Learning Center
The sewer questions Seattle actually asks — answered straight
35 plain-language answers, organised by what you're seeing at home rather than by what we sell. Separate from our blog.
Symptoms & diagnosis
What is my drain trying to tell me?
Gurgles, smells, slow drains, water where it shouldn't be — what each one usually means underground.
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My sewer is backing up right now — what do I do first?
Stop using water in the house — every flush and shower adds to what is coming up. Keep people and pets out of the wet area. Check whether the…
3 min -
What does an “offset joint” on my sewer inspection mean?
An offset joint means two sections of pipe have shifted so their ends no longer meet cleanly, leaving a ledge inside the pipe. Small offsets catch…
3 min -
What is a sewer belly, and does it have to be dug up?
A sewer belly, or sag, is a section of pipe that has settled below the pipe on either side, so water and solids sit in it instead of flowing…
2 min -
Why are all my drains slow at the same time?
When every fixture in the house drains slowly at once, the restriction is downstream of all of them: the building drain or the side sewer to the…
2 min -
Why does my sewer back up only when it rains hard?
A sewer that only backs up in heavy rain is taking on water it was never meant to carry. In Seattle that is one of three things: groundwater…
3 min -
Why does my toilet gurgle when the shower or washer runs?
A gurgling toilet means air is moving where water should be. When the shower or washing machine drains, water pushes air ahead of it; if the main…
3 min -
Why does my yard smell like sewage after it rains?
A sewage smell outdoors after rain usually means one of three things: a cracked or separated side sewer that leaks effluent into the soil, which…
3 min -
Why is water coming up through my basement floor drain?
A floor drain is the lowest opening in your plumbing, so it is the first place a backed-up main line shows itself. If the water is grey or smells…
3 min
Pipe materials & older houses
What is actually under my Seattle house?
Clay, concrete, Orangeburg, cast iron: how to tell what you have, how it fails, and what that means for the fix.
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Do I have Orangeburg sewer pipe, and how long does it last?
Orangeburg is a bituminised wood-fibre pipe used for side sewers from roughly 1945 to 1972, when clay and iron were short. It softens with age,…
3 min -
How deep is my sewer line, and how do you find exactly where it runs?
In Seattle a side sewer is typically four to eight feet deep near the house and deeper toward the street — sometimes twelve feet or more on sloped…
3 min -
How long does a clay sewer pipe last, and how does it fail?
Vitrified clay pipe itself can last well over a century — it does not rust or rot. What fails is the joints: the mortar or tar packing between…
3 min -
Is my problem under the basement slab or in the side sewer?
Most pre-1975 Seattle houses have two different sewer pipes: cast iron under the basement slab and clay, concrete or Orangeburg from the…
3 min -
What sewer pipe does my Seattle house probably have, by the year it was built?
Before 1945, expect vitrified clay or concrete with mortar joints. From 1945 to the early 1970s, expect clay, concrete or Orangeburg fibre pipe,…
3 min -
Why is my concrete sewer pipe cracking from the top down?
Concrete pipe corrodes from the crown down. Hydrogen sulphide from sewage collects in the air space at the top of the pipe, bacteria convert it to…
3 min
Trenchless & repair methods
How is a sewer actually fixed?
Lining, pipe bursting, spot repair, hydrojetting — what each does, when it fits, and what your yard looks like after.
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Can a collapsed sewer line be lined, or does it have to be dug up?
A truly collapsed section — where the pipe wall has fallen in and the camera cannot pass — cannot be lined; the liner needs a continuous host to…
3 min -
Do I need the whole sewer line replaced, or just one section?
Replace or repair the section that is actually failed, and seal or leave the rest based on its condition. One collapsed joint or one belly in an…
3 min -
How long does a trenchless sewer job take, and what happens to my house that day?
Most residential lining jobs are done in one day and most bursting jobs in one to two, after a separate inspection and permit lead time of a few…
2 min -
Hydrojetting or snaking: which one does my sewer line actually need?
A cable snake bores a channel through a blockage — good for restoring flow fast and for a single root mass or object. A hydrojetter uses…
2 min -
Lining or pipe bursting: which trenchless method fits my sewer?
Lining creates a new resin pipe inside the old one, so it needs a host that is round and continuous — good for clay and concrete with joint…
3 min -
What “trenchless” sewer repair does and does not mean
Trenchless means the pipe is repaired or replaced without digging a trench along its full length. It usually still involves some excavation: pits…
2 min -
What is UV-cured (Bluelight) lining, and how is it different from steam-cured?
UV-cured lining uses a fibreglass liner with a light-activated resin. After the liner is inflated in the pipe, an LED light head is pulled through…
2 min
Inspections, buying & selling
What does a camera inspection tell me?
What happens during a scope, how to read the report, and when a sewer inspection belongs in a real-estate deal.
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How do I read a sewer scope report?
A scope report describes the pipe by material and section, then lists defects with a distance from the entry point and a severity. Structural…
3 min -
How do sewer lines work in a Seattle townhome, and what should I inspect?
Most Seattle townhomes built since the late 1990s share a private side sewer with the other units in the row, joined by a common line to the city…
2 min -
Should I scope my sewer before listing my Seattle house?
Yes, if the house was built before about 1980 or the line has ever backed up. Seattle buyers almost always scope the sewer, and a defect found…
2 min -
What actually happens when your sewer gets scoped?
A technician feeds a self-levelling camera on a push cable into the sewer from a cleanout, a pulled toilet or a roof vent, watching a monitor as…
3 min -
What sewer records should a property manager keep for each building?
For every building, keep a dated baseline camera video with a trace and depth sketch, the side sewer permit and any repair records, the…
2 min
Permits, ownership & Seattle rules
What am I responsible for?
Side sewer permits, shared laterals, combined sewers, insurance — the rules that decide who does what and who pays.
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Do I need a Seattle side sewer permit, and how does the process work?
Yes. Repairing, replacing, lining or bursting a side sewer in Seattle requires a side sewer permit — issued by Seattle Public Utilities since…
2 min -
Does homeowners insurance cover a sewer line repair or a backup?
Usually not. A standard homeowners policy treats the sewer line as a maintenance item and excludes damage from wear, roots, and settlement — which…
2 min -
Is my Seattle house on a combined sewer, and why does it matter?
Roughly a third of Seattle — the older core around downtown, Capitol Hill, Queen Anne, Ballard, Fremont, Wallingford, Beacon Hill and the…
2 min -
My sewer line is shared with a neighbor — who pays when it fails?
In Seattle a shared side sewer is jointly owned by the properties it serves, and each owner is responsible for the section from their house to the…
2 min -
Side sewer, lateral, building drain, main: what do the words mean?
The building drain is the pipe inside your foundation. The side sewer (Seattle's term; elsewhere the lateral) runs from the foundation to the…
2 min
Choosing a contractor
How do I compare bids and warranties?
What a good estimate contains, what a warranty really covers, and the questions worth asking anyone who wants to dig up your yard.
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How do I compare sewer repair bids that all say something different?
Line the bids up on scope first, not price. Each should state the start and end point of the work, the method for each section, every excavation…
2 min -
What does a “lifetime” or “transferable” sewer warranty actually cover?
A sewer warranty is only as good as its written terms. “Lifetime” typically means the life of the installed pipe or liner for the original owner,…
2 min -
What should I ask a sewer contractor before I let them dig up my yard?
Ask to see the camera footage the bid is based on; ask which methods they do themselves and why this one fits your pipe; ask where every hole will…
2 min
Around the Sound
Is my area different?
Shoreline lots, hillside runs, postwar suburbs — the local conditions that change what the camera finds.
Ready when you are
Let's put a camera down the line and see.
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