This U.S. industry comprises establishments primarily engaged in (1) pumping (i.e., cleaning) septic tanks and cesspools and/or (2) renting and/or servicing portable toilets. Cross-References. Establishments primarily engaged in-- ? Installing septic tanks--are classified in Industry 238910, Site Preparation Contractors; and ? Cleaning and rodding sewers and catch basins--are classified in U.S. Industry 562998, All Other Miscellaneous Waste Management Services.