Sewage problems are disgusting, stinky and expensive plumbing works. Before signing on the dotted line, find out what kind of sewage system the house has. If there’s a septic tank, find out where it is located, where its line runs, how big it is, and the time when it was last emptied or serviced. Check the area of the tank, as well as its line, paying attention for bad odours, stagnant water and other signs of seepage. Since problems with septic tanks are usually costly, this is something you must insist on getting a deeper discount or having fixed before finalizing the deal.