I had a problem with an odor of sewage that I had several plumbers try to figure out. I called Ben Franklin Plumbing and they sent their team over with some high tech equipment, and cameras. It turned out to be a broken waste line under my concrete porch that was leaking into the foundation. This was one tough job but when it was done, the problem was fixed, odor gone, and you would never know they were there. They really did a professional job worthy of a 5 star recommendation no matter how tough the job is.