Assess your situation Track down the affected drain and extent of backup Check if various drains are impacted (implies principal line issue) Hunt for seen water problems or overflow Simple Do it yourself Methods Pour boiling h2o down drain Use plunger appropriate for sink/bathroom Attempt baking soda + vinegar Resolution https://www.kawatan.net/how-to-find-emergency-drain-cleaning-and-plumber-services-in-etobicoke/