SAN DIEGO (FOX 5/KUSI) -- A low level of Legionella was detected in one of the inpatient units at Rady Children's Hospital. On Sunday, Rady's released a statement saying that "as a precautionary measure, the hospital is taking steps to sanitize the water system to remove any infection risk." L egionella is a common bacteria found in water that can cause two lung diseases: Legionnaires' Disease, a type of serious pneumonia, as well as Pontiac Fever, a mild respiratory disease. 9-year-old-girl dies after dental procedure performed at Vista office The San Diego children's hospital confirmed the water supply returned to normal Monday morning after starting the disinfection process overnight. Legionella typically poses little risk to healthy individuals, according to Rady's. ...read more read less