Outbreaks associated with treated recreational water — United States, 2015–2019

This article describes 208 outbreaks associated with recreational water exposures in the U.S., the majority of which were due to either Cryptosporidium or Legionella infections and were primarily reported after exposure to public (i.e., nonbackyard) recreational water. These outbreaks resulted in 3646 cases of illness, 286 hospitalizations, and 13 deaths; all deaths were due to Legionella infection. Most outbreaks began between June and August each year, suggesting that solid organ transplant candidates and recipients should be mindful of the risks associated with public recreational water, particularly during the summer months.