Organization's Website Mission: Swimming is a fun, active and healthy way to spend leisure time. However, in the past two decades there has been an increase in the number of Recreational Water Illness (RWI) outbreaks associated with swimming pools, water parks, hot tubs, lakes, rivers and oceans. The Centers for Disease Control and Prevention's (CDC) Healthy Swimming program offers information and resources to raise awareness about RWIs and how to prevent them by practicing "Healthy Swimming" behaviors.