Line It or Dig It? What the Camera Has to Show First

Two good methods, sold as rival religions

Trenchless lining and open cut excavation are both entirely legitimate ways to deal with a failing side sewer. They solve different problems, they have different failure modes, and a competent contractor uses both depending on what the line needs.

What you tend to encounter instead is a company that does one of them and recommends it regardless. That is not usually dishonesty so much as equipment. A firm with a liner rig on the truck sees lining problems, and a firm set up to dig sees digging problems.

So the useful defence is not learning to prefer one method. It is knowing which findings make each method the wrong answer, so you can tell when a recommendation does not match what the camera actually showed.

What lining is and what it needs from your pipe

Cured in place lining pulls a resin saturated liner through the existing pipe and cures it into a new jointless pipe inside the old one. Access is through pits at each end rather than a trench along the whole run, so the yard, driveway and any mature landscaping survive.

Its real strength for this city is that it removes joints. In Federal Way the dominant structural fault is root intrusion at joints in pipe laid during the seventies and eighties, and roots enter through gaps rather than through sound pipe wall. A continuous liner leaves them nothing to get into.

But lining preserves the geometry of what it lines. That is the crucial limitation and it cuts three ways. If the pipe has lost its fall, the liner has the same wrong fall. If a joint is offset far enough, the liner cannot seat properly across it. And if a section has collapsed, there is nothing continuous to line through.

There is a fourth consideration people forget. A liner takes up wall thickness, so internal diameter reduces slightly. On a normally sized residential lateral that is usually irrelevant. On a line that was marginal to begin with, it is worth asking about.

What excavation does that lining cannot

Digging restores geometry. That is the whole distinction. If the problem is that the pipe is in the wrong shape or the wrong place, only excavation puts it back.

That covers a belly, where the line has settled and now holds standing water permanently. It covers a collapse or crushed section where the pipe no longer exists as a continuous tube. It covers severe offsets. And it covers replacing material that has reached the end of its life along the full run rather than at one point.

The costs are the obvious ones: a trench, disruption, reinstating whatever was on top, and on this side of King County, the permitting and timing questions that come with working in the public road.

It also has a quiet advantage worth naming. A dug and rebuilt section is bedded properly and its grade is set deliberately. On ground that has already settled once, that matters, because a repair laid back into poorly compacted material will settle again.

The six findings that decide it

One offset joint on an otherwise sound run points at a spot repair rather than either whole line method. Short dig, limited disruption, and the rest of the pipe carries on.

Root intrusion at several joints with the pipe otherwise sound and the grade good is the textbook lining case, and it is a common finding here.

A belly holding standing water means dig and re-bed that section. Lining it produces a clean pipe that fills up again immediately, which is an expensive way to change nothing.

A collapse or crushed section means excavation at the failure. There is nothing to line through.

Deterioration along the full length, or a material that is failing everywhere at once, means full replacement, whether by trench or by pipe bursting. Spending repeatedly on sections of a line failing throughout is how people pay for the job twice.

And sound pipe with grease build up is not a repair at all. It is a jetting job, and a contractor quoting a liner for that has not looked properly.

The local factors that change the maths

Ownership first. Under Lakehaven's rules the sewer service connection is privately owned and maintained, and the district puts connections within the public right of way on the property owner served by them. So a defect out under the road is still yours, and the position of the defect changes the cost profile substantially rather than changing who pays.

That is worth confirming for your own property before any of this becomes urgent, which is one of the quieter arguments for having a camera and locate done while nothing is going wrong rather than during an emergency.

That is worth confirming for your own property before any of this becomes urgent, which is one of the quieter arguments for having a camera and locate done while nothing is going wrong rather than during an emergency.

Permitting second. Sewer service work needs a Lakehaven permit and your contractor pulls it. The good news is that most sewer service repair permits carry no charge and the district tries to turn them around quickly. The variable is right of way work, which needs a separate permit and, for planned connection work, the district itself notes this can add roughly two to three weeks. The City of Federal Way also permits work in the right of way it holds.

Contractor approval third. Lakehaven requires sewer service work be carried out by a contractor licensed in Washington whose application to work within the district has been approved. That is a narrower list than simply being licensed in the state, and it is a fair question to put to anyone quoting you.

Timing fourth, and this one is genuinely worth money. Up on the plateau Federal Way sits on it matters less, but down on the valley floor a late summer excavation is simply a dig while the same work in February becomes an exercise in pumping. So when an autumn inspection turns up a defect that has not started causing trouble, put the question directly: does this have to be dealt with before the ground gets wet.

Five questions to put to whoever quotes

What did the camera show, and can I see it. If there is no footage there is no diagnosis, and everything after that point is guesswork with a price attached.

Where exactly is the defect and how deep, in metres from a fixed point. A locate should have produced surface marks. If nobody can tell you whether the problem is inside your boundary or under the road, the excavation plan does not exist yet.

Why this method rather than the other one, in terms of what the footage showed. A good answer references the grade, the joints and the material. A poor answer references what the company specialises in.

What is included in reinstatement. A price that covers the pipe and stops at a mound of spoil in the front garden is not a price for the job you want.

And what happens if you open it up and find something different. Ground work produces surprises, and a contractor who has thought about that in advance will have a clear answer rather than an improvised one. If the surprise turns out to be waste already under the house, containment and cleanup starts immediately rather than waiting for the pipe. Booking a proper camera inspection before any of this is what makes all five questions answerable.