioner Lara’s new wildfire safety regulation will help increase access to insurance by promoting wildfire safety across the state. Reducing wildfire risks throughout the state is the primary way we can make insurance more available and affordable, and our regulation is a major step towards that goal. CAL FIRE’s maps support that goal through improving public education about hazard and the need for safety preparation.
For many years, insurance companies have been using alternate wildfire risk tools for determining where they will write and renew policies, and how much premium to charge a policyholder, not the Fire Hazard Severity Zones maps. Therefore, a change in designation on the maps for a single homeowner is unlikely to affect their insurance. The reality is that more accurate risk information enables homeowners and communities to reduce their wildfire risks, and Commissioner Lara’s new wildfire mitigation regulation clarifies what actions you should take to reduce wildfire risks. Once that regulation is fully implemented, if a homeowner or business owner takes those risk mitigation actions, they will be able to see a discount in their insurance premium
To make a public comment, obtain hard copy maps for viewing, and for further information please contact Anissa Livas, Senior Management Analyst at alivas@sandimasca.gov or 909-394-6215.
Government Code Sec. 51179(b)(1) allows for the City of San Dimas, at its discretion, to include areas not identified as Very High FHSZs, as Very High following a finding supported by substantial evidence in the record that the requirements of Government Code Sec. 51182 (i.e., defensible space) are necessary for effective fire protection within the area.
Further Government Code Sec. 51179(b)(2) allows for the City of San Dimas, at its discretion, include areas not identified as Moderate and High FHSZs, as Moderate and High.
Furthermore, Government Code Sec. 51179(b)(3) directs that the City of San Dimas cannot decrease the level of fire hazard severity zones for any area and may only increase the level.
Pursuant to Government Code Sec. 51179(d) any changes made by the City of San Dimas to the 2025 LRA FHZS maps provided by the State Fire Marshall are final and are not rebuttable by the State.
The State Fire Marshall FHSZ Rollout Plan includes the City of San Dimas in “Phase 4” starting March 24, 2025, which is the date the City received the 2025 LRA FHZS maps that evaluate “hazard,” not “risk” to include areas or zones of Very High, High, and Moderate fire hazard based on consistent statewide criteria and the severity of fire hazard that is expected to prevail in those areas (Government Code Sec. 51178).
“Hazard” is based on the physical conditions that create a likelihood and expected fire behavior over a 30 to 50-year period without considering mitigation measures such as home hardening, recent wildfire, or fuel reduction efforts. “Risk” is the potential damage a fire can do to the area under existing conditions, accounting for any modifications such as fuel reduction projects, defensible space, and ignition resistant building construction.
The zones must be based on fuel loading, slope, fire weather, and other relevant factors including areas where winds have been identified by the State Fire Marshall as a major cause of wildfire spread. These map updates are intended to enhance California’s approach to wildfire preparedness.
Pursuant to Government Code Sec. 51178.5 within 30 days after receiving a transmittal from the State Fire Marshal that identifies fire hazard severity zones pursuant to Government Code Sec. 51178, the City of San Dimas must make the information available for public review and comment, and the information must be presented in a format that is understandable and accessible to the general public, including, but not limited to, maps.
The City of San Dimas must also post a notice (Government Code Sec. 51179(g)) at the office of the City Clerk identifying the location of the map provided by the State Fire Marshal pursuant to Government Code Sec. 51178.
This website has been established, making the information available for public review and comment.