Which of the following is important for ensuring the safety of a water distribution system?

Periodic infrastructure upgrades are crucial for ensuring the safety of a water distribution system because they allow for the refurbishment or replacement of aging pipes, valves, and other components that may be susceptible to leaks or failures. Over time, materials can degrade, leading to the potential for contamination, structural deficiencies, and reduced service reliability. Upgrading infrastructure can also incorporate advancements in technology and materials that enhance the overall safety and efficiency of the system.

In contrast, other approaches like eliminating all underground pipes is impractical, as many systems rely on buried infrastructure for distribution. Only using plastic materials may not be suitable for all applications, as different materials serve specific functions and provide varying levels of durability and resistance. Lastly, constantly lowering water pressure can be detrimental, as it might lead to insufficient supply or increased likelihood of contamination through backflow.