Chiang Patel & Yerby, also known as CP&Y, offers a range of engineering services. The company has been in operation since 1980 and has more than 100 water and wastewater treatment projects in the southwestern United States. It offers infrastructure design for pipelines and storage tanks, as well as pump stations. The company undertakers projects for highways, bridges and transit systems. Chiang Patel & Yerby s clients include the City of Irving and the City of Dallas. It also provides planning, design and construction management services for airports. The company offers supervisory control and data acquisition services. Chiang Patel & Yerby conducts environmental assessments and studies.