Sewer Problem Symptom Checker — What's Wrong With My Sewer Line?
Sewer symptoms overlap — a backed-up basement drain can mean a $150 clog or a $15,000 broken lateral, and the right response ranges from pouring water in a floor drain to stopping all water use immediately. Answer a few questions to narrow down the likely cause and how fast you need to act.
How this works
This checker follows the same phone triage a good sewer pro runs: first separate main-line symptoms (multiple fixtures, or the lowest drain backing up when others run) from single-fixture plumbing clogs, then use timing (storms), history (recurring clogs plus mature trees), and yard evidence (wet, sunken, or lush patches) to narrow the cause. Those patterns come straight from how the failures work — a blocked main sends every fixture's wastewater to the lowest opening, roots regrow on a 2–3 month cycle, and a leaking lateral fertilizes and saturates the soil above it.
Urgency levels reflect real risk: an active sewage backup is a same-day emergency and a health hazard — stop water use, keep kids and pets away, and skip the chemical drain cleaners that can't reach a main-line clog. Recurring roots and leaking laterals are urgent-but-plannable: you have time to get a camera inspection and compare bids before a clog becomes a collapse. A smell with working drains is usually a dried trap you can fix for free tonight.
Cost ranges come from 2026 national pricing (Angi, HomeGuide): snaking a main line $100–$500, hydro jetting $350–$1,400, branch-line clearing $100–$250, root cutting $100–$600, sewer line repairs $1,500–$7,000, and full replacement $3,000–$20,000. This is a screening tool, not a diagnosis — a camera inspection by an independent local pro confirms what's actually in the pipe.
Estimates only — independent local providers quote their own pricing. Data last reviewed 2026-07.
Frequently Asked Questions
Why is sewage backing up in my basement floor drain?
The basement floor drain is the lowest opening in the house, so when the main sewer line blocks, that's where wastewater exits first — especially when a washer drains or a toilet flushes upstairs. Stop all water use and call a drain pro; snaking the main line runs $100–$500, hydro jetting $350–$1,400.
What are the signs of a broken sewer line?
Wet, sunken, or unusually green patches along the line's path, sewage odors outdoors, recurring clogs at multiple fixtures, gurgling drains, foundation cracks, and rodent or insect activity. Any two of these together justify a camera inspection ($125–$500) — repairs run $1,500–$7,000 and full replacement $3,000–$20,000, so confirming the diagnosis first matters.
Is sewage backup dangerous?
Yes. Raw sewage carries bacteria, viruses, and parasites. Keep children and pets away, ventilate the area, wear gloves and boots for any contact, and disinfect hard surfaces afterward. Porous materials like carpet that soaked up sewage usually need to be discarded.
Why do my drains only back up when it rains?
Either the city main is surcharging during storms and pushing sewage back up your lateral, or rainwater is infiltrating your lateral through cracks and overwhelming it. Report each event to the city (it matters for liability), and get a camera inspection to document which side of the line is at fault. A backwater valve can block city-side surcharges.
Will chemical drain cleaner fix a main line clog?
No. Retail drain cleaners can't reach or dissolve a main-line blockage — let alone tree roots — and they corrode older pipe while sitting in it. A main line needs mechanical clearing: a snake ($100–$500) or hydro jetting ($350–$1,400).
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Use the free tool →Prefer to just talk to someone?
Call or send the short form — we'll route you to an independent local pro.