Legionella in Water

The history of Legionalla and its subsequent problem of Legionalla in water is as follows. In July 1976, there was an outbreak of pneumonia effecting 221 people attending the annual Pennsylvania American Legion convention at the Bellvue-Stratford Hotel in Philadelphia. Out of the 221 people infected, 34 died. It wasn't until December 1977 that microbiologists were able to isolate a bacterium from the autopsy of the lung tissue of one of the legionnaires. The bacterium was named "Legionella pneumonia" (Legionella in honor of the American Legion, and pneumonia which is Greek for "lung-loving") and was found to be completely different from other bacteria.
Typical sources of Legionella in water include industrial cooling towers, large ac systems, home hot water systems, fountains, and similar systems that use water and access it from the public water supply. Natural sources of Legionella in water include freshwater ponds and creeks. Many businesses and governmental agencies have developed guidelines for preventing or controlling the growth of legionella bacteria in water.
Unlike people with other pneumonia's, patients with legionnaire's disease often have severe gastrointestinal symptoms, including diarrhea, nausea, and vomiting. The US EPA has not set a MCL (maximum contamination level) for legionella water contamination, instead it has outlined the legionalla water treatment method which must be followed and the MCLG is 0 mg/l.
 

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Legionnaires' Disease Water Contamination News Nevada health authorities are investigating an outbreak of Legionnaires' disease that has been reported at the posh 4,000-room Aria Resort and Casino on the Las Vegas Strip. Four guests who stayed at the resort were treated for the bacteria-borne disease, but many more may have been exposed from June 21 to July 4. Source: ABC News

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Legionalla Water Treatment - Chemical oxidation-disinfection followed by retention, then filtration could be used. Since Legionella is a bacteria, Reverse osmosis or Ultrafiltration are the preferred Legionalla water treatment and removal techniques .