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Agency Testimony

Commissioner Martin explains Legionnaires' disease and cooling tower mechanics

New York City Council · Sep 2, 2026 · starts 0:50:04 · 1 min 37 sec

Martin explains Legionnaires is pneumonia caused by Legionella bacteria in warm water, contracted by inhaling contaminated mist from cooling towers. He notes climate change is increasing risk with longer hotter summers.

Commissioner Martin

As the city's doctor, let me first explain what Legionnaires disease is and is not.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Commissioner Martin

Legionnaires disease is a serious form of pneumonia caused by Legionella bacteria that are ubiquitous in our environment and grow quickly in warm water.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Commissioner Martin

It does not spread from person to person.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Commissioner Martin

It is contracted by inhaling mist, a water vapor that contains Legionella bacteria, which moves invisibly through the air.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Commissioner Martin

People who are over the age of 50, people who smoke, and people who have certain chronic diseases or compromised immune systems are at greater risk.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Commissioner Martin

Legionnaires disease is very

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Commissioner Martin

effectively treated with antibiotics when it is diagnosed early.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Commissioner Martin

Especially in the summer months when we experience higher temperatures, Legionella bacteria can grow easily in cooling towers, often located on top of buildings.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Commissioner Martin

With climate change, New York City is experiencing longer, hotter summers and more frequent and intense heat waves every year.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Commissioner Martin

And that increases the risk of legionella growth in cooling towers.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Commissioner Martin

It's important to note that cooling towers are separate from indoor plumbing and potable water.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Commissioner Martin

Cooling towers are mostly used to remove heat from buildings and cool equipment.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.

Member of the Public - Valerie Mason

They should have as much information as those who are comfortable with it.

Commissioner Martin

While towers operate, they release mist into the open air outside.

Member of the Public - Valerie Mason

If you live or work in a building with a cooling tower, your landlord should be required to notify you.

Commissioner Martin

If the cooling tower is contaminated, that mist may actually carry Legionella bacteria.

Member of the Public - Valerie Mason

New Yorkers are some of the most vigilant people on earth.

Member of the Public - Valerie Mason

I know if they know what the reporting requirements are, they will make sure that their landlords are following them.

Commissioner Martin

All of the evidence indicates that that is what happened this summer.

Member of the Public - Valerie Mason

We were overwhelmed with inquiries about whether people should be able to go to the Upper East Side.