The Fire Suppression Rating Schedule (FSRS) is the manual ISO uses in reviewing the fire-fighting capabilities of individual communities. The schedule measures the major elements of a community's fire-suppression system and develops a numerical grading called a Public Protection Classification (PPC™).
Ratings are 1 - 10, with 1 being the highest, or best, and 10 being the lowest, or worst.
Methuen’s I.S.O. Rating or Public Protection Classification is 3.