Water quality analysis - Legionella species testing (bathtubs, cooling towers, humidifiers, etc.)

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last updated：Jul 15, 2025

内藤環境管理

We will assist you in maintaining and managing your equipment through Legionella testing!

Legionella bacteria, when they infect humans, cause an infectious disease known as Legionnaires' disease. In nature, they are found in small amounts in soil and freshwater, but the likelihood of direct infection from these sources is almost nonexistent. However, conditions in bathtubs and cooling towers are conducive to the proliferation of Legionella bacteria, so even a small aerosol (water spray) can contain a large number of Legionella bacteria, which can lead to infection when inhaled. Legionnaires' disease is an infection caused by inhaling aerosols contaminated with Legionella bacteria. Its symptoms can be broadly categorized into Legionella pneumonia and febrile illnesses resembling influenza. Individuals with weakened immune systems, such as the elderly, the sick, and infants, are at higher risk of developing the disease, so facilities used by these populations require higher hygiene management compared to other buildings. Additionally, measures against Legionella are important due to their growth characteristics, making the removal and prevention of biofilm formation crucial. For more details, please contact us or refer to the catalog. Related link: http://www.knights.jp/ana/water/bact_legiindex.html

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【Facilities to Note】 Water supply facilities, hot water supply facilities, bathing facilities, cooling tower facilities, humidifiers, heat storage tanks, water feature facilities, and other facilities where aerosols (water splashes) are likely to occur. 【Standard Values】 Bathing water: Should not be detected (Guidelines on water quality standards in public baths, Ministry of Health, Labour and Welfare) *In some prefectures, the notation may be "not detected/100 mL." Cooling water: Less than 100 CFU/100mL (Guidelines for preventing Legionnaires' disease, Japan Architectural Hygiene Management Education Center) *Although it is not a standard, if it exceeds 100 CFU/100mL, immediate cleaning and disinfection measures must be taken, and after implementing these measures, it must be confirmed that the detected bacterial count is below the detection limit (less than 10 CFU/100mL). Legionnaires' disease is classified as a Class IV infectious disease under the Infectious Disease Control Law, and the diagnosing physician is obligated to report it immediately to the health department. In some prefectures and designated cities, the obligation to report to the health department may arise as soon as Legionella bacteria are detected, even if there are no reported cases of infection.