Could the leak be caused from something else? There is no water on bathroom floor, but could it be the toilet seal? Or a clogged vent backing up water or sewer? Help, we don't have much money and need answers fast.

I think we really need a better description of what is happening and how the room is constructed. Could you provide more info? If it were a toilet seal the dampness would be right at the toilet. A bad vent would cause bubbling or slow draining but not moisture on the floor unless the vent is cracked.

First off we have to find out what's leaking. Pump or city water? Do we have a pressure or a drainage leak? Regards, Tom