Legionella is known to cause Legionnaires' disease, which is a severe form of lung infection.
Bartram's Garden posted on its website that it was confirmed to them by the Philadelphia Water Department on Wednesday after testing.
Camden officials believe the contamination is likely the result of heavy rainfall seeping into underground storage tanks.
An investigation continues after more than a dozen drivers were stranded after pumping gas at a Conoco gas station in Camden, New Jersey.
About 20 to 30 million people get water from lead pipes in this country. Research shows even low levels of exposure can permanently alter brain development. We explore the crisis of safe drinking water in the U.S. and the solutions that are often tied up in bureaucratic red tape.
"Our America: Trouble on Tap" is a three-part documentary series produced in partnership with ABC News and National Geographic to raise awareness around access to safe drinking water in the United States.