Rainwater left untreated in cooling towers atop city-owned Harlem Hospital fueled the Big Apple’s deadliest Legionnaire’s disease outbreak in a decade, the Rev. Al Sharpton charged Tuesday.

A law firm filed a lawsuit Aug. 20 against a New York City hospital’s construction company, alleging the company failed to treat bacteria-infected water in its cooling towers, leading to a Legionnaires’ disease outbreak.

The Legionnaires' disease outbreak in Harlem has been traced to 12 cooling towers, including several at city-run buildings, officials said.

Lawsuit filed after a deadly Legionnaires' outbreak in Harlem, alleging negligence by construction firms and NYC.

The final of 12 affected cooling towers in the Legionnaires' disease outbreak in Harlem was remediated on Friday. All 12 cooling towers in Central Harlem that tested culture positive for live Legionella bacteria have been fully drained,

Legionella, the bacterium that causes Legionnaires' disease, was discovered in 12 cooling towers on 10 Harlem buildings, including a city-run hospital and sex heal

A Legionnaires' outbreak in Harlem has prompted concerns about NYC's health oversight after a decline in cooling tower inspectors, despite funding increases. Former Governor Cuomo seeks an independent probe into the city's handling of the crisis.