Legionella (Legionnaires’ Disease)

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Disease Reporting Line:
(808) 586-4586


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The Hawaii State Department of Health (DOH) investigated cases of Legionella on Oahu June 2018.  Legionellosis is caused by the bacterium, Legionella. People typically get sick 2-10 days after they breathe in tiny droplets of water in the air containing the bacteria. The bacteria can be found in many places in the environment, such as plumbing systems and hot water tanks, air-conditioning cooling towers, fountains, and whirlpool spas.

Read more about Legionella on our Legionella webpage

Hawaii Department of Health Legionellosis Factsheet (PDF)

Impact in Hawaii

Cases and outbreaks of legionellosis are often associated with hotels and resorts, long-term care facilities, hospitals, cruise ships and other structures that have large, complex water systems and use aerosol-generating devices. Nationally, over 20% of reported cases of Legionnaires’ disease are travel-related. People at increased risk for infection include;

  • Age ≥ 50 years
  • Smoking (current or historical)
  • Chronic lung disease such as asthma, COPD
  • Underlying illness such as diabetes, renal failure or hepatic failure
  • Immunocompromised due to disease or medications

What Can I Do?

Legionella can be found in the environment. The key to minimizing risk of legionnaires disease and reducing growth and spread of legionella is by periodic draining, cleaning and maintenance of water systems, shower heads, hot tubs, decorative fountains.

Information for Clinicians

What Clinicians Need to Know about LEGIONNAIRES’ DISEASE

Legionellosis is a Urgent category reportable disease in Hawai‘i. Hawaii Health Care Providers should report cases of legionellosis by calling (808) 586- 4586 followed by a written report Communicable Disease Report (PDF) by mail or fax to the Disease Investigation Branch or the applicable District Health Office within three days; respective mailing addresses and fax numbers are listed on the Communicable Disease Report form.

Last Updated

June 22, 2018