Pipe Rehabilitation Washington D.C. If you’re looking for pipe rehabilitation in the Washington D.C. area, you’ve come to the right place! Perma-Liner is the leader in pipe rehabilitation for residential, commercial or municipal applications in North America. Washington D.C. is no place to risk a costly dig up of underground pipes. If you live or work in the Washington D.C. area and are interested in seeing a live demonstration or would like to learn more about the pipe rehabilitation or Perma-Liner, please contact us right away!