For safety, if a secondary supply is required, what must the supply source be?

In situations requiring a secondary supply for fire operations, it is essential that the source be different from the primary supply. This ensures operational resilience and redundancy, reducing the risks associated with relying solely on one source. Should the primary supply become compromised or inadequate for any reason—such as contamination, failure, or depletion—the secondary supply can effectively support firefighting efforts without interruption.

Using a different supply source can also provide access to various water sources that may be more suited to specific conditions, including proximity, availability, and flow rate. Keeping the supply sources distinct enhances safety and ensures that resources remain available when they are most needed during a firefighting operation. Having two different sources is a critical strategy in suburban fire tactics, where water availability can vary due to infrastructure and environmental factors.