The department is investigating 30 recent cases of Legionnaires' Disease, a respiratory illness that most commonly spreads through the air of contaminated water systems.
One person has died from a Legionnaires' disease outbreak at the Sheraton Atlanta Hotel, as of Wednesday.
The emails were sent months before the governor said he learned of the outbreak and the possible reasons behind it.
New York City's health department has declared the outbreak over.
Failure to comply may cost a property owner as much as $25,000 in penalties.
Five more cooling towers in the South Bronx have tested positive for the legionella bacteria.
Portugal's Health Ministry has confirmed 302 cases of the disease, some suspect a local fertilization plant's cooling towers.