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Contact WPI 9400 Plum Drive Suite 160Urbandale IA 50322Phone 1 515 2323623Send an email MENU Contact WPI 9400 Plum Drive Suite 160Urbandale IA 50322Phone 1 515 2323623Send an email MENU We Are WPI We ensure the expertise of water and wastewater treatment professionals through testing and certification. Water and wastewater treatment professionals are on the front lines of protecting public health and the environment. Since 1972 Water Professionals International formerly known as the Association of Boards of Certification has been the central water industry authority that ensures these women and men are prepared to meet the standards that their communities can trust in through our testing and certification services. WPI membership spans 49 U.