Cobb County Fire and Emergency Services have received the highest Class 1 rating by the Insurance Services Office for the first time in its 45-year history.

ISO rates more than 48,000 fire-protection areas within the U.S. of which 178 are rated as Class 1 or one-third of 1 percent, according to a Cobb County statement released Tuesday.

The department now is one of 13 fire protection areas in Georgia to have a Class 1 rating.

Ratings under the ISO system range from 1, which marks superior fire protection, to 10, which indicates almost no fire protection.

Many insurance companies use ISO as a factor to access fire protection ratings and determine homeowner and business fire insurance premiums.

ISO ratings are based not only on the capability of fire departments but also the county’s water delivery system, 911 system and efforts in risk reduction such as fire prevention, public safety education and fire investigations.