General ISO Ratings Summary – Effective January 1, 2016
- ISO CLASS 2: Addresses that are within 1000 feet of a fire hydrant AND are within 5 road miles of a 24-hour staffed fire station.
- ISO CLASS 3: Addresses not within 1000 feet of a fire hydrant BUT are within 5 road miles of a 24-hour staffed fire station.
- ISO CLASS 10W: Addresses that are within 1000 feet of a creditable water supply AND are within 5 to 7 road miles of a 24-hour staffed fire station.
- ISO CLASS 10: Addresses that are not within 1000 feet of a creditable waster supply AND are greater than 5 road miles of a 24-hour staffed fire station.
An interactive map to determine the ISO rating of a particular address is available here: ISO Map