Repeated backups, multiple slow fixtures at once, sewer odor, a green stripe or sunken trench in the lawn, moisture at the foundation, unexplained pest activity, and age-plus-material are the seven signals. Any one justifies a camera inspection. Two or more, in a pre-1975 Metro Detroit home still on original clay or cast iron, usually points at replacement rather than another cleaning, and the inspection that proves it costs a few hundred dollars against a failure that picks its own timing.
The seven signs, and what each means underground
1. Backups that keep coming back
A drain that backs up once may be a clog, a toy, a grease slug, bad luck. A main line that backs up every few months after cabling is telling you the obstruction regrows, and the thing that regrows in Metro Detroit clay laterals is roots. The cable cuts them; the joints they entered through stay open; the schedule repeats. When cleaning becomes a subscription, the line is communicating clearly.
2. Multiple slow fixtures at once
One slow sink is that sink's problem. The basement floor drain gurgling while the first-floor toilet flushes lazy and the tub drains slow is a different animal: the branches are fine and the main is not. Lowest fixtures suffer first because they sit closest to the blockage's backwater. When the whole lower house slows together, stop treating fixtures and start thinking about the lateral.
3. Sewer odor, indoors or out
Sewer gas where it does not belong means the system is open somewhere it should not be. Indoors, rule out the cheap explanation first, a dry trap in an unused drain. Persistent odor in the basement, or along one strip of the yard, points at a breach: a cracked line, a failed joint, a belly holding waste that never fully clears.
4. A green stripe or a sinking trench across the lawn
A leaking lateral fertilizes the grass above it, producing a suspiciously lush stripe that maps the pipe. The same failure eventually washes soil into the line or voids the bedding, and the stripe becomes a shallow trench as the surface settles. Either version is your yard drawing you a diagram of the problem, complete with location.
5. Moisture or sewage at the foundation
Laterals typically exit through or under the foundation, and failures near that exit show up at the lowest level: damp floor near the cleanout, a wet corner that never quite dries, or in the bad version, sewage at the floor drain after heavy use. Water where the line exits is the sign that most reliably deserves same-week attention, because foundation-adjacent failures do not improve with patience.
6. Rats and unexplained pest pressure
A broken sewer is an open door into the yard and sometimes the house. Municipal rat complaints cluster where laterals are failing, and exterminators in older neighborhoods will tell you they are often treating a plumbing problem. Pest activity nobody can explain, paired with any other sign on this list, moves the camera inspection up the priority list.
7. Age plus material, the sign that is just arithmetic
Original clay or cast iron in a pre-1975 Metro Detroit home is past design life on the calendar alone. That does not mandate replacement today, plenty of old lines are limping along adequately, but it changes how you read every other sign. A 1962 ranch with recurring backups is a systemic-failure suspect until the camera proves otherwise; a 1996 colonial on PVC with one slow drain almost certainly is not.
Repair, or replace? How the call actually gets made
The camera inspection converts symptoms into a decision, and the decision logic is not complicated:
- Spot repair makes sense when damage is localized, one crushed section under the driveway, one bad joint, in a line that is otherwise sound on video.
- Replacement makes sense when the failure is systemic: roots at joint after joint, multiple offsets, a belly holding standing water, or pipe walls that are visibly done. Paying to chase one symptom at a time through a failing line is the most expensive way to buy a new sewer, you just buy it in installments, with cleanup costs between payments.
- Lining and bursting sit between the extremes for lines whose structure qualifies, protecting the surface while replacing function. Eligibility is a camera question, not a preference question.
The replacement conversation should always start with footage of your actual line. A contractor recommending replacement without video is selling; a contractor showing you roots at every joint is reporting.
What waiting actually costs
A deteriorating line fails on its own schedule, and its favorite moments are holidays, house guests, and the first hard thaw. The difference between planned and emergency replacement is real money in every direction:
There is also the quieter cost: a failing lateral undermines soil as it leaks, and the settlement, sidewalk slabs, porch corners, driveway edges, becomes its own repair list. The inspection is cheap leverage. It lets you choose the timing, the method, and the season instead of letting the line choose for you.
Monthly drain cabling on the same line is not maintenance, it is a subscription to a failing sewer. If cleaning has become routine, put a camera in the line, get the real diagnosis, and price the real fix. The cable company will forgive you.
Metro Detroit specifics worth knowing
The signs read the same everywhere; the base rates do not. Pre-war and early postwar neighborhoods, Detroit proper, Royal Oak, Warren, Dearborn, the inner ring, run almost entirely on original clay, so the same symptoms carry more weight there than in a 1990s subdivision plumbed with PVC. Mature street trees, the maples and oaks that make these neighborhoods worth living in, are also the root pressure that makes clay joints fail on schedule. And Michigan's freeze-thaw cycles keep soil moving, which is why offsets and bellies show up here more than in stable-soil markets. Know your home's decade and material, and you know how seriously to take the first symptom.
What to do this week if you recognized your house
- One sign, older home: schedule a camera inspection. Cheap, fast, definitive.
- Two or more signs: inspection this week, and start gathering the quote inputs, house age, known line material, what is on the surface above the run.
- Sewage at the floor drain or foundation moisture: call now. This is the same-week category, and emergency response exists for exactly this.
- Recurring backups with a cleaning already scheduled: have the camera run during the same visit. One trip, real answers.
The two-week self-diagnostic before you call anyone
You can sharpen the picture considerably with two weeks of ordinary attention, no tools required. Track which fixtures slow and whether they slow together, the pattern separates branch problems from main-line problems better than any single event. Note timing against weather: symptoms that spike after hard rain suggest groundwater finding a breach or a compromised line surcharging. Walk the lateral's likely path, house exit to street, weekly, and look for the stripe, the settling, the odor spot. Smell the basement near the cleanout on a dry day and after heavy use. And write down every backup with its date, because the interval between events is the single most useful fact you can hand the person running the camera. Two weeks of notes turns the inspection from exploration into confirmation, and it costs nothing.
What the camera report will actually tell you
A proper inspection ends with footage and findings you can hold: the line's material and diameter, depth at key points, the distance-stamped location of every defect, and the defect types by name, roots at joints, offsets, fractures, bellies with standing water, corrosion scale. It should answer three questions in plain language: is the damage local or systemic, is the line's grade intact, and which repair methods the structure will accept. That last one is where the money lives, a line that qualifies for bursting or lining prices differently than one that must be opened. If a report cannot answer those three, or arrives as a verbal summary with no footage, you paid for a look, not an inspection, and you should not sign a replacement contract on top of it.
Renters, landlords, and who owns this problem
The signs read the same in a rental, but the response path differs. Tenants: document the symptoms with dates and photos and report them in writing, because backups are habitability issues and the paper trail matters. Landlords and property managers: the arithmetic in this article compounds across a portfolio, a building whose lateral is failing generates emergency calls, unit damage, and tenant turnover on a schedule you can see coming from the first repeat backup. The camera inspection is even cheaper leverage at portfolio scale, and planned replacement between tenancies costs a fraction of emergency work under an occupied building. Several Metro Detroit management companies run exactly that play with us: camera the aging laterals proactively, rank them by findings, and replace on the calendar instead of the crisis.