On a Class A POTW, at least one operator on each shift must hold a minimum wastewater operator license of what class?

• A. Class B
• B. Class A
• C. Class C
• D. Class D

Answer: (A)

For a Class A POTW, on each shift there must be at least one operator who holds the highest level of wastewater operator license. This is because Class A facilities are the most complex and demanding to operate, requiring someone on duty who is fully qualified to supervise all processes, troubleshoot issues, ensure regulatory compliance, and respond to emergencies. A Class A license demonstrates the depth of knowledge and authority needed to safely and effectively run a large, high‑risk treatment plant. Lower-class licenses (B, C, or D) do not meet the requirement for the on‑shift qualification at this level, since they do not authorize the full scope of operations oversight that Class A entails.