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Legionella

Projects

Health
Biological activity
ProVe IT-LT: Proven Safe and Innovative Hot Tap Water at Low Temperature

A low temperature (LT; 50 °C) in heating networks offers various advantages, such as reduced heat loss during heat distribution. Moreover, a low supply temperature is also increasingly…

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Health
Biological activity
Risk of L. pneumophila with heating networks

In this project, a qualitative microbiological risk analysis is being conducted to determine the effect of using heating networks for domestic connections on the number of patients with L. pneumophila. In addition, we…

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Health
Biological activity
Biological stability parameters in operational practice

New methods for determining and predicting biological stability developed since 2010 are applied less often in daily drinking water practice than are the previously existing older methods. This,…

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Health
Biological activity
Risk of opportunistic pathogens in drinking water

The water utilities have indicated that research into opportunistic pathogens in drinking water has a high priority. This is because these pathogens could represent a potential health risk. This project’s priority is…

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Health
Safe innovation and the water sector
Evaluation of Legionella regulations in systems for drinking water and warm tap water

The aim of this project is to determine whether current scientific understanding justifies amendments to the regulations on Legionella prevention in mains water systems and, if so, how…

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Health
Biological activity
Drinking water biological stability in relation to temperature

The law establishes that drinking water temperature must be under 25°C. However, there aren’t any, or hardly any, measures available to actually keep the water temperature below this…

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Health
Microbial safety
KWR to advise the State of Michigan in Flint research dispute

In October 2017 KWR conducted a scoping mission for the State of Michigan in the US to get a clear idea of the status of the multidisciplinary project,…

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Enabling technologies
Innovative water treatment technologies
Legionella control in the tropics

Legionella pneumophila, the main cause of legionnaires’ disease, multiply primarily in aqueous environments at temperatures between 30 and 45°C. Under these conditions, in certain water systems with aerosolization, L. pneumophila can grow in the system and be…

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Health
Biological activity
Oportunistic pathogenic microorganisms in drinking water

Because of the expected climate change, it is probable that in the future the earth’s warming will lead to a rise in the temperature of surface water, water…

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Sustainability
Climate change and resilience
Future temperature in the distribution network under the impact of urbanisation and climate change

Water temperature at the pumping station has limited impact on the temperature at the tap, but groundwater temperature does have a strong impact. If ground temperatures increase because…

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Experts

Prof. Gertjan Medema PhD
Principal microbiologist
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Prof. Gertjan Medema PhD

Principal microbiologist

Gertjan Medema is Principal Microbiologist at KWR. He is also part-time professor of Water & Health at Delft University of Technology, and Distinguished Hannah Visiting Professor at Michigan State University.…

030-6069653

Gertjan.Medema@kwrwater.nl

06-25032597

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Frank Oesterholt MSc
Senior scientific researcher
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Frank Oesterholt MSc

Senior scientific researcher

Frank Oesterholt is a senior researcher and project manager in the Energy & Circular Systems team. His specialities are process water treatment, water reuse and water loop closure. For example,…

030-6069575

Frank.Oesterholt@kwrwater.nl

06-21507897

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Paul van der Wielen PhD
Senior scientific researcher
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Paul van der Wielen PhD

Senior scientific researcher

Paul van der Wielen is Principal Scientist in the field of (micro)biological activity in water in man-made water systems, and a member of KWR's Scientific Council. He is also guest…

030-6069642

Paul.van.der.Wielen@kwrwater.nl

06-25241293

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News

News

First edition of Guide for Legionella Prevention in biological wastewater treatment plants is made public

29 July 2022 — The Ministry of Infrastructure and Water Management recently made available, via the Informatiepunt Leefomgeving (IPLO) website, the Guide…

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News

KWR recommendation leads to downscaling of standard for legionella

24 May 2022 — KWR's advice on adjusting the Legionella standard will be incorporated into the Dutch Drinking Water Directive.

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News

New Legionella regulations to be rooted in latest scientific understanding

06 December 2021 — Scientific research into Legionella has yielded many new insights over the past twenty years that are now being…

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News

Joint Research Programme/WiCE and STOWA study use of viruses against Legionella in wastewater streams

16 September 2021 — Within the Joint Research Programme-WiCE (Water in the Circular Economy) programme, KWR and STOWA are studying the extent…

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Water Sector

DNA techniques help to detect legionella in the tropics

16 December 2019 — Conditions for the growth of legionella bacteria in water systems are different in the tropics than in the…

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News

Multiple sources of Genesee County Legionella Outbreak in 2014-2015

04 December 2019 — In 2017 the State of Michigan asked KWR to investigate the epidemic of Legionnaires’ Disease in Genesee County,…

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News

Working on water availability for industry

15 November 2019 — Many operational processes depend heavily on water. Companies need to have enough water, of the right quality and…

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Column

Water quality matters

14 January 2019 — Last Friday I delivered an invited talk on “Quality matters” during the Vakantiecursus day at TU Delft. The…

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News

Call on Indonesian attendees for cooperation

24 July 2018 — Jakarta recently played host to the seminar ‘Legionella risk, regulations & analysis’, which aimed to get its Indonesian…

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Blog

Airborne dispersal of Cyanobacteria

01 February 2018 — Scientists from Michigan State University have investigated whether harmful algae and associated compounds can be present in aerosols.…

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Column

2017, the year of Legionella pneumophila

17 January 2018 — Maybe you weren’t aware, but 2017 was the year of a variety of animals, plants and mushrooms. Bird-watchers…

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Water Sector

Next step in research on L. pneumophila growth conditions

19 January 2017 — KWR has taken an extra step in our understanding of the conditions that favour the growth of L.…

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