If water is backing up slowly or rapidly in your basement or drain and you have not, or are not using water, it is best to call the Wastewater Department first. We can then check the sewer main line for a blockage and if none is found you can then call your plumber. If you are using water and a drain is backing up, shut off the water and see if the water stops coming up. If it stops, you should probably call your plumber to see what the problem is. You can also check out this informative pamphlet (PDF).