The Jean Edmonds Tower in Ottawa now has Legionella bacteria levels that are “well within safe levels” according to a recent article in the Ottawa Citizen.
The building underwent testing on June 12 after an contracted employee with Citizenship and Immigration Canada had contracted Legionnaires’ disease.
According to the test results, Legionella were not detected in two of the tests, while the other six tests were found to have less than 25 cfu/mL (cfu = colony forming units).
The Public Works and Government Service Canada indicates that Legionella levels below 100 cfu/mL are acceptable and the Ontario Public Health says that if Legionella levels ever exceed 1,000 cfu/mL, immediate action must be taken.
These figures are quite different from recommendations in the United States. OSHA’s suggested guideline is that “[Legionnaires’ disease bacteria] concentrations in cooling towers, evaporative condensers, and fluid coolers” should remain below 10cfu/mL.
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