More than a laboratory. A problem-solver.

Analyzing water samples specifically for Legionella is the only way to determine contamination of a source. You cannot see Legionella bacteria in water, and it can sometimes thrive in water systems of buildings, even in the presence of routine maintenance and biocide treatment. PathCon helps clients recognize maintenance and treatment failures in building water systems before exposure occurs and the disease is transmitted.

PathCon Provides:

Accurate Legionella Analysis


Accurate Legionella
Analysis that Exceeds ISO Standards

Outbreak Prevention Services


Effective Legionella Prevention Plans and Risk Assessments

Responsive Legionnaires’ Disease Outbreak Investigation


Responsive Legionnaires Disease Outbreak Investigation / Response

a2la accredited
AIHA Accredited Laboratory
Croatian Accredited

Why PathCon? Accuracy. Expertise. Specialization.

PathCon scientists are the leading experts in Legionnaires’ disease. As the first laboratory to offer Legionella testing services to the private sector, we have investigated outbreaks in the U.S. and many other parts of the world. In fact, two of our scientists have Legionella strains named after them. Legionella gormanii and Legionella feeleii were named after PathCon founding scientists Dr. James Feeley and George Gorman.

It’s just one indicator of PathCon’s depth and experience in the field of environmental Legionella detection and prevention. We were the first laboratory to associate levels of Legionella contamination with risk of disease transmission. PathCon’s hazard analysis and remedial action criteria have been adopted by OSHA as guidelines for evaluating levels of Legionella by water source (OSHA Technical Manual Section III: Chapter 7; Appendix III).

Recognized as one of the world’s most respected environmental health firms, PathCon Laboratories (USA) is A2LA accredited in Legionella analysis (A2LA Certificate 3056.01) and participates in the Public Health England Legionella proficiency testing program. PathCon has participated in the AIHA EMPAT (Environmental Microbiology Proficiency Analytical Testing) program since its inception in 1996 and is accredited by AIHA-LAP, LLC in the field of environmental microbiology for bacteria and fungi (Laboratory ID 102657).