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I already called a plumber to look into this but wonder what would cause my problem. I have a split level house with bathroom on 1st floor and one in the basement. I noticed the 1st floor toilet started draining slower than usual a few days ago. Then I noticed a sewage smell in the basement bath and evidence that the shower drain had sewage back up into it. When I flushed the basement toilet it barely drained, the bowl filled up then slowly drained. I figured the main drain must be partially blocked so I made an appointment for a plumber to come out next week. This is a 2nd home for me so I planned not to use any facilities until the plumber checks it. Today I noticed the sewer smell in the basement bathroom again and could see the sewage in the shower drain near the top, usually the water level is 6" down the drain where the trap must be. As I watched, the sewage rose up into the shower then I noticed the toilet leaking at the base, water level in the bowl was normal. I ended up using a garden hose to siphon the sewage from the shower drain to outside the house. So far it hasn't risen again. What would cause the sewage to back up like that when no facilities are being used? I even had the water supply shut off.