The Centers for Disease Control and Prevention (CDC) released a report January 12, 2026, examining a cryptosporidiosis outbreak linked to a Georgia water park, highlighting how modern disease surveillance helped public health officials quickly detect and investigate the incident.
Cryptosporidium — often called “Crypto” — is a chlorine-tolerant microscopic parasite that causes the diarrheal illness cryptosporidiosis and is commonly spread through contaminated drinking or recreational water. According to the CDC, “cryptosporidium is the leading cause of waterborne disease among people in the United States.”
The outbreak occurred in Houston County, Georgia, in the summer of 2018 after a newly constructed water park opened. The CDC said the Georgia Department of Public Health’s North Central Health District had warned the owner about crypto risks during planning stages, but the park ultimately opened in July 2018.
Local environmental health staff learned the facility was opening after seeing a social media announcement from the owner on July 5 stating that the park would open the following day. Officials knew the attraction had not yet obtained required state permits, though they worked with staff to ensure pools were maintained before the opening.
The first illness complaints surfaced about a month later. On August 8, 2018, the North Central Health District was notified that water park guests had reported gastrointestinal illness to the facility manager, who passed the information along to health officials.
Epidemiologists from the Georgia Department of Public Health reviewed syndromic surveillance data — electronic monitoring of hospital symptom reports — to search for possible cases. By the morning of August 9, the system had identified two potential infections. By the end of the day, those two cases were laboratory confirmed, two additional cases were awaiting lab results, and two more were epidemiologically linked to the confirmed infections.
Health officials temporarily closed the water park while operators raised chlorine levels to address possible contamination. The facility was allowed to reopen on August 11.
The CDC said the investigation ultimately identified 119 potential cases among people who had visited the park in July or August 2018 and experienced diarrhea lasting at least two days. Twenty infections were laboratory confirmed — 17 of which were first identified through syndromic surveillance — while the remaining 99 were linked through case contacts or survey responses. At least 47 people sought medical care, and four were hospitalized.
The park was later shut down two more times during the investigation because infected individuals continued to visit the facility while still contagious. Officials also temporarily closed an apartment complex pool, a community pool, and a splash pad visited by symptomatic swimmers. Those facilities were hyper-chlorinated and did not report additional outbreaks.
The CDC said the investigation demonstrated the value of modern surveillance tools, noting that “the ability to rapidly detect potential cases through syndromic surveillance within the first week of the outbreak prompted health officials to expand the dates of concern and to investigate additional recreational water facilities.”
Since the outbreak, the water park has added secondary disinfection systems on new water features and increased signage reminding guests not to swim while ill. Public health officials also incorporated syndromic surveillance more routinely into their outbreak response efforts.
