You may never have heard of Legionella pneumophila, but this airborne pathogen is one of the most dangerous bacteria found in untreated water systems—and it doesn’t enter your body the way most do.
Unlike E. coli or Giardia, Legionella spreads through the air—turning hot showers, faucets, and even humidifiers into potential health risks.
What Is Legionella?
Legionella is a naturally occurring bacterium found in low levels in freshwater lakes and streams. In nature, it usually poses little risk.
But in man-made water systems, like:
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Hot water heaters
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Cooling towers
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Decorative fountains
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Showerheads and faucets
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Hot tubs and spas
…it can multiply rapidly in warm, stagnant water, increasing to levels that pose a serious health threat.
The Origin of the Name
Legionella came to prominence in 1976, when an outbreak at a Philadelphia hotel sickened and killed dozens of attendees at an American Legion convention. Months later, researchers identified a previously unknown bacterium—and Legionnaires’ disease was named.
How Does Legionella Affect Humans?
Legionella bacteria cause Legionnaires’ disease, a severe form of pneumonia. It’s contracted not through drinking water—but by inhaling tiny, contaminated droplets suspended in the air.
At-Risk Situations Include:
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Taking hot showers
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Using hot tubs or spa baths
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Running water in sinks and taps
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Being near industrial cooling systems or fountains
High-Risk Groups:
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Adults 50+
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Smokers
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People with lung disease or weakened immune systems
Is It a Concern for Homes and Cottages?
Yes—especially for homes drawing untreated lake, river, or well water.
Even cottages with clean-appearing water are at risk if the plumbing system allows for heat buildup and stagnation. Once Legionella colonizes your hot water tank or pipes, it can be very difficult to eliminate without proper disinfection.
How Can I Detect Legionella?
Local water testing labs can detect Legionella quickly and affordably. If your home or cottage:
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Uses lake or river water
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Has a hot water system or water storage tank
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Hosts guests or renters
…testing is a wise first step.
UV Disinfection: The Smartest Line of Defense
While chlorine may help in some large-scale applications, UV disinfection offers a reliable, chemical-free way to neutralize Legionella—without altering your water’s taste, quality, or safety.
Why UV Works Best:
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Penetrates and destroys bacteria at the DNA level
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Requires no chemicals or additives
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Protects all water in your home, not just drinking water
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Offers continuous 24/7 protection with low maintenance
💡 Wyckomar UV systems are engineered to exceed the minimum UV Dose required to inactivate Legionella, giving you peace of mind in any season.
Protect Your Pipes—and Your Lungs
If your water is already contaminated with Legionella, you need a UV system immediately.
If your water is currently clean, a UV system ensures it stays that way.
Don’t let an unseen threat build up in your plumbing.
👉 Browse Wyckomar’s Whole-Home UV Systems
👉 Need help choosing the right system? Contact us today.
Read the Full Pathogen Profiles Series:
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Week 4: Legionella – The Lung Threat (You’re Here!)
