NYC Legionella inspections rose only gradually before latest Legionnaires' cluster in Manhattan

Key Points:

• City inspections of cooling towers in New York, crucial for preventing Legionella bacteria spread, have only slightly increased in 2026 compared to near record lows last year, with over 20% of buildings failing to submit required test results so far this year.
• A new cluster of at least 14 Legionnaires’ disease cases has been identified on the Upper East Side amid a severe heat wave, prompting health officials to inspect all cooling towers in affected neighborhoods and warn residents of the potential spread.
• Despite doubling the number of inspectors, the city's health department has inspected only about 1,306 of nearly 6,000 cooling towers since the start of 2026, far below the annual inspection goal and significantly less than inspection rates in previous years.
• New testing regulations require building owners to test cooling towers for Legionella bacteria every 31 days during warmer months, but compliance remains uncertain, with one in five towers lacking submitted test results as of May 21.
• The 2025 Harlem outbreak was traced to two city-owned properties with poorly maintained cooling towers, highlighting ongoing challenges in enforcement and the critical need for both health department oversight and building owner diligence to prevent future outbreaks.