Lifeguard Effectiveness: A Report of the Working Group is a publication of the National Center for Injury Prevention and the Centers for Disease Control and Prevention.
Each year, about 4,000 people die from drowning in the United States. Most drownings are preventable through such means as restricting swimming areas, posting warning signs, and fencing the perimeters of pools and waterways. Two important preventive strategies are providing lifeguards in public areas where swimmers frequent, and encouraging use of such protected areas.

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