Nashville Chemical

Legionella Risk Management-service

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 Legionnaires’ disease was first recognized in July 1976 following the mysterious outbreak at The American Legion convention in Philadelphia. Legionella bacteria are the waterborne pathogens that are responsible for humans contracting Legionnaires’ disease; a pneumonia-like sickness which has caused numerous illness outbreaks and, in severe cases death. According to the Centers for Disease Control and Prevention (CDC), between 8,000 and 18,000 people are hospitalized with Legionnaires’ disease in the United States each year. Legionnaires’ disease is a legitimate public health concern as its fatality rate during an outbreak ranges from 5% to 30% of those who contract the disease. The immediate consequences for a building owner or manager faced with liability claims and negative publicity can be devastating and very costly.

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While there is no current state or federal laws that dictate Legionella control and monitoring, most industry experts agree that proactively managing Legionella bacteria in cooling towers and water systems is more cost effective and safer for humans than responding to an out-break. Nashville Chemical recommends cooling tower owners and operators maintain an effective biocide program in conjunction with an appropriate deposit inhibitor program and periodic tower cleaning to help minimize the potential for an outbreak.  We believe Legionella-specific testing is the best measure of the potential threat a water system can be to humans. Once the test results are known, a plan of remediation can be engineered and executed, if needed.
There are numerous professional organizations which have published guidelines or protocol for the prevention of Legionella bacteria in cooling towers. The key to minimizing a potential outbreak is to institute a best practices water systems treatment program and to adopt an accepted protocol, and, if necessary, follow up with testing and sterilization.
  • The Centers for Disease Control and Prevention (CDC)
  •  The Association of Water Technologists (AWT)
  • American Society of Heating and Refrigeration and Air Conditioning Engineers (ASHRAE)
  • Cooling Technology Institute (CTI)
  • World Health Organization (WHO)
  • Joint Commission for Healthcare Facilities(JCAHO)
  • Occupational Safety and Health
  • Organization (OSHA)