In footage that appeared to have been filmed by the band themselves on social media, hundreds of fans were shown standing in close proximity to each other.
On Monday (27 July), Cuomo shared the clip to his Twitter in condemnation, revealing that the state’s health department would be launching an investigation into the event.
“Videos from a concert held in Southampton on Saturday show egregious social distancing violations. I am appalled,” he tweeted.
“The Department of Health will conduct an investigation. We have no tolerance for the illegal & reckless endangerment of public health.”
The Independent has contacted The Chainsmokers’ representatives for comment.
Hosted in the wealthy Hamptons area of New York, the concert was intended to raise money for a number of charities, with tickets reportedly ranging between $1,250 (£970) to $25,000 (£19,400).
Attendance required guests to fill an online Covid-19 questionnaire, wear a mask they were given upon arrival, and have their temperatures checked by staff.
The show was opened by DJ D-Sol, the onstage alter-ego of Goldman Sachs SEO David Solomon.