The Granbury Volunteer Fire Department currently has an ISO rating of 3.
ISO is an independent organization that measures the quality of public fire protection on which insurance premiums are based.
ISO provides insurance companies, insurance regulators and fire departments, with the data they collect about fire risk in their communities.
ISO employees visit thousands of fire districts each year in effort to review the firefighting capability and adequacy of water systems in those communities. *ISO analyzes the relevant data and assigns a Public Protection Classification (PPC); A number from 1 to 10. Class 1 represent exemplary fire protection, and Class 10 indicates that the area's fire-suppression program does not meet ISO's minimum criteria.