Insurance Services Office (ISO)

City of Mill Valley ISO Rating: Class 1

Insurance Services Office (ISO) collects and evaluates information from communities in the United States on their structure fire suppression capabilities.  The data analyzed using the ISO's "Fire Suppression Rating Schedule" and then a Public Protection Classification (PPC) number is assigned to the community.  Insurance companies use the Public Protection Classification information for marketing, underwriting and to help establish fair premiums for homeowner and commerical fire insurance.  In general, the price of fire insurance in a community with a good PPC is substancially lower than in a community with a poor PPC, assuming all other factors are equal. 

In 2015, the Mill Valley Fire Department was contacted by Insurance Services Office or their intent to perform a Public Protection Classification (PPC) survey for the City of Mill Valley.  This survey completes an analysis of the structural fire suppression delivery system provided by the Mill Valley Fire Department.  A community's PPC depends on:

  • Needed Fire Flows ( for suppression purposes)
  • Receiving and Handling of Fire Alarms
  • Fire Department ( equipment, staffing and station locations)
  • Water Supply
  • Community Risk Reduction

As a result of completing the survey associated with the operations of the fire department and infrastructure, The Mill Valley improved our classification score from 3 to a 1, the highest score available.   To give you an idea of other communities in California:

  • 8 communities are a Class 1
  • 86 communities are a Class 2
  • 204 communities are a Class 3
  • 222 communities are a Class 4
  • 221 communities are a Class 5
  • 87 communities are a Class 6
  • 29 communities are a Class 7
  • 5 communities are a Class 8
  • 58 communities are a Class 9
  • 18 communities are a Class 10

The Mill Valley Fire Department is proud of this classification and continues to strive for excellence in all aspects of our job.  Click here to view/download a copy of Mill Valley's ISO report.