National Association of Plumbing Heating Cooling Contractors, Falls Church, VA
“The National Standard Plumbing Code”
The National Standard Plumbing Code is used in Maryland, New Jersey, and some cities. The latest printing is 2015 with 2015 supplements.
International Association of Plumbing and Mechanical Officials, Walnut, CA
“Uniform Plumbing Code”
The Uniform Plumbing Code is used in Western United States. The latest printing is 2015.
International Code Council, Whittier, CA
“International Plumbing Code”
The IPC is a new plumbing code developed by the BOCA, ICBO, and SBCCI membership. The latest printing is 2015.