The Sewer Administrator, duly authorized representatives or duly authorized employees of the Town or village, representatives of the EPA and representatives of the DEC bearing proper credentials and identification shall be permitted to enter properties for the purpose of inspection, observation, measurement, sampling and testing of the wastewater discharge to ensure that the discharge to the wastewater treatment system is in accordance with the provisions of this chapter. These representatives shall have no authority to inquire into any processes, including metallurgical, chemical, oil refining, ceramic, paper or other industries, beyond that point having a direct bearing on the kind and source of discharge to the wastewater treatment system.