ASSE Sustaining Members and IAPMO Organizational Members are recognized as product manufacturers, national or international institutes, societies, trade or professional associations, and associations or organizations affiliated with the plumbing, mechanical, water treatment and construction fields desiring to recognize, advance, and support the Associations and its purposes. An ASSE Sustaining Member and IAPMO Organizational Member shall have one (1) vote in the affairs of both the Associations and shall pay dues as determined in accordance with the Bylaws of both ASSE and IAPMO. The member shall designate in writing one (1) person to exercise its one (1) vote in both associations in a manner prescribed by the Boards of Directors.

The following is a list of ASSE Sustaining Members and a link to their websites. Companies without a web address are listed with a mailing address.