ISO Ratings


Insurance Services Office's (ISO) statistical evaluation for commercial properties has as one component the Territorial Multiplier, derived from Statistical Grading. This method analyzes loss cost for jurisdictions. In Virginia, only four areas are statistically graded: Norfolk, Richmond, Virginia Beach, and Fairfax County. In statistical grading, these four areas are rated against the “balance of the state” which is given the index value of 1.0. Less than 1.0 means relatively less loss cost, while greater than 1.0 means relatively greater loss cost.

Current ISO Ratings for Fairfax County:

  • ISO Public Protection Split Classification: 3/9 *
  • ISO Statistical Territorial Multiplier: .950

* Note: In 1984, Fairfax County was graded, non-statistically, as 3/9 in the ISO Public Protection Classification system. This designation was frozen in 1984, and is not considered in current statistical grading.

For more information about ISO ratings and public fire-protection classification, please visit the ISO Mitigation Online website.


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Fairfax County Fire and Rescue Department
Office of the Fire Marshal
10700 Page Avenue
Fairfax, Virginia 22030
Telephone: 703-246-4800
Fax: 703-691-0209
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