The Ottawa Hospital has temporarily turned off the water in certain units at its General campus after confirming a case of legionellosis. As a precautionary measure, water service was suspended the morning of Sept. 21 after a patient was diagnosed with legionellosis — the broad term for a number of diseases, including legionnaire's disease, caused by the water-borne legionella bacteria. Service was suspended Monday on floors four through eight as the water system at the campus underwent a "hyperchlorination process," the hospital said.