American Association for Advancement of Science

Association for the Advancement of Medical Instrumentation

American Chemical Society

American Council on Science and Health

American Desalting Association

American Filtration & Separations Society

American Institute of Chemical Engineers

American Institute of Chemists

American Membrane Technology Association

American National Standards Institute

American Public Health Institute

American Pharmacist Association

Association of Public Health Laboratories

American Petroleum Institute

American Supply Association

Association of State Drinking Water Administrators

American Society of Mechanical Engineers

Association of State & Territory Health Officials

American Society for Testing and Materials

Association of Water Technologies

American Water Works Association

College of American Pathologies

Canadian Ground Water Association

Center for Infectious Disease Research & Policy

Canadian Institute of Plumbing & Heating

Clinical and Laboratory Standards Institute

Canadian Water Quality Association

Canadian Water Resources Association

Canadian Water & Waste water Association

Electric Power and Research Institute

Ground Water Protection Council

International Association of Plumbing & Mechanical Officials

International Bottled Water Association

International Confederation of Contamination Control Societies

International Ozone Association

Institute for Safety & Health Management

International Ultraviolet Association

Millennium Water Alliance

National Association of County & City Health Officials

National Association of Local Boards of Health

National Academy of Sciences

National Association of Water Companies

National Environmental Health Association

National Ground Water Association

National Rural Water Association

Plumbing-Heating-Cooling Contractors Association

Ontario Ground Water Association

Public Health Foundation

Public Health Institute

Plumbing Manufacturers Institute

United States Pharmacopeia

Valve Manufacturers Association of America

Water Environment Federation

Water Environment Research Foundation

Water For People

World Health Organization

World Plumbing Council

Water Quality Association