Sewage backing up at more than one fixture, usually at the lowest drain in the house first.
A single slow drain is a fixture problem — hair, grease, a local clog in that branch line. A main line problem looks different: a basement floor drain gurgles or backs up, a laundry standpipe overflows, or a downstairs shower drains slowly while the upstairs bathroom works fine. That pattern means the blockage is downstream of where all those branch lines join, in the main lateral itself, and wastewater is finding the lowest opening it can reach rather than continuing on to the city main.
Getting a contractor out quickly matters here more than with most repairs, because a main line backup does not stay contained to one drain. Every fixture on the same branch is a candidate for the next backup, and in a basement that means the potential for water on the floor rather than just water in a pipe. The first move on arrival is almost always to clear the immediate blockage so the house is livable, and the camera work that identifies why it happened follows right behind that, not weeks later.
Tell us what the drains are doing and we will match you with a contractor who diagnoses before recommending a repair.
Get Matched With a Sewer ContractorTell us which fixtures are affected and how often — we will follow up to size the visit and get a camera on the line.