# Interior repiping vs water service line replacement: where does each one start and stop?

> Interior repiping vs water service line replacement in Dallas: where each scope starts and what a DWU unknown-material notice means. Get an estimate.

URL: https://fullboredallasrepiping.com/guide/repiping-and-water-service-lines/

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A Dallas Water Utilities letter about your service line and a quote to repipe your house are about two different pipes. Here's where the boundary sits, who owns each side, and what we do and don't touch.

Last Updated: November 10, 2026

Key takeaways

- The service line runs underground from the DWU meter to your house. An interior repipe replaces the hot and cold piping after the main shutoff.
- Dallas Water Utilities says an unknown service-line classification is a records gap, not a finding of lead in the pipe or the water.
- DWU maintains the public side and the meter; you are responsible for the private side from the meter into the building.
- Our written estimate names the exact point where new piping ties into your existing service.
- We don't replace water service lines; that is separate work with its own contractor and approvals.

You opened a letter from Dallas Water Utilities about your service line, and now you’re wondering whether the house needs repiping. Interior repiping vs water service line replacement comes down to which pipe you mean. The service line is the buried pipe from the DWU meter to your house. An interior repipe replaces the hot and cold piping inside, starting at or just past the main shutoff. They are different jobs with different permits and contractors.

[Fullbore Dallas Repiping](https://fullboredallasrepiping.com/) replaces the water piping inside Dallas homes and commercial buildings. We don’t replace water service lines or lead service lines. This guide shows where that boundary sits on a typical Dallas lot, so a utility letter and a repipe quote don’t get mixed up.

## Where does the service line end and your house piping begin?

On most Dallas lots the DWU meter sits in a box near the street or alley. From there, a buried service line runs to the building and comes up out of the ground, usually near the front wall, the garage or a hose bib. On a slab-on-grade house it may rise inside a wall or come up through the slab.

Your main shutoff is normally where that rising pipe becomes the house’s own system. Everything after it, the trunk lines, the branches to each bathroom, the water heater connections and the fixture stub-outs, is domestic water distribution. That is what a [whole-house repipe](https://fullboredallasrepiping.com/whole-house-repiping/) or [partial repipe](https://fullboredallasrepiping.com/partial-repiping/) replaces.

### Who’s responsible for which side

The DWU Lead and Copper page describes three parts: the public side, the meter and the private side. The utility maintains the public side and the meter. You, as the owner, maintain the private side, which runs from the meter into the house and includes the plumbing inside. So the private service line and the interior piping are both yours, but they are still separate jobs.

## What the DWU letter actually means

The Dallas Water Utilities notice dated September 30, 2026 said the utility would mail letters to more than 200,000 customers whose service-line material is listed as unknown. The letters support the federal Lead and Copper Rule requirement that water systems keep a public inventory of service-line materials.

The notice is plain about what unknown means: it does not mean lead has been found in the service line or detected in the drinking water. It means DWU doesn’t yet have enough information to confirm the material. The same notice says DWU had not identified any lead service lines through its inventory work and that Dallas uses corrosion-control treatment.

### What to do with the letter

DWU asks you to complete its Customer Service Line Survey, which shows how to find the pipe where it enters the building and upload photos so the utility can decide whether more checking is needed. The [DWU Lead and Copper page](https://www.dallascityhall.com/departments/waterutilities/Pages/Lead-and-Copper-.aspx) links the survey and the public inventory map, and says the Water Quality Division offers lead testing on request through Dallas 311.

None of those steps involves repiping your house. If your water is discolored, our [brown water guide](https://fullboredallasrepiping.com/guide/brown-water-and-rusty-pipes/) covers the kind that does come from interior pipe.

Want to know where your repipe would start and stop?

Our estimate names the tie-in point at your main shutoff and lists any service-side work as excluded, so the boundary is clear before a wall is opened.

Call (469) 846-9377

## The pipe at your water heater says nothing about the service line

A house can have new PEX inside and an old service line outside, or a newer service line feeding original galvanized branches, because these sections got replaced at different times. Looking at the copper or [galvanized pipe](https://fullboredallasrepiping.com/galvanized-pipe-replacement/) at your water heater tells you about the interior only.

It works the other way too. An invoice for new [PEX repiping](https://fullboredallasrepiping.com/pex-repiping/) tells DWU, or a future buyer, nothing about the buried service. Keep each record with the section it describes. Our [pipe identification guide](https://fullboredallasrepiping.com/guide/identify-water-pipe-material/) shows how to read the interior side safely.

## Is the problem outside or inside?

Some complaints sit on one side of the boundary more often than the other. None of these proves a cause, but they tell you what to check first.

| What you notice | More likely outside (service side) | More likely inside (distribution) |
| --- | --- | --- |
| Low pressure at every fixture, hot and cold | Service leak, partly closed meter or curb valve, failing PRV at entry | Heavily scaled galvanized trunk |
| Low flow at one bathroom only | Unlikely | Restricted branch, valve or fixture cartridge |
| Brown water at hot taps only | Unlikely | Water heater sediment or steel hot lines |
| Wet soil or a running meter with everything off | Service line leak | Possible slab leak on interior lines |

For any whole-house pressure complaint, a [low pressure vs low flow check](https://fullboredallasrepiping.com/guide/low-water-pressure-vs-low-flow/) comes before a repipe quote. Static pressure at the hose bib and a look at the meter’s leak indicator with every fixture closed sort out many of these cases.

## What our estimate says about the boundary

We name the tie-in, for example: “new piping connects to the existing service at the house main shutoff, which is replaced with a full-port ball valve.” We also say whether the pressure-reducing valve (PRV) at the entry is replaced or kept, and that excavation, the private service line and any meter work are excluded.

If your service line needs work too, plan the two jobs so the new main shutoff sits where the new service line will arrive. Our [quote comparison guide](https://fullboredallasrepiping.com/guide/repiping-quotes-and-warranties/) covers the other line items, and the [Dallas home repiping guide](https://fullboredallasrepiping.com/guide/dallas-home-repiping-guide/) explains the full interior job.

## When to act and when to wait

Act quickly on a meter that spins with every fixture off, a soggy strip of yard between the meter and the house, or a sudden drop in pressure at every tap. Those point to a leak somewhere, and the service side is a suspect. Call DWU about anything at the meter.

An unknown-material letter on its own isn’t urgent in the same way. Fill in the survey and keep the letter with your property records.

## If the trouble is inside

If your concern is the piping inside, such as repeated [pinhole leaks](https://fullboredallasrepiping.com/guide/recurring-pinhole-leaks/), rusty hot water or weak flow at certain fixtures, [get an estimate](https://fullboredallasrepiping.com/contact/) for an interior repipe. Bring the DWU letter if you have one; it helps us show exactly where the interior work begins.

Questions about your house?

Call (469) 846-9377

Related service

[Whole-house repiping](https://fullboredallasrepiping.com/whole-house-repiping/)

We replace every hot and cold supply line from the main shutoff to each fixture, usually rerouted through the attic on slab houses, then tested and inspected before the walls close.

## Questions about this guide

### Does a whole-house repipe in Dallas replace the underground line from the meter?

No. A whole-house repipe replaces the water piping inside your house, starting at or just after the main shutoff. The buried service line from the Dallas Water Utilities meter to the house is a separate job, and not one we do. Our estimate names the tie-in point so nobody assumes the pipe in the yard was included.

### My DWU letter says my service line material is unknown. Should I repipe the house?

Not because of that letter. Dallas Water Utilities says an unknown classification means its records can't confirm the material, not that lead was found. The letter is about the service line outside, so an interior repipe wouldn't resolve it. Fill in the utility's service-line survey, and judge your interior pipe on its own condition.

### Can a problem in the Dallas service line look like a problem with the pipes inside?

Yes. A leak, a crushed section or a partly closed valve on the service side can drop pressure at every fixture at once, and so can badly scaled galvanized pipe inside. Checking static pressure at the hose bib, watching the meter with everything off and comparing hot and cold helps us separate the two before we quote a repipe.

Want this answered for your house?

On the first visit we trace your lines from the main shutoff to every fixture and show you what the work would involve.

Call (469) 846-9377

## More guides

- Learn [The Dallas home repiping guide](https://fullboredallasrepiping.com/guide/dallas-home-repiping-guide/)Leaks that keep coming back, rusty water, a shower that dies when the washer runs: what is going on in your pipes, and how we plan, permit, build and close up a repipe in a Dallas house.
- Learn [Brown tap water causes: is it your pipes, your water heater or the main?](https://fullboredallasrepiping.com/guide/brown-water-and-rusty-pipes/)Brown water can start at the utility main, in your water heater, or inside rusting galvanized pipe. A few checks at your taps usually tell you which.
- Learn [Low water pressure vs low flow: which one does your house have?](https://fullboredallasrepiping.com/guide/low-water-pressure-vs-low-flow/)Pressure is the push behind the water; flow is how much arrives. Your weak shower can come from either, and only one of them is fixed by new pipe.
- Learn [How to identify water pipe material in a Dallas house](https://fullboredallasrepiping.com/guide/identify-water-pipe-material/)A magnet, a flashlight and the printing on the pipe tell you more than color does. Here is where to look in your Dallas house and what each material looks like.
- Decision Guide [How to compare repiping quotes and warranties line by line](https://fullboredallasrepiping.com/guide/repiping-quotes-and-warranties/)Two repipe quotes for the same house can describe two different jobs. Lay them side by side on the same lines, then read the warranty terms for what they cover, who stands behind them and what voids them.