Your sewer lateral is the pipe that runs from your house to the city's sewer main — usually out under your yard or driveway. It's the most critical pipe you own and the one you think about least. It's also almost always the source of a "sewer problem" when one pops up.
After 25+ years of inspecting sewer laterals across Alameda and Contra Costa counties, the same handful of issues show up again and again. Here are the big ones.
1. Root intrusion
What it is: Tree roots find their way into your sewer line through joints or cracks and grow inside the pipe.
How you'll notice: Slow drains. Gurgling toilets. Recurring clogs that "come back" a few months after being snaked.
What causes it: Mature trees within 15-20 feet of the line. Old clay or cast iron pipes with joints every few feet.
What to do: Camera inspection to confirm, then annual root cuts or hydrojetting to keep them in check. If roots have cracked the pipe itself, that section may need trenchless replacement.
2. Grease buildup
What it is: Cooking grease poured (or rinsed) down the kitchen drain cools, hardens, and accumulates on the inside of the pipe — narrowing the line over time.
How you'll notice: Slow kitchen drains. Eventually, full blockages that back up into other fixtures.
What causes it: Years of kitchen drain habits in older homes. Particularly common in homes that have done a lot of cooking over decades.
What to do: Hydrojetting. A snake won't touch it — hardened grease needs to be dissolved and scoured off the pipe walls.
3. Cracked, broken, or offset pipe
What it is: The pipe itself has lost its structural integrity — a crack has formed, a section has broken, or joints have shifted out of alignment.
How you'll notice: Often you won't — not until a backup happens or a camera reveals it. Sometimes you'll see sinkholes or damp spots in the yard above the pipe.
What causes it: Age. Ground movement. Roots widening cracks. Seismic activity. Heavy vehicles over buried lines.
What to do: Spot repair if it's limited to one section. Trenchless replacement if the damage is more extensive.
4. Belly in the line
What it is: A section of pipe has sagged down, creating a low spot where water and waste pool instead of flowing through.
How you'll notice: Recurring clogs at roughly the same distance from the cleanout. Sludge buildup seen on camera.
What causes it: Ground settlement. Poor original installation. Soft or unstable soil.
What to do: Hydrojetting clears the current buildup but doesn't fix the belly. Permanent fix requires excavation to re-grade the pipe. If the belly is minor and manageable, annual hydrojetting maintenance can keep it functional.
5. Collapsed pipe
What it is: A section of the pipe has completely failed — walls caved in, debris blocking flow.
How you'll notice: Full sewer backup. This is usually the "emergency" you see in plumbing nightmare stories.
What causes it: Age. Older cast iron that's corroded through. Roots that have grown so large they've crushed the pipe. Ground movement over time.
What to do: Replacement — either targeted to the collapsed section or the full line, depending on the condition of the rest of the pipe.
6. Cleanout missing or buried
What it is: The cleanout is an access point where a plumber can enter your sewer line to inspect or service it. Many older homes either never had one or have had it paved/landscaped over.
How you'll notice: Every service call is harder and more expensive because the plumber has to find or create access.
What to do: Install a cleanout. It's a straightforward project that saves you money on every future service.
7. Illegal taps or cross-connections
What it is: Rare, but occasionally we find a yard drain, sump pump, or gutter downspout that someone connected to the sewer line (usually decades ago, usually not legal).
How you'll notice: Sewer backups during heavy rain.
What to do: Redirect the offending connection to a proper storm drain. Sometimes a requirement for compliance inspections at point of sale.
The fix for all of the above: look before you guess
Most of these issues have similar symptoms — slow drains, backups, odors. The only way to know which one you're actually dealing with is to put a camera in the line. A 30-minute inspection tells you exactly what's going on and what it'll take to fix.
Don't let anyone quote you a major repair without showing you video first.
Ready to know what's down there?
Schedule an inspection and we'll tell you exactly what's going on. Full written report, video, and straight talk about your options.
Call (925) 371-7500 with questions.