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The number of lifeguards a private event needs depends on sightlines and the number of swimmers, not on the size of the guest list. One guard can supervise a small, clearly visible pool. Add an L-shaped pool, a slide, deep planting around the edge or a hot tub out of view, and a single position can no longer see all the water at once. If any part of the pool cannot be seen from the guard position, that is the constraint, and a second guard is the answer.
Children change the calculation more than anything else. A party with a dozen young swimmers, excited and unfamiliar with the pool, is a substantially different supervision problem from the same number of adults, and it is worth being candid about the mix when booking rather than discovering it on arrival. Parents present are not a substitute for supervision, a distracted adult nearby is one of the more common factors in domestic incidents.
Book earlier than feels necessary for summer weekends, which are the busiest period by a wide margin. When arranging cover, confirm start and finish times against when guests will actually be in the water rather than when the event is scheduled, since swimming often begins before and continues after. Alcohol at adult events is worth raising too, because it materially changes the risk and the guard should know what to expect.
Reviewed by Jackie Stern, Lifeguard Instructor, Firefighter and EMT. Jackie Stern has taught lifeguarding for more than 20 years and works as a firefighter, EMT and swim instructor. She reviews course content, prerequisites and rescue standards against current certification requirements.