Danger from the Tap? How Dangerous Legionella Really Are and How You Can Protect Yourself
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Legionella are bacteria that live in warm water. In Germany they are frequently found in drinking water systems, for example in showers, taps, or hot water tanks. Many people therefore wonder whether water from the pipes can be dangerous. The bacteria are not unusual in small quantities. However, they can cause severe pneumonia, known as Legionellosis or Legionnaires' disease.
The infection usually does not arise from drinking water. The main danger comes from fine water droplets that are inhaled, for example when showering or using a whirlpool. People who are particularly at risk include older adults, smokers, people with a pre-existing lung condition, and people with a weakened immune system. For healthy adults, the overall risk is low. The disease is not transmissible from person to person.
To reduce the risk, experts recommend several simple measures. Hot water tanks should be set to a temperature of at least 60 degrees, because Legionella multiply readily at temperatures below 50 degrees. Anyone who has been away for a long time or has a rarely used pipe should let the water run for a few minutes before use. Shower heads can be descaled and cleaned regularly. For larger buildings with a central hot water supply, the Drinking Water Ordinance prescribes mandatory checks for Legionella. Tenants who are uncertain can contact their landlord or the responsible public health office.
In summary, while Legionella can be dangerous, the risk for most people in Germany is low. Anyone who pays attention to the correct water temperature and uses pipes regularly can protect themselves effectively. If symptoms such as a fever that persists for a long time, coughing, or breathing difficulties occur, one should see a doctor promptly and mention possible contact with warm water.
Sources: MDR.de
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