Key Takeaway
The cost of replacing a residential water line depends on five things: how long the run is from the meter to the house, how deep it is buried, what sits on top of it (lawn, a walkway or a driveway), the pipe material, and the permit. A spot repair on one accessible section costs much less than a full replacement, so finding the exact leak first matters. A typical 30 to 60 foot line takes one to two days to replace. In Portland and most of Washington County the homeowner owns the pipe from the meter to the house, so the bill is yours, not the water provider's. SKS Plumbing gives a free estimate before any digging starts. Call (503) 319-9348.
The cost of replacing a water line comes down to five things: how long the run is from the meter to your house, how deep it is buried, what sits on top of it, the pipe material, and the permit. A spot repair on one section costs much less than a full replacement, which is why the first step is always finding exactly where the line has failed.
This guide walks through each of those factors for homes in Hillsboro, Beaverton and the Portland metro, so the estimate you get makes sense before anyone picks up a shovel.
Who Pays for the Water Line?
Before cost, ownership. The pipe from the street main to the meter belongs to the water provider. The pipe from the meter to your house belongs to you.
The Portland Water Bureau puts it in one sentence: "The property owner is responsible for water pipes from the meter to the house." (Portland Water Bureau, Find a Leak) Tualatin Valley Water District, which serves much of Washington County, draws the line in the same place. If you are not sure where your responsibility starts, our guide on who owns the water line from the meter to your house explains how to check.
So if the leak is on your side of the meter, the repair is yours to pay for. If water is bubbling up at or before the meter box, call your water provider first.
The Five Things That Set the Price
1. Length of the run
The single biggest factor. A house set close to the street might have 25 feet of pipe between the meter and the foundation. A home on a deep lot or a corner can have 80 feet or more. Every extra foot is more trench, more pipe and more backfill.
2. How deep the pipe is buried
Water service lines are buried below the frost line, and older lines are sometimes deeper than you would expect. A deeper trench takes longer to dig, may need shoring in loose soil, and takes longer to backfill and compact properly. The heavy clay soil common around Hillsboro and Forest Grove is slow digging when it is wet, which in the Tualatin Valley is most of the year from October to May.
3. What sits on top of the line
Lawn is the cheapest surface to dig through and put back. A garden bed costs a little more. A concrete walkway or a driveway changes the job: the concrete has to be cut, broken out and replaced after the new pipe is in. When an estimate for one house is noticeably higher than for a neighbour's, the driveway is often the reason.
4. Pipe material
We replace water service lines with copper or high-density polyethylene (HDPE), depending on local code and soil conditions. HDPE comes in long flexible coils, so a full run can often be laid with few or no joints underground. Copper is rigid and costs more for the material. Both resist corrosion and last for decades, so the choice is about the site and the code, not about one being cheap and one being good.
5. Permit and inspection
Replacing a water service line is plumbing work that normally needs a permit. The Portland Water Bureau notes that "a permit from the Bureau of Development Services Plumbing Division may be required for repairs," and Hillsboro, Beaverton and the other cities we serve have their own equivalents. The permit fee and the inspection visit are part of the cost, and the licensed contractor arranges both.
Spot Repair vs Full Replacement
This is the decision that moves the price most, so it is worth understanding.
A spot repair makes sense when the line is in reasonable shape and has failed in one place: a cracked fitting, a section crushed by a root or a vehicle, a single pinhole. We dig down to that section, cut out the damaged pipe and splice in new. On an accessible section that usually takes 3 to 5 hours.
A full replacement makes sense when:
- the line is old galvanized steel, which corrodes from the inside and keeps leaking in new places
- it has already been repaired once and is leaking again
- water pressure is low at every fixture because the pipe has narrowed with rust
- it runs under a driveway and you would rather not cut the concrete twice
For a typical 30 to 60 foot run, a full replacement takes one to two days, including the trench, the new pipe, a pressure test, backfill and putting the surface back.
Why Finding the Leak First Saves Money
The most expensive water line job is the one where the wrong section gets dug up. If you know the line is leaking but not where, leak detection comes first. Pinpointing the failure means one small hole in the yard instead of a trench along the whole run, and it tells you whether a spot repair is even possible.
You can do a quick check yourself. Close the main shut-off valve inside the house, then lift the meter lid and watch the dial or the small leak indicator for 20 to 30 minutes. If it moves while the house is shut off, the leak is between the meter and the house.
What a Water Line Estimate Should Include
When you compare estimates, check that each one covers the same work:
- the length of line being replaced, meter to house
- the pipe material and size
- excavation and backfill
- cutting and replacing any concrete, asphalt or pavers
- reconnecting at the meter and at the house shut-off valve
- the permit and inspection
- a pressure test before the trench is closed
- surface restoration: topsoil, seed or sod back where the trench was
An estimate that leaves out concrete work or the permit will look cheaper on paper and cost more by the end.
Help With the Cost in Portland
If you are a Portland Water Bureau customer, there is one more thing worth knowing. The bureau states that "leak repair assistance is available to income-qualified homeowners" through its Home Water Leak Repair Program. Check the bureau's website for eligibility before you book the work.
Get a Free Water Line Estimate
SKS Plumbing handles water main line repair and replacement on the homeowner side of the meter across Hillsboro, Beaverton, Portland and the rest of Washington County. If the pipes inside the house are failing too, ask about whole home repiping at the same visit.
We are open seven days a week, and every estimate is free and given before any digging starts. Call (503) 319-9348, or book a visit.
Frequently Asked Questions
It depends on the length of the run, how deep the pipe is buried, what has to be dug through, the pipe material and the permit. A short run under lawn costs far less than a long run under a concrete driveway. The only reliable number is an estimate for your property, which SKS Plumbing gives free before any work starts.
A spot repair is cheaper when the line is in reasonable shape and has failed in one place. If the pipe is old galvanized steel, has leaked more than once, or is corroded along its length, replacing it is usually better value, because the next leak tends to follow the first.
On the house side of the meter, the homeowner does. The Portland Water Bureau states that the property owner is responsible for water pipes from the meter to the house, and Tualatin Valley Water District draws the same line at the meter. Anything between the street main and the meter belongs to the water provider.
A typical 30 to 60 foot residential line takes one to two days, including the trench, the new pipe, a pressure test, backfill and surface restoration. A spot repair on an accessible section usually takes 3 to 5 hours.
Usually, yes. The Portland Water Bureau notes that a permit from the Bureau of Development Services Plumbing Division may be required for repairs, and other cities in the area have similar rules. The licensed plumbing contractor pulls the permit, and its cost is part of the estimate.
