Legionella and Legionnaires' Disease

Legionella is a type of bacteria that can cause a severe, often lethal form of pneumonia known as Legionnaires' disease in persons at risk. Within the last decade, Legionnaires' disease has been reported throughout the world. Outbreaks have been linked to buildings with large or complex water systems that are improperly maintained. It is most often found in hot water tanks and heaters, large plumbing systems, faucets and showers, decorative fountains and cooling towers (air conditioning units).

The potable water systems in student housing, gymnasiums, stadiums, ice arenas, student recreation buildings, facilities buildings, research centers, ag research buildings, performing arts centers, dining halls and kitchens, aquatic centers, campus laundry, campus inns and hotels, fire houses, police stations, and other facilities are major sources of Legionella.

 

Standards of Care

A Standard of Care is defined as acknowledged applicable laws, standards and guidelines. Following a Standard of Care can minimize the risk of scald injury, Legionella-related illness and the associated litigation. OSHA (1998), ASHRAE Guideline 12-2000, ASHRAE Standard 188-2015 and VA Directive 1061 (2014) are Standards of Care which include critical recommendations for establishing and monitoring hot water system temperature control limits.

 

ASHRAE Guideline 12-2000

4.1.6 RECOMMENDED TREATMENT. Hot water stored above 140°F (60°C), minimum recirculated return 124°F (51°C).

 

ASHRAE Standard 188-2015 Legionellosis: Risk Management for Building Water Systems

6.1.3 CONTROL LIMITS. Establish limits within which a chemical or physical parameter must be monitored and maintained.
6.1.4 MONITORING. Establish a system for monitoring the parameters associated with the control limits established in 6.1.3.
6.1.7 DOCUMENTATION AND RECORDKEEPING. Establish documentation and maintain records.