Here are some industry links to some helpful sites that Ron George Design & Consulting Services is involved in.
ICC - International Code Council
IAPMO - International Association of Plumbing and Mechanical Officials
ASPE - American Society of Plumbing Engineers
ASSE - American Society of Sanitary Engineering
ABPA - American Backflow Prevention Association
AWWA - American Water Works Association
ASME - American Society of Mechanical Engineers
ASTM - American Society for Testing and Materials
CDA - Copper Development Association
CIPHE - CharteredInstitute of Plumbing and Heating Engineers
DWBP - Drinking Water and Backflow Prevention
NAPHCC - National Association of Plumbing, Heating and Cooling Contractors
NSF - The Public Health and Safety Company
PDI - Plumbing and Drainage Institute
PMI - Plumbing Manufacturers International
Thumbtack - Plumbing, Piping, Fire Protection & HVAC Designer
TREEO - Training, Research & Education for Environmental Occuapations Center
USEPA - US Environmental Protection Agency
VCCCA - Virginia Cross Connection Control Association
WPC - World Plumbing Council
Dry Drains Forum
Plumber Chicago
NFPA - National Fire Protection Association
IAAI - International Association of Arson Investigators
ASHRAE - American Society of Heating, Refrigerating and Air-Conditioning Engineers
MCAA - Mechanical Contractors Association of America
ANSI - American National Standards Institute
AGC - Associated General Contractors
TEI - Testing Engineer International
UA - United Association of Journeymen & Apprentices of the Plumbing and Pipe Fitting Industry of US & Canada