Since 1981 we have quantitatively tested thousands of samples for legionella from water-containing mechanical equipment and plumbing lines. Contact us to receive our test agreement, chain of custody form, and sampling instructions for legionella bacteria testing. Turnaround time is usually three business days. gtslegionellatestinglab.
Why Test for Legionella?
Legionella testing validates whether your legionella control procedures are working.
NAS Management of Legionella in Water Systems is the best reference.
National Academies of Sciences, Engineering, and Medicine 2019. Management of
Legionella in Water Systems. Washington, DC: The National Academies Press.
There are no federal regulations specifying permissible numbers of legionella in water systems. There are numerous legionella guidelines (a.k.a. standards) in the United States: AIHA, APIC, ASHRAE, AWT, CTI, NSF, CDC, EPA, OSHA, CMS, and VA.
Much effort and time can be wasted by simply monitoring physical and chemical parameters of building water systems without routine legionella testing of aerosol-producing warm water-containing sources such as cooling towers, spas, fountains, and hot water holding tanks.
When numbers of legionella in a water sample are significant, we suggest decontamination of water systems using industry-standard procedures such as the State of Wisconsin Department of Health Guidelines as modified by the Cooling Technology Institute. AIHA, APHA, ASHRAE, CDC, EPA, NSF International, and OSHA have similar decontamination procedures.
GTS Legionella Test Method:
We use the gold standard quantitative direct fluorescent monoclonal antibody (DFA) test for 14 serogroups of Legionella pneumophila and 15 other Legionella species associated with human disease.
Why We Don't Use the Culture Method:
EPA declined to add Legionella tests to the water testing laboratory certification program in the early 1980s.
Legionella on BCYE agar media are often overgrown or inhibited by competing microbial flora that mask the presence of legionella colonies, particularly with water samples taken from warm water-containing mechanical equipment exposed to the environment such as fountains, cooling towers, and saunas.