At what depth is a commercial pool required to have at least one lifeguard on duty?

In the context of commercial pools, having a lifeguard on duty is a critical safety requirement, particularly as the depth of the water increases. The standard requirement for lifeguard supervision typically begins at a depth of 3 feet. This depth marks a significant point in terms of safety because it is shallow enough that many patrons, including children, may be swimming, but it is also deep enough that there could be risks associated with drowning and other aquatic emergencies.

Having a lifeguard present can help ensure that swimmers are monitored effectively and can provide immediate assistance in case of accidents or emergencies that might occur in deeper water. The 3-foot threshold reflects a balance between safety needs and the reality that most facilities will not have lifeguards at every inch of pool depth but will focus on the areas where supervision is most critical. Thus, the requirement for lifeguards ensures proper monitoring and rapid response to any incidents that may arise in depths where people are more likely to be swimming or playing.