staff report memo · M-10
M-10 - Public Protection Classification Report - ISO Rating
Page 2 of 24
Text from the PDF text layer; check the PDF for anything that matters. Background Information
Introduction
ISO collects and evaluates information from communities in the United States on their structure
fire suppression capabilities. The data is analyzed using our Fire Suppression Rating Schedule
(FSRS) and then a Public Protection Classification (PPC©) grade is assigned to the community.
The surveys are conducted whenever it appears that there is a possibility of a PPC change. As
such, the PPC program provides important, up-to-date information about fire protection
services throughout the country.
The FSRS recognizes fire protection features only as they relate to suppression of first alarm
structure fires. In many communities, fire suppression may be only a small part of the fire
department's overall responsibility. ISO recognizes the dynamic and comprehensive duties of
a community's fire service, and understands the complex decisions a community must make
in planning and delivering emergency services. However, in developing a community’s PPC
grade, only features related to reducing property losses from structural fires are evaluated.
Multiple alarms, simultaneous incidents and life safety are not considered in this evaluation.
The PPC program evaluates the fire protection for small to average size buildings. Specific
properties with a Needed Fire Flow in excess of 3,500 gpm are evaluated separately and
assigned an individual PPC grade.
A community's investment in fire mitigation is a proven and reliable predictor of future fire
losses. Statistical data on insurance losses bears out the relationship between excellent fire
protection – as measured by the PPC program – and low fire losses. So, insurance companies
use PPC information for marketing, underwriting, and to help establish fair premiums for
homeowners and commercial fire insurance. In general, the price of fire insurance in a
community with a good PPC grade is substantially lower than in a community with a poor PPC
grade, assuming all other factors are equal.
ISO is an independent company that serves insurance companies, communities, fire
departments, insurance regulators, and others by providing information about risk. ISO's expert
staff collects information about municipal fire suppression efforts in communities throughout
the United States. In each of those communities, ISO analyzes the relevant data and assigns
a PPC grade – a number from 1 to 10. Class 1 represents an exemplary fire suppression
program, and Class 10 indicates that the area's fire suppression program does not meet ISO's
minimum criteria.
ISO's PPC program evaluates communities according to a uniform set of criteria, incorporating
nationally recognized standards developed by the National Fire Protection Association and the
American Water Works Association. A community's PPC grade depends on:
Needed Fire Flows, which are representative building locations used to determine the
theoretical amount of water necessary for fire suppression purposes.
Emergency Communications, including emergency reporting, telecommunicators,
and dispatching systems.
Fire Department, including equipment, staffing, training, geographic distribution of fire
companies, operational considerations, and community risk reduction.
Water Supply, including inspection and flow testing of hydrants, alternative water
supply operations, and a careful evaluation of the amount of available water compared
with the amount needed to suppress fires up to 3,500 gpm.
PPC is a registered trademark of Insurance Services Office, Inc.
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Sources
- sharepoint (M-10 - Public Protection Classification Report - ISO Rating.pdf) — where it was found ↗ first seen Oct 12, 2026
Data last updated October 15, 2026. Built from the archive's documents; see how the data is built.