Why roots come back
Roots enter through joints, cracks, offsets, or defects. Cutting roots can restore flow, but it does not seal the entry point.
If the same line backs up repeatedly, ask whether lining, spot repair, or replacement would solve the opening.
Questions to ask
Ask how much root mass was found, where it was located, what pipe material you have, and whether the line was inspected after cleaning.
If chemical root treatment is offered, ask what it does, what it does not do, and whether it is allowed for your situation.
When to treat this as urgent
If sewage is coming up through a floor drain, shower, tub, or basement toilet, stop using water in the house and get help quickly. Do not run laundry, dishwashers, showers, or extra toilet flushes until the blockage is understood.
If only one sink or toilet is slow, the issue may be inside the home. If several fixtures are slow or the lowest drain backs up first, the main sewer line is more likely involved.
What to ask before approving work
Ask whether the contractor has camera evidence, where the defect is located, whether cleaning alone is enough, and whether repair or full replacement is being recommended.
For expensive work, ask for a written scope that explains access points, restoration, permits, expected timeline, warranty, and whether trenchless repair is possible.