I have been in my new home for roughly 9 months, and everytime it rains heavily, there is a foul smell coming from my master bathroom (apparently the toilet). This is a new home with two baths, and the strange thing is that the other bathroom does not have the smell, and it is much closer to the main drain to the septic tank. Since the odor is only really bad, during/after a rainstorm, this would lead me to believe that the field lines are not properly draining. But since there is no odor in the bathroom right at the septic tank, this makes it seem like the field lines may not be the problem. I really need to find out what is wrong, before the warranty on my home expires (1 year), so I can require the builder to fix the problem if it is an improperly installed system. Any help would be appreciated.