Prairie Winds water park closed after three E. coli (STEC) cases linked to facility
Prairie Winds water park in Calgary closed after three STEC (E. coli) cases; Alberta Health Services orders cleaning, testing and public health advice.
The Prairie Winds water park in northeast Calgary has been closed after three confirmed cases of Shiga toxin–producing E. coli (STEC) were linked to the facility. Alberta Health Services (AHS) says people who visited the park between July 25 and August 4, 2026, may have been exposed to the bacteria, prompting a temporary shutdown and a public-health investigation. City crews began cleaning and testing the site as officials work to determine the source and prevent further illness.
Closure and exposure window
The City of Calgary announced the water park would be closed for one week beginning Friday, August 7, 2026, while AHS conducts an investigation and completes environmental testing. The decision follows confirmation of three STEC infections that public-health officials traced to patrons of the Prairie Winds attraction.
Photos and on-site observations from Saturday, August 8, 2026, showed workers in protective clothing power-washing and disinfecting spray features and surrounding surfaces. Officials say those measures are part of standard decontamination protocols while samples are sent for laboratory analysis.
Investigation, cleaning and testing
AHS said the closure will remain in place until investigators are satisfied that cleaning has been effective and water quality meets provincial standards. The agency is sampling water and surfaces at the park and reviewing maintenance and treatment records provided by the City of Calgary.
Authorities have not yet identified a single definitive cause, and investigators are examining possible contamination points including circulation systems, chemical treatment failures or behaviours that can introduce fecal bacteria into shallow play areas. Results from testing are expected to guide any additional remediation steps and the timeline for reopening.
Airdrie Chinook Winds spray park tests
Separately, the Chinook Winds spray park in Airdrie was closed after municipal water-quality testing returned bacterial counts far above provincial limits. AHS posted that samples taken July 28, July 31 and August 4 showed heterotrophic plate counts ranging from 1,500 to 2,440 colony-forming units per 100 millilitres, exceeding the Alberta standard of 100 CFU per 100 millilitres.
City officials in Airdrie said the spray park will remain closed through the weekend while they work with AHS to resolve the elevated counts. Municipal staff have been disinfecting equipment and assessing circulation and filtration systems to identify and correct the source of the contamination.
Health risks and symptoms of STEC infection
STEC bacteria spread when fecal matter containing the organism is ingested, often after contaminated hands touch the mouth or food. Infections commonly cause diarrhea, abdominal cramps, nausea and vomiting; most otherwise healthy people recover without hospital care, but dehydration is a frequent complication.
AHS warned that certain groups are at higher risk of severe illness, including young children, seniors and people with weakened immune systems. The same E. coli strain was associated with a large Calgary outbreak in 2023 that affected numerous daycare children, underscoring the potential for rapid spread in settings with young users.
Guidance from Alberta Health Services and municipalities
Alberta Health Services is urging anyone who visited Prairie Winds between July 25 and August 4 and who now has gastrointestinal symptoms to contact Health Link at 811 or see a primary care provider. The agency also recommends strict hand hygiene, avoiding sharing food or drinks with symptomatic individuals, and keeping anyone with diarrhea out of pools or spray parks for at least two weeks after symptoms fully resolve.
City of Calgary and Airdrie officials have encouraged residents to check municipal websites and social channels for reopening notices and testing updates. Both municipalities said they are cooperating fully with AHS and will follow any additional directives that arise from laboratory findings.
City staff have also emphasized routine preventive measures for families using spray parks and wading areas, including supervising children closely, ensuring diaper changes happen away from water features, and avoiding use of aquatic sites when ill. These practices reduce the chance of introducing pathogens into shallow, high-contact play environments.
Officials noted that routine water-management practices — including filtration, chlorination and monitoring — are designed to minimize bacterial risk, but they rely on proper maintenance and user behaviour. Where anomalies are detected, authorities have the statutory power to close facilities until corrective action and testing confirm safety.
Public-health officials continue to investigate the linked STEC cases and will update residents as new information becomes available. For now, both municipalities and AHS stress vigilance, prompt reporting of symptoms and adherence to hygiene guidance to limit further spread.
