Pittsburgh has some of the oldest sewer systems in the country. If your home was built before 1980, there is a good chance your sewer line is clay or cast iron — materials that deteriorate over decades. Here are the warning signs that something is going wrong underground.
Sign 1: Multiple Drains Backing Up
If one drain is slow, that is usually a local clog. If multiple drains are slow or backing up at the same time — toilets, showers, basement floor drain — the problem is in the main sewer line that connects your house to the municipal system.
This is the clearest sign of a sewer line issue. Do not ignore it.
Sign 2: Sewage Smell
If you smell sewage in your yard, basement, or near your foundation, there is likely a crack or break in the sewer line allowing gases to escape. Sewer gas contains methane and hydrogen sulfide — it is not just unpleasant, it is a health concern.
Sign 3: Wet or Sunken Spots in the Yard
A broken sewer line leaks wastewater into the surrounding soil. This can create:
- Unusually green or lush patches of grass (the sewage acts as fertilizer)
- Soggy areas that never dry out
- Sunken spots where soil has washed away around the break
- Sinkholes in severe cases
Sign 4: Gurgling Sounds
If your toilet gurgles when you run the bathroom sink, or your basement drain gurgles when you flush upstairs, air is being displaced in the sewer line. This usually means a partial blockage or damage that is restricting flow.
Sign 5: Recurring Clogs
If the same drain keeps clogging no matter how many times you clear it, or if you need a plumber to snake your main line more than once a year, the pipe itself is the problem — not just a temporary blockage.
Common causes in Pittsburgh:
- Tree roots growing into pipe joints (huge problem with mature trees)
- Pipe deterioration — old clay pipes crack, cast iron corrodes
- Bellied pipe — sections of pipe that have sagged due to ground movement, creating a low spot where waste collects
- Joint separation — ground shifting on Pittsburgh's hills can pull pipe joints apart
What to Do Next
If you notice any of these signs, the first step is a camera inspection. A plumber feeds a camera through the line to see exactly what is going on. This costs $100-$350 and gives you a clear picture before spending money on repair.
Prevention
- Root killer for sewer lines — annual treatment to prevent root intrusion
- Enzyme drain maintenance — keeps lines flowing between professional cleanings
- Backwater valve — prevents municipal sewer backups into your basement
Getting Help
If yinz are seeing any of these signs in your Pittsburgh home, get connected through NebbyPlumber. A camera inspection is the smart first step — and we will find a local plumber who can do it.