I see many similiar posts..we have a strong odor coming from the basement, gets worse when we run the dishwasher, I can roughly identify where the smell is coming up through the floor. Had the smoke test, no smoke came up through. Smoke test guy said it smells like a dead animal somewhere under / around the foundation. Had the critter control guy come out, he spent two hours, had a 'sniffing' dog, and said...nope, its a sewer problem. What scenario would lend itself to a break (hole) in the sewer (cast iron) pipe, but no smoke from the smoke test coming up through cracks in the foundation? Do I need to start digging up my basement floor in the area of the odor to find out? Any ideas welcome. Thanks.