2000-2003  Term: Member of the National Research Council Committee on USGS Water Resources Research. Water Science and Technology Board, The National Academies, Washington D.C.

2000- IWRA Millennium Awards Committee, Member.  Presidential Committee for selecting the Occasional International Award of IWRA for individuals, institutions and programs

2000 – 2003, Organizing Committee for the XIth World Water Congress of IWRA to be held on October 8-12, 2003 in Madrid, Spain

2003 – 2005, Member of Organizing Committee for the XII^th World Water Congress of IWRA to be held on November 22-25, 2005 in New Delhi, India

2003 – 2005, Member of International Scientific Steering Committee for the XII^th World Water Congress of IWRA to be held on November 22-25, 2005 in New Delhi, India

2000- Member of Scientific Committee: IVth International Conference on Water Supply and Water Quality, held on September 11-13, 2000, in Krakow, Poland

1998-2000 Term:  Chair, Water International Best Paper Award Subcommittee, International Water Resources Association, Carbondale, Illinois

1998-1999- Symposium Organizing Committee.  The Role of Water Desalination in Averting Global Water Crisis.  Paul Simon’s SIU Public Policy Institute and IWRA.

1998-2000- Organizing Committee for the Xth World Water Congress of IWRA held on March 12-15, 2000 in Melbourne, Australia

2007 – 2009 – Elected Member (Treasurer) of Executive Board of International Water Resources Association.

2004-2006  - Vice Chairman of Advisory Committee, International Conference on Hydrological Sciences for Managing Water Resources in the Asian Developing World, to be held on June 8-10, 2006, in Guangzhou, China.

2005. Honorary Lifetime Member. Polish Society of Sanitary Engineers and Technicians. PZITS of Polish Technical Organization. Wroclaw Poland, July 1, 2005

1998 Chair, Balloting Committee, Illinois Section, American Water Resources Association.

1993-1994 - Member of Water Planning and Evaluation Standards Subcommittee, American Water Works Association.

1988- Honorary (Lifetime) Member, Water Conservation Committee, American Water Works Association.