Bass Guy, if you suspect that the ground water table is very close to the drain field, and if your problem is that the sewage is backing up into the house, then installing an alternative treatment system is probably the least obtrusive, and less costly solution to your problem.
I recommend that you investigate a peat based filter system. Check out this website for a description of the technology.
http://www.rideau-info.com/local/septic-peatfilter.html
John Aldrich (Septic Tank Yank)
Septic System Consultant