P. C. Ricketts was active in professional engineering and public affairs. He served as an assistant engineer for the Troy and Boston Railroad Company during the summers of 1876 and 1877. He was a consulting engineer for the Rome, Watertown and Ogdensburg Railroad from 1887 to 1891 and the chief engineer for the Troy Public Improvement Commission from 1891 to 1892. In the latter role, Ricketts advised the city in the design of sewage and water systems. From 1897 to 1898, he was a consulting engineer for flood control to the River Commission of Corning, N.Y. Ricketts was elected an honorary member of the American Society of Civil Engineers and the American Society of Mechanical Engineers. He was also active in local affairs. He was a bank director, a trustee for several academic organizations, and a director of the Troy Chamber of Commerce. He was honored as "the most outstanding citizen of Troy" in 1933.