In emergency services, mutual aid is a agreement among emergency responders to lend assistance across jurisdictional boundaries when required. This is usually in an emergency that exceeds local resources, such as a disaster or a multiple-alarm fire, and in this case may be ad hoc, requested only when such an emergency occurs. It may also be a formal standing agreement for cooperative emergency management on a continuing basis, such as ensuring that firefighters are dispatched from the nearest fire station, regardless of which side of the city limit the fire (or the caller reporting it) is on. On a smaller scale, the principle of mutual aid guides the creation of militia and community emergency response teams, such as volunteer fire departments.

Industrial mutual-aid organizations

• Calvert City Industrial Mutual Aid Program (CIMAP)
• Channel Industries Mutual Aid (CIMA)
• Chocolate Bayou Mutual Aid (CBMA)
• Louisiana Emergency Resources Supply Network (Hired Gun Gang)
• Mutual Aid Mont Belvieu (MAMB). Retrieved on 2007-07-01..
• Petrochemical Mutual Aid Organization (PMAO), San Francisco Bay Area. Retrieved on 2007-07-01..
• South Baltimore Industrial Mutual Aid Plan (SBIMAP)
• Southwest Louisiana Mutual Aid Association. Retrieved on 2007-07-01..
• Southeast Texas Mutual Aid Group (SETMAG)
• Southern California Industrial Mutual Aid Organization (SCIMO). Retrieved on 2007-07-01..
• Texas City Industrial Mutual Aid System (IMAS)
• Toledo Mutual Aid Association (TMAA)