As of July 30, there were 92 cases and seven deaths, primarily affecting three ZIP codes, including the neighborhoods of Carnegie Hill and Yorkville. At least 79 people were hospitalized and five remain in the hospital, the department said.
Health Commissioner Dr. Alister Martin says the source of the community cluster has been eliminated.
"We can confidently close this phase of our response because the incubation period being the stretch of time during which new illnesses can rise has passed," Martin said. "Legionnaires' disease has a 14-day incubation period, within that time frame, we have seen no new cases."
A health department investigation led to 83 buildings being ordered to clean and disinfect their cooling towers. Fifty-nine cooling towers tested positive for live Legionella bacteria and 124 tested negative, according to the department.
Inspections by the city found two cooling towers on the Upper East Side with "significant maintenance failures" including one that had never been registered with the city and was operating illegally, the department said.
Those buildings were identified as 300 East 83rd Street and 1520 York Avenue. The building on 83rd Street was fined $11,000 for having an unregistered cooling tower.
Officials are continuing to investigate the source of exposure to the Legionella bacteria associated with the cluster.
The department said the NYC Public Health Laboratory is comparing bacterial samples from patients with samples from cooling towers that tested positive.
Results from the sequencing analysis are expected by the end of August.
(ABC News contributed to this report.)
----------
* Get Eyewitness News Delivered
* More New York City news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Download our connected TV app