The fundamental components of a modern water system are which of the following?

• A. Source, treatment plant, and storage
• B. Source, treatment plant, and means of moving
• C. Source, distribution network, and means of moving
• D. Source, storage, and distribution network

Answer: (B)

Water systems must provide clean water from a source, treat it to remove contaminants, and have a way to move that water through the system to customers. The treatment plant is needed to meet health and safety standards, turning raw source water into potable water. The source supplies the starting water, but without a means of moving—such as pumps, piping, and appropriate hydraulics—the treated water cannot reach storage facilities or the distribution network, and certainly not the users. Storage can help balance supply and demand, but it does not by itself deliver water or ensure quality. The combination of source, treatment, and means of moving captures the essential sequence: obtain water, make it safe, and convey it to where it’s needed. That’s why this option is the best fit.