436 Raising the Bar: Legionella Management & Industry Standards
Release Date: 09/05/2025
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448 2025 Halloween Special
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443 Industrial Water Week 2025: Cooling Wednesday
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442 Industrial Water Week 2025: Boiler Tuesday
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With those words, Jemma Tennant highlights one of the most profound differences between Legionella management in Europe and the United States. In this episode of Scaling UP! H2O, host Trace Blackmore welcomes Jemma Tennant, Chair of the Water Management Society (WMSoc), to explore how legislation, enforcement, and professional training shape the fight against Legionella.
Proactive Regulation and Duty of Care
The UK treats Legionella as a foreseeable and preventable risk. Jemma explains how laws like the Health and Safety at Work Act and COSHH Regulations require mandatory Legionella risk assessments, temperature monitoring, and written control schemes—even when no cases have occurred. This contrasts with the U.S., where ASHRAE 188 serves as guidance rather than enforceable law, often triggering enforcement only after outbreaks.
Jemma shares a case study where a housing association was fined £1.2 million despite no recorded illness, underscoring the UK’s proactive stance on protecting public health.
Hospitals, Design, and Emerging Challenges
From hospital plumbing layouts to new “waterless” intensive care units, Jemma details how design choices can either mitigate or magnify waterborne risk. Scotland’s model of involving water safety groups at the design stage provides a proactive example for healthcare worldwide. She also outlines how climate change, net-zero initiatives, and rising ambient temperatures are complicating control strategies across Europe.
Raising Standards Through Collaboration
As Chair of WMSoc, Jemma is leading efforts to raise industry standards and reverse what she calls a “race to the bottom.” She describes partnerships with AWT in the U.S. and LMAG in Australia to share expertise across borders. The episode also explores her pursuit of the Certified Water Technologist (CWT) credential and her vision for adapting the certification for UK professionals.
Conclusion
This conversation is a call to action for water treatment professionals everywhere: regulations, standards, and collaboration matter. Whether in cooling towers, hospitals, or housing estates, Legionella management requires vigilance, shared knowledge, and a commitment to raising the bar. Listen to the full episode and discover how global collaboration can shape safer water management practices.
Stay engaged, keep learning, and continue scaling up your knowledge!
Timestamps
01:55 - Trace Blackmore introduces the final installment of Legionella Awareness Month 2025
05:30 - Water You Know with James McDonald
07:30 - Upcoming Events for Water Treatment Professionals
14:50 - Interview with Jemma Tennant, SMS Environmental, Chair of the Water Management Society (WMSoc)
15:24 - Jemma’s background: growing up in the U.S. and UK, science upbringing, rotifers, and wastewater treatment career.
32:25 - The Water Management Society: structure, training, collaboration with AWT and LMAG
43:00 - Raising industry standards: combating the “race to the bottom” in UK water treatment.
Quotes
“In the UK, we’re prosecuted for the potential for harm, not just actual harm. Legionella is treated as a foreseeable and preventable risk.”
“It’s the transition between just doing the task to understanding the why behind the task.”
“We’re seeing a serious drop in industry standards—a race to the bottom—and that’s why raising the bar is so important.”
“At the end of it, the CWT covers everything. You end up being a complete water treater.”
“Always be honest when you don’t know the answer, then go and learn. That’s how you grow.”
Connect with Jemma Tennant
Phone: 447828315336
Email: j.tennant@sms-environmental.co.uk
LinkedIn: https://www.linkedin.com/in/jemma-tennant-mwmsoc-2636985b/
Guest Resources Mentioned
Water Management Society (WMSoc)
LMAG - Legionella Management Advisory Group - LMAG
The Women by Kristin Hannah (Author)
HTM 04-01 – UK healthcare water safety standards
The Control of Substances Hazardous to Health Regulations 2002 (COSHH Regulations 2002)
Health and Safety at Work etc Act 1974
ANAB (US Laboratory Accreditation)
Scaling UP! H2O Resources Mentioned
AWT (Association of Water Technologies)
ANSI/ASHRAE Standard 188-2021 for Legionnaires’ Disease Risk Management
ASHRAE Standard-188-2021, Building Water Management Plans – Summary
Scaling UP! H2O Academy video courses
Ep 101 The One with Colin Frayne, CWT
Ep 203 The One With Our Across The Pond Legionella Expert, John Sandford
Ep 370 Unlocking Legionella Solutions: Perspectives on Regulations and Best Practices
Water You Know with James McDonald
Question: Does Hydroxide Alkalinity in a steam boiler water ALWAYS equal 2P-M?
2025 Events for Water Professionals
Check out our Scaling UP! H2O Events Calendar where we’ve listed every event Water Treaters should be aware of by clicking HERE.
