In July and August 2012 Minnesota Department of Health staff identified two laboratory confirmed cases of cryptosporidiosis. Both cases had played in a splash park in Waite Park in the 2 weeks prior to illness onset. Report dates were July 23, 2012 and August 10, 2012. Both cases had Cryptosporidium parvum subtype BGP18 identified in stool samples. A sibling of one of the cases also tested positive for Cryptosporidium. While this child had also been at the splash pad, she did not become ill until 15 days later, and thus was classified as a secondary case.

Health department investigators concluded that an infectious splash pad user most likely introduced the parasite into the water.