Which list correctly identifies the six vulnerable critical water system components?

• A. Source, treatment, storage, distribution, transmission, and support systems.
• B. Source, treatment, storage, distribution, and transmission.
• C. Source, treatment, storage, and distribution.
• D. Support source systems.

Answer: (A)

The idea here is recognizing all the places in a water system where vulnerability can impact safety and reliability. A complete view includes not only the main stages water goes through but also the infrastructure that keeps those stages operating. The six vulnerable critical water system components are source, treatment, storage, distribution, transmission, and support systems. Source is where water enters the system; treatment removes contaminants; storage holds treated water; distribution moves water to customers; transmission carries water between facilities and across larger distances; and support systems provide the power, control, and communications needed to run everything (pumps, SCADA, electrical supply, etc.). Without any one of these, the system can falter—the others won’t matter if power fails, controls fail, or the network can’t move water. That’s why the option listing all six is the best match. The other options omit one or more components, making them incomplete.