Evaluate your situation Track down the impacted drain and extent of backup Verify if various drains are impacted (implies major line issue) Hunt for visible drinking water destruction or overflow Simple Do it yourself Actions Pour boiling drinking water down drain Use plunger suitable for sink/toilet Try out baking soda https://www.kawatan.net/why-you-should-never-use-baking-soda-and-vinegar-to-unclog-a-drain/