How often must an on-site operator visit a facility to ensure proper operation?

The correct answer is that an on-site operator must visit a facility daily to ensure proper operation. This frequent presence is essential for several reasons.

Firstly, daily visits allow the operator to monitor the system's performance closely, ensuring that all equipment is functioning correctly and efficiently. Water distribution systems can encounter various issues, including leaks, mechanical malfunctions, and changes in water quality, which may require immediate attention.

Additionally, daily checks facilitate timely adjustments to operational parameters, ensuring that the system complies with safety and health regulations. Regular monitoring helps to identify any potential problems before they escalate, which minimizes downtime and service interruptions. It also ensures that the water quality remains within acceptable standards, as operators can conduct necessary tests and assessments daily rather than waiting for longer intervals that might miss critical issues.

While other options suggest less frequent visits, such as weekly, monthly, or yearly, these intervals may not provide adequate oversight to maintain a safe, reliable drinking water supply. Hence, for effective water distribution management and compliance with regulatory requirements, daily visits are vital.