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: [email protected]

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

UKAS Accreditation

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

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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.