What is the highest number of alarms in a fire?

The highest number of alarms in a fire typically refers to the level of response from firefighting services, often categorized by alarm levels. In some jurisdictions, a multiple-alarm fire can reach levels as high as 5 alarms or more, with each additional alarm indicating the need for more resources and personnel. Notably, major incidents can escalate to 10 alarms or beyond, depending on the scale and complexity of the fire. These higher alarm levels represent significant challenges and require extensive coordination among multiple fire departments.