| Water-Rock Interaction | Working Group Leader - Halldór Ármannsson, Iceland Geological Survey |
| Global Geochemical Baselines | Working Group Leader - David B. Smith, U.S. Geological Survey |
| Applied Isotope Geochemistry | Working Group Leaders - Martine Savard, NRC/GSC, Canada; Thomas D. Bullen, U.S. Geological Survey |
| Geochemistry of the Earth's Surface | Working Group Leader - Sigurdur Reynir Gislason, University of Iceland |
| Urban Geochemistry | Working Group Leader - Rolf Tore Ottesen, Geological Survey of Norway |
| Biogeochemistry | Working Group Leader - Martin Novak, Czech Geological Survey |