1. CNRS 
Key persons:
Géosciences Rennes – Coordinator of ENIGMA ITN :
Dr. Philippe Davy (CNRS research director, coordinator of ENIGMA)
Dr. Laurent Longuevergne (CNRS scientist)
Prof. Olivier Bour (Professor)
Dr. Tanguy Le Borgne (Professor)
Dr. Yves Méheust (associate Professor)
Dr. Alexis Dufresne (CNRS scientist at the Rennes ecology laboratory)
UPMC Paris – UMR 7619, METIS :
Dr. Ludovic Bodet (associate Professor in Paris)
Dr. Damien Jougnot (CNRS scientist in Paris, deputy coordinator of ENIGMA)
Members of the H+ Network :
University Montpellier 2 – UMR 5243:
Dr. Cédric Champollion (associate Professor)
Dr. Jean Chéry (Researcher)
Dr. Philippe Pézard (Researcher)
University Poitiers – UMR 7285, IC2MP:
Dr. Gilles Porel (associate Professor)
Dr. Jacques Bodin (associate Professor)
University of Avignon – UMR 1114 EMMAH (UAPV-INRA):
Dr. Konstantinos Chalikakis (associate Professor)
2. CSIC Barcelona
Key persons:
Prof. Jesus Carrera (Professor)
Prof. Carlos Ayora (Professor of Geochemistry)
Prof. Marco Dentz (Professor)
Dr. Maarten Saaltink (Professor, Doctor in Civil Engineering)
3. Forschungszentrum Jülich, Agrosphere Institute IBG-3
Key persons:
Prof. Jan Vanderborght (Professor)
Prof. Jan van der Kruk (Professor)
Prof. J.A (Sander) Huisman (Professor)
4. Helmholtz Centre for Environmental Research
Key persons:
Prof. Jan Fleckenstein (Professor)
Dr. Christian Schmidt
Dr. Ulrike Werban
5. University of Liège
Key persons:
Prof. Alain Dassargues (Professor)
Prof. Frederic Nguyen (Professor)
Dr. Thomas Hermans
Dr. Serge Brouyère
Dr. Nolwenn Lesparre
6. University of Tübingen
Key persons:
Prof. Olaf A. Cirpka(Professor)
Dr. Carsten Leven-Pfister
7. University of Copenhagen
Key persons:
Prof. Peter Engesgaard (Professor)
Prof. Karsten H. Jensen (Professor)
Prof. Majken C. Looms (Professor)
Prof. Lars Nielsen (Professor)
8. University of Lausanne
Key persons:
Prof. Niklas Linde (associate professor of environmental geophysics)
Prof Pietro de Anna (Professor)
9. Neuchâtel University
Key persons:
Prof. Philip Brunner (Professor)
Prof. Daniel Hunkeler (Professor)
Prof. Philippe Renard (Professor)
10. µQuans
Key persons:
Dr. Vincent Menoret (research engineer)
Bruno Desruelle (CEO of Muquans)
11. Itasca Consultants S.A.S.
Key persons:
Dr. Caroline Darcel
Dr. Romain Le Goc