A plumbing inspector examines and tests various plumbing and drainage systems to ensure the piping has been installed correctly and that the system complies with local, state, and federal codes. This service is typically required for commercial and public-use buildings. As a plumbing inspector, your responsibilities include reviewing construction plans, teaching building owners how to fix code violations, and reporting any unresolved issues. Your inspection is both visual and mechanical; you must confirm the project utilizes the proper piping size, connections, trap seals, and cleanouts, and that the contractors only use approved materials, devices, fixtures, and equipment.