Quick answer: If multiple drains back up at once, you hear gurgling, or you notice sewage odors, you may have a clogged main sewer line. The safest move is to stop using water and call a professional for drain cleaning and (if needed) video inspection.
1) Multiple drains backing up
If the lowest drain in the house (often a basement drain or first-floor shower) backs up when you use another fixture, that can point to a main line restriction.
2) Slow drains throughout the house
One slow sink may be a local clog. Several slow drains at once often indicates a bigger issue in the main line.
3) Gurgling toilets or drains
Gurgling can happen when trapped air is forced through water in traps — a common symptom of a partial blockage.
4) Sewage odors
Persistent sewage smells inside or outside can signal a sewer problem that needs professional attention.
5) Wet spots or sewage in the yard
Unexpected wet areas, strong odors, or visible sewage can indicate a serious problem. Avoid contact and call for service right away.
What you should do next
- Stop using water. Avoid running sinks, showers, dishwashers, or laundry to reduce the chance of overflow.
- Check the basics safely. If you have an accessible cleanout and know how to use it safely, you can inspect for standing water — but don’t force anything.
- Avoid harsh chemical drain cleaners. They can be unsafe and may not solve main line clogs.
- Call for professional cleaning and video inspection. A camera inspection can locate the cause so the fix is targeted.
Need sewer line help in Western PA?
A-Affordable Sanitation Inc provides sewer and drain cleaning (with video inspection), trenchless sewer repair, and line locating across Greater Pittsburgh, PA & Western Pennsylvania. Call (724) 872-0822 or request service online. Start here: Sewer & drain services hub.