A sixth person has died in connection with a Legionnaires’ disease outbreak on the Upper East Side, city Health Commissioner Dr. Alister Martin announced Tuesday.

The NYC Health Department says 90 people have tested positive for Legionnaires’ disease in the community cluster affecting the Carnegie Hill and Yorkville neighborhoods.

Of those cases, six people remain hospitalized, 65 have been discharged, 13 were not hospitalized and six have died.

Martin said health officials remain confident the source of the Legionella bacteria has been eliminated.

“We continue to believe the source of exposure has been eliminated,” Martin wrote on social media. “At this time, no one has reported new symptoms in over two weeks; no one has been diagnosed in over 10 days.”

The Health Department has tested 183 cooling towers at 160 buildings in the affected ZIP codes. Officials say 77 cooling towers at 75 buildings initially tested positive for Legionella, and 59 cooling towers at 58 buildings tested culture positive, confirming the presence of live bacteria.

All culture-positive cooling towers have been cleaned and disinfected, according to the Health Department. A total of 106 cooling towers have tested culture negative, while additional results remain pending.

The outbreak has drawn scrutiny from some elected officials, including City Council Speaker Julie Menin, who announced plans last week to hold an oversight hearing in September.

Menin called the city’s response to the outbreak “insufficient” and said officials need to examine how the investigation was handled.