? I could have but since the sewer line is above the finished floor of the basement it would have been a bit difficult to make it flow up hill and since the basement is below the sewer line it was necessary to install a pump to pump it up so it can flow down to the sewer. Another good reason to rough in a bathroom in the basement since I needed one of those "well" things (actually it looks like a huge bucket that everything flows into) and route the toilet, shower and sink drain to it. When you finish the bathroom you add a submersible pump that pumps everything up to the main drain line so it can flow down to the sewer.