Health officials have said that two of the theme park’s cooling towers were to blame for the incident.
The mist is sprayed out to keep park-goers cool on hot days.
Dr Matthew Zahn from the Orange County Health Care Agency testified before an appeals board on Tuesday in California.
Disney is currently trying to overturn a $33,000 (£25,000) state fine in relation to the outbreak of illness.
It said that the source of the outbreak hasn’t been scientifically proven.
Tests done in the park showed high levels of the Legionella bacteria inside two cooling towers in the Anaheim park.
The bacteria grows in man-made water systems as well as air conditioning units, which means they have to be maintained often and kept clean.
Disneyland is full of cooling systems like these because California is so hot and sunny.
Dr Zahn said that he couldn’t be 100 per cent certain that Disneyland was the source of the illness and that more tests would be required.
The illness is a severe form of pneumonia and can be fatal. It also causes flu-like symptoms and severe chest pains.
It can be treated with antibiotics in most people, but can be deadly to the elderly or those who don’t have good immune systems.
Three employees at the park came down with the disease, two needing hospital treatment.
22 people across California contracted Legionnaire’s in the outbreak, killing one person.
Disney spokesperson Suzi Brown said: “The facts don’t support these claims and the lawsuit has no merit.”
Sun Online Travel previously revealed that a guest is suing Disneyland after she said she was bitten by bedbugs at one of its hotels.
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