Can plumbing be added to a basement if rough-in is not added during initial construction and the water table sits only 1 foot below the slab?

Look for a special toilet that mounts directly to the floor and the water drains into a box mounted on the floor behind the toilet, under the tank. This box contains a pump that runs off electricity (plugs into standard outlet), and when the toilet is flushed, the waste goes into the box and is pumped up and out, joining at some later point with existing sewer drain lines. Thi was recently shown on an episode of "Ask The Old House." There may be more info on their website.

It's called a "macerating toilet" and many times has inlets to ease the installation of a sink and/or shower as well.