+ American Backflow Prevention Association
+ American Society of Plumbing Engineers - Houston Chapter
+ American Society of Plumbing Engineers - (ASPE) international organization
+ American Society of Sanitary Engineering - association sanitary engineering principles
+ American Supply Association (ASA) - association plumbing, heating, cooling products wholesalers and manufacturers
+ American Water Works Association (AWWA)
+ Association of Industry Manufacturers Representatives (AIM/R)
+ BOCA International - assists code officials
+ Copper Development Association (CDA)
+ Florida Association of PHCC
+ Fresno Area Plumbers, Pipe and Refrigeration Fitters - apprenticeship program, California
+ International Association of Plumbing and Mechanical Officials (IAPMO)
+ International Conference of Building Officials (IBCO)
+ Master Plumbers' School - Staten Island, New York - Emanuel A. Troise Jr.
+ Minnesota Pipe Trades - union site
+ Nassau County Association of Plumbing, Heating & Cooling Contractors - Long Island (Nassau & Suffolk), New York PHCC
+ National Kitchen & Bath Association
+ New Jersey State League of Master Plumbers - The Nations Oldest League of Master Plumbers
+ NSF International (NSF)
+ Omni - Plumbing suppliers buying group
+ PEX Supply - PEX Supplier
+ PHCC Maryland State Web Site - Maryland State office of the PHCC National Association
+ PHCC of Greater Los Angeles Local Association - PHCC Association
+ PHCC/Master Plumbers Association of Wisconsin - Wisconsin
+ Pipe Trades Association - United Association of Journeymen and Apprentices - UA locals in Calif. Bay area
+ Piping Industry Progress & Education (P.I.P.E.)
+ PlumbingForum.com
+ Plumbing Foundation City of New York - The Plumbing Foundation City of New York
+ Plumbing-Heating-Cooling Contractors Association of California - California
+ Plumbing, Heating, Cooling Contractors Association of Washington State
+ Plumbing Manufacturers Institute (PMI)
+ Seattle Pipe Trades - union site
+ South Bay Piping Industry - union site
+ Suffolk County Association Of Master Plumbers - Suffolk County, Long Island, New York.
+ UPA - Plumbing Buying Group
+ United Association of Journeymen and Apprentices - union plumbers, pipe fitters, technicians, apprentices
+ Water Quality Assoc.
+ Wisconsin Pipe Trades Association - union site