The United Association of Journeymen and Apprentices of the Plumbing and Pipe Fitting Industry of the United States and Canada or "UA" as it is commonly known is a multi-craft union whose members are engaged in the fabrication, installation and servicing of piping systems. There are approximately 291, 000 highly-skilled United Association members who belong to 418 individual local unions across North America.

The American Society of Plumbing Engineers (ASPE) is the international organization for professionals skilled in the design, specification and inspection of plumbing systems. ASPE is dedicated to the advancement of the science of plumbing engineering, to the professional growth and advancement of its members and the health, welfare and safety of the public.

The American Society of Sanitary Engineering (ASSE) grew out of a meeting held in Washington, D.C., January 29-31, 1906. Henry B. Davis, Chief Plumbing Inspector for the District of Columbia, believed it was vital that plumbing practice in the United States be standardized. Since that time, the ASSE has developed a far reaching Standards Program for products that are components of the plumbing system. The standards, which have a heavy emphasis on backflow prevention devices, are used by national and local c

Water Metrics West: Premier Backflow and Water Meter Company in the Northwest ...