During a structural collapse, which utility should be shut off first?

Shutting off the gas utility first during a structural collapse is crucial due to the immediate dangers it presents. Gas lines can be ruptured during a collapse, leading to leaks that pose a significant risk of explosion or fire. Consequently, the presence of gas in the environment requires prompt action to prevent ignitable vapors from accumulating, which may ignite from any spark or flame in the vicinity.

While electricity also presents serious hazards, particularly related to electrical shock or further igniting of fires, it is the potential for a gas explosion due to a compromised supply that typically necessitates more immediate attention. Water and sewage utilities, while important to manage for other reasons, generally do not pose the same level of instantaneous danger in a structural collapse scenario. Therefore, prioritizing gas shutoff can greatly enhance the safety of both responders and survivors who may be trapped or present at the site.