Summary:
You finally got around to the backyard project. New fence, fresh irrigation system, maybe a tree or two along the property line. It looks great. Then, a few weeks later, the toilet starts gurgling. The drain in the basement runs slow. There’s a faint smell you can’t quite place.
It might be a coincidence. Or it might be that something underground got disturbed during the project — and it’s been quietly getting worse ever since.
This happens more often than most homeowners realize, especially on Long Island where sewer laterals are aging and buried closer to the surface than people expect. Here’s what you need to know before — and after — you dig.
Which Landscaping Projects Are Most Likely to Damage Your Sewer Line
Not every outdoor project carries the same risk, but several common ones come dangerously close to underground sewer laterals. Fence post installation is one of the most frequent culprits — posts are typically driven or augered 2 to 3 feet into the ground, and sewer lines in older Long Island neighborhoods can run as shallow as 18 to 24 inches below grade.
Irrigation systems are another common source of accidental damage. Trenching for irrigation lines often runs parallel to or crosses the sewer lateral, and the depth of that trench can vary depending on the contractor. Retaining walls, patio excavation, and even deep-root planting all carry real risk when the homeowner — or their landscaper — doesn’t know exactly where the pipe runs. If damage does occur, pipe lining may offer a less invasive solution for restoring the sewer line without extensive excavation.
Why Long Island Yards Are Especially High-Risk for Sewer Line Damage
Long Island’s housing stock tells the story. The post-war suburban expansion that built out communities like Bethpage, Bellmore, and Copiague in the 1950s and 1960s also laid hundreds of thousands of feet of clay tile and Orangeburg sewer laterals — materials that were never designed to last 70 years. Many of those original pipes are still in the ground today, running beneath yards full of mature oaks, silver maples, and decades-old landscaping.
That combination — old, brittle pipe plus aggressive root systems plus a generation of homeowners who have no idea where the lateral runs — is exactly why accidental damage happens so frequently here. A landscaper digging a trench for a drip irrigation system in a Merrick backyard isn’t thinking about a 60-year-old clay pipe two feet down. Neither is the homeowner who hired them.
There’s also a legal dimension most people don’t know about. In New York State, calling 811 — or contacting Dig Safely New York — is a legal requirement before any digging, regardless of what tool you’re using or how shallow you think you’re going. Shovels are involved in the second-highest number of underground utility strikes nationally, right behind backhoes. The assumption that hand-digging is automatically safe is one of the most common — and costly — mistakes homeowners make. You need to call at least two business days before you start, and the service is free.
Nationally, 89% of homeowner-caused underground line damage incidents happen without an 811 call. The average cost to repair a damaged utility line runs around $3,500 — and that’s just the utility repair, before you factor in any sewer lateral work that follows. A two-minute phone call before you dig prevents a lot of that.
Sewer Clogged After Digging? Here's What Might Actually Be Happening
One of the most disorienting things about accidental sewer line damage is the delay. You finish the project, everything looks fine, and then two or three weeks later the drains start acting up. By that point, most homeowners don’t connect the plumbing symptoms back to the landscaping work. They assume it’s a clog, have someone snake it, and move on — until it comes back again.
What’s actually happening in many of these cases is that the lateral was nicked, cracked, or partially collapsed during the project. Soil shifts into the gap. Root systems — which are constantly searching for moisture — find the opening and begin working their way in. The pipe doesn’t fail all at once. It degrades gradually, and the symptoms escalate over months.
A sewer clogged once is a nuisance. A sewer clogged repeatedly, despite snaking, is a signal that something structural is wrong. Slow drains across multiple fixtures — not just one sink or one toilet — is another strong indicator. So is a soft or unusually wet spot in the yard above where the lateral runs, or a persistent sewage smell near the foundation.
The tricky part is that none of these symptoms definitively confirm damage on their own. They could point to a root intrusion that started years before your landscaping project. They could indicate a bellied section of pipe that’s been collecting debris for a decade. The only way to know what’s actually going on is to put a camera in the line and look. There’s no guesswork involved — you either see damage or you don’t.
What a Plumbing Camera Inspection Actually Shows You
A plumbing camera inspection — also called a sewer scope — involves feeding a high-resolution camera through the sewer lateral from a cleanout access point, usually near the foundation or in the basement. As the camera travels through the pipe, it transmits real-time video of the interior, showing exactly what’s there: root intrusion, cracks, offset joints, collapsed sections, debris buildup, or a pipe that’s in perfectly good shape.
The inspection typically takes 30 to 60 minutes. What you get at the end isn’t a vague verbal assessment — it’s actual footage of your pipe, with a clear picture of what needs to happen next.
How We Conduct Sewer Scope Inspections on Long Island
When we perform a sewer scope inspection, you’re watching the camera feed alongside our technician in real time. We’re not going to hand you a written summary and tell you to trust us — you see exactly what we see, as we see it. That transparency matters, especially when a contractor is about to recommend repair work that could cost several thousand dollars.
We’ve been doing this on Long Island since 1980. That’s not a marketing line — it means our technicians have seen the full range of what’s buried under Nassau and Suffolk County yards: original clay tile from the Levittown era, Orangeburg pipe that’s deformed into an oval, cast iron laterals with decades of root intrusion, and PVC lines installed 20 years ago that were nicked during a fence installation and have been slowly failing ever since.
Knowing what type of pipe you’re dealing with — and how it typically fails — changes how you read the camera footage. A hairline crack in a clay lateral behaves differently than a root intrusion in a cast iron joint. The repair approach is different too. A camera inspection without that local knowledge behind it is just video. With it, it becomes a diagnostic tool that tells you what’s wrong, why, and what the right fix actually is.
The cost of a residential sewer camera inspection typically runs between $125 and $500. The average cost of repairing undetected sewer line damage is $7,500. Those two numbers tell you everything you need to know about whether a scope is worth it after a landscaping project.
No Dig Sewer Repair: How We Fix the Line Without Destroying Your Yard
This is the part most homeowners don’t know about — and it’s the part that usually changes the conversation.
If the camera inspection finds damage, the instinctive fear is that fixing it means tearing up the yard you just spent money on. That’s understandable. It’s also, in most cases, not what happens. We offer trenchless sewer repair through pipe lining and pipe bursting — methods that repair or replace the lateral with minimal excavation, often through just one or two small access points.
Pipe lining, also called CIPP (cured-in-place pipe lining), involves pulling a resin-saturated liner through the existing pipe and curing it in place. The result is a new, seamless pipe inside the old one — smooth, root-resistant, and rated for 50 years. We back our pipe lining work with a 50-year warranty. Pipe bursting is used when the existing pipe is too deteriorated to line — a new pipe is pulled through while simultaneously fracturing the old one outward. Either way, your landscaping stays largely intact.
We’re one of the only contractors offering the full suite of trenchless options across both Nassau and Suffolk County. That matters because not every repair situation calls for the same solution — and having all the tools available means we can match the method to the problem, not the other way around.
For Long Island homeowners who’ve been putting off sewer work specifically because they didn’t want to lose their yard, this is the answer. The Bethpage homeowner who postponed work for years because of the disruption concern, the Bellmore homeowner who assumed excavation was the only option — trenchless repair is what changes the math on those decisions. You don’t have to choose between fixing the pipe and keeping the property intact. With the right contractor and the right technology, you can do both.
We’re also available 24/7, including holidays. If a landscaping project uncovers a problem mid-weekend or a backup starts on a Sunday morning, we’re reachable. That’s something our customers have confirmed in their reviews, citing responses on New Year’s Day and within 30 minutes on a Sunday.
When to Call for a Sewer Scope After a Landscaping Project on Long Island
If you’ve recently completed any outdoor project that involved digging — irrigation, fence posts, tree planting, grading, a patio — and you’re now noticing slow drains, gurgling sounds, or anything that feels off with your plumbing, don’t wait. The longer a damaged lateral goes uninspected, the more the problem compounds. Root systems don’t stop growing. Soil doesn’t stop shifting.
A camera inspection is a low-cost, low-disruption way to get a definitive answer. Either the pipe is fine and you move on, or you find out exactly what needs to happen before a manageable repair becomes a major one.
Long Island Water and Sewer Main – Allied All City has been doing this work across Nassau and Suffolk County for over 40 years. If you want to know what’s actually going on under your yard, we can show you — in real time, without guesswork, and without tearing up what you just built.
Need this done on Long Island? Long Island Sewer and Water Main handles sewer services across Nassau and Suffolk County. Call 631-407-2873 in Suffolk or 516-604-2651 in Nassau.