By the time a sewer line break causes visible damage, it's usually been developing for a while. The signs tend to show up gradually and in places that don't immediately point to the sewer line, which is part of why breaks often go unnoticed longer than they should.
A patch of yard that's unusually soggy or greener than the grass around it is one of the more common early indicators. It means wastewater is finding its way into the soil instead of staying in the pipe. Odors are another, whether that's a sewer smell drifting through the yard or showing up indoors, which happens as gases escape from the break.
Inside the house, the signs are quieter: drains that have all gotten a little slower over time, or gurgling from a toilet or tub when another fixture is used elsewhere in the house. Neither looks alarming on its own, which is exactly why they're easy to write off as normal wear rather than a sign of something happening underground.
None of these signs guarantee a break on their own, but seeing more than one together is a strong enough pattern to justify a camera inspection. Catching it at this stage is a lot less disruptive than waiting for the yard to visibly cave in or the damage to spread indoors.
