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 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 or partial repipe 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 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 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.
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 at your water heater tells you about the interior only.
It works the other way too. An invoice for new 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 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 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 covers the other line items, and the 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, rusty hot water or weak flow at certain fixtures, get an estimate for an interior repipe. Bring the DWU letter if you have one; it helps us show exactly where the interior work begins.