Whenever you have water backing into your sink, tub, shower or toilet, its a sure sign that you have a clog somewhere in the line. If water is simply backing into that one thing, then its most likely a clog in the secondary lines.
If water is backing up into a sink, toilet, tub or shower when water is used anywhere in the house, then most likely your main sewer line is where the clog is at. Affordable Quality Plumbing has the proper equipment and professionals to find where your main sewer line is clogged and/or leaking and get it fixed right.