What sign must be posted if a pool's operational permit is suspended?

When a pool's operational permit is suspended, the appropriate sign to be posted is "Pool Closed." This communicates clearly to patrons that the pool is not open for use due to safety concerns or regulatory issues that arise from the permit suspension. It is essential for the safety and well-being of the public that individuals are informed that swimming is not permitted until the issues causing the suspension are resolved. The "Pool Closed" sign ensures patrons do not enter the pool area, which could potentially lead to unsafe situations.

Other signs, while may imply closure or restricted access, do not convey the specific legal implications associated with a permit suspension. The "Pool Under Repair" could imply that the closure is temporary for maintenance, whereas "No Swimming" does not clearly indicate that the pool is closed. "Unsafe Pool" may convey a serious concern, but it lacks the official designation that comes with permit suspension. Thus, "Pool Closed" is the most accurate and legally mandated sign to indicate a suspension of operational status.