Which of the following is a requirement for inspectors regarding plumbing systems?

Inspectors are required to check for proper drainage systems as part of their assessment of plumbing systems. This involves ensuring that the drainage mechanisms are functioning correctly, preventing backups, leaks, and other potential issues related to water flow. Proper drainage is crucial because it directly impacts the overall functionality of the plumbing system, affects water quality, and plays a significant role in maintaining the integrity of the property being inspected.

While determining the efficiency of the plumbing system, inspecting decorative features, and evaluating aesthetic conditions might be relevant topics in certain contexts, they do not constitute essential requirements for plumbing inspections. The primary focus is on ensuring that the system is safe, functional, and compliant with local standards, with proper drainage being a critical component in achieving this goal.