Trenchless Sewer Repair D.C. Trenchless sewer repair is sweeping the nation. Plumbers and contractors see trenchless sewer repair as another tool in their toolbox, and they couldn’t be more correct. Perma-Liner offers trenchless sewer repair training and certification, 24/7 technical support and marketing support. Perma-Liner has no territories, no franchise fees and no licensing fees! If you live in Washington D.C. and are interested in adding trenchless sewer repair as your next service, please contact us for the latest information.