Polish Sanitary Inspectorate warns of rising Legionella risk in summer water systems

The Chief Sanitary Inspectorate of Poland has issued a warning that Legionella bacteria thrive in water temperatures between 20 °C and 50 °C, making the risk of infection increase during the summer months. Infection typically occurs when people inhale water aerosol containing the bacteria, such as when showering, using a jacuzzi, or standing near a fountain, and can also happen through accidental ingestion of contaminated water. Human‑to‑human transmission has not been confirmed.

Legionella infection (legionellosis) has an incubation period of 2‑10 days and may begin with flu‑like symptoms such as high fever, muscle and head aches, and a dry cough, potentially progressing to gastrointestinal, neurological, or severe pulmonary problems. The inspectorate stresses that regular maintenance, proper supervision, and systematic checks of water installations—including public water supplies, showers, bathtubs with hydro‑massage, car‑wash systems, air‑conditioning units, and medical equipment—are essential to limit the threat. Ongoing inspections focus on public facilities, health‑care institutions, and collective‑housing buildings.