From New York to California, populations across the United States have an increased risk of a Legionnaires’ disease outbreak. Health officials are increasingly concerned about the continuous uptick of Legionnaires’ disease cases, which have risen steadily since 2000. While the waterborne bacterial disease is relatively rare ― with 6,238 cases nationwideso far this year ― there has been a 13.6 percent increase in cases since this time last year. That’s nearly double the increase of 7.8 percent from 2015 to 2016 in the same time period. The disease is not contagious. It’s contracted when people breathe in water droplets contaminated…