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The article describes a communitywide cryptosporidiosis outbreak in Utah in 2007. Chlorine resistance and the need for control measures are discussed. The increase in cases in 2007 is reported to mirror the increase in outbreaks associated with treated recreational water such as pools and water parks. Recommendations for preventing outbreaks are listed including pre-outbreak planning, adoption of a disease action threshold and implementation of control measures if the threshold is exceeded. Data from the Utah Department of Health is included along with control measures and their effectiveness.