# Galvanized Pipe Replacement in Dallas

> Galvanized pipe replacement in Dallas: we replace rust-choked steel supply lines in older houses with PEX or copper, flush the scale and get it inspected.

URL: https://fullboredallasrepiping.com/galvanized-pipe-replacement/

We replace rusting galvanized steel supply lines in older Dallas houses, where the bore has closed up from the inside, with new PEX or copper, then flush the loosened scale from your fixtures.

Call (469) 846-9377

Last Updated: November 10, 2026

Flow comes back

Old steel narrows from the inside; new pipe restores the full bore to every fixture

Rough + final

The City of Dallas inspects the new lines with walls open, then again when the water is back on

The kitchen tap is fine, but the back bathroom shower drops to a trickle whenever someone flushes. The first hot water of the morning comes out the color of tea. In a house built before the mid-1960s, that is usually old steel pipe closing up from the inside. For galvanized pipe replacement, Dallas houses plumbed when zinc-coated steel was the standard are the main candidates. [Fullbore Dallas Repiping](https://fullboredallasrepiping.com/) replaces water supply lines in Dallas homes, from a single bathroom branch to the whole house.

We cut out or abandon the steel inside the agreed boundary, run new PEX or copper from the main shutoff to each fixture, then flush, test and have the City inspect the work. Where steel runs through the whole house, [whole-house repiping](https://fullboredallasrepiping.com/whole-house-repiping/) is the usual scope. Where an earlier remodel already replaced most of it, [partial repiping](https://fullboredallasrepiping.com/partial-repiping/) can finish the job.

## What we check on the first visit

First we find out how much steel is left. Galvanized is dull gray, threaded at every joint and grabs a magnet, which tells it apart from copper and plastic in seconds. We look under the sinks, at the water heater, at the hose bibbs and, in a pier-and-beam house, along the joists in the crawlspace. Many older Dallas houses are a patchwork, with copper repairs spliced into the steel over the years; our [pipe identification guide](https://fullboredallasrepiping.com/guide/identify-water-pipe-material/) shows you what to look for.

Then we measure. We read static pressure at a hose bibb near the main and compare flow at the nearest and farthest fixtures with a second tap open. Normal pressure with weak far fixtures points to the pipe itself. Low pressure everywhere points to the supply, the main valve, a pressure-reducing valve or the service line, and new pipe would not fix that. We will tell you which it is. The [low pressure versus low flow guide](https://fullboredallasrepiping.com/guide/low-water-pressure-vs-low-flow/) explains the test.

## Why the far shower goes weak

Galvanized steel is ordinary steel pipe with a zinc coating. The zinc protects the steel until it is used up, and then the steel starts to rust. Rust and minerals build on the inside wall as hard lumps, called tuberculation, that narrow the bore year after year. The outside can look fine for decades while the inside closes to a fraction of its size. Warm water speeds it up, so the hot side often goes first.

Threads are the weak point. Cutting threads removes part of the pipe wall, so threaded joints and short nipples rust through before straight runs do. A nipple at the water heater, where steel often meets copper without a proper dielectric fitting, is a classic first leak.

### Brown water from the tap?

Rusty water has more than one source. Brown water from the hot taps only, especially first thing in the morning, points to corroded steel or the water heater. Brown water from the cold taps all over the house for a few hours, then clearing, more often comes from the utility side, such as main flushing or a break nearby. The [brown water and rusty pipes guide](https://fullboredallasrepiping.com/guide/brown-water-and-rusty-pipes/) walks through the checks.

## Older Dallas neighborhoods and their pipe

Galvanized supply pipe was common in Dallas houses through roughly the 1950s and into the 1960s, before copper took over. The age of the house is a good first clue, though never proof. The U.S. Census Bureau’s 2020-2024 American Community Survey puts the median year built at 1958 in ZIP 75224 and 1960 in ZIPs 75208 and 75218, and in ZIP 75224 more than half of homes, 57.6%, were built before 1960.

Some districts are much older. The City of Dallas gives 1908 as the year Winnetka Heights in Oak Cliff was platted and describes its one-story bungalows and two-story Prairie houses. Houses of that era can have plaster walls, pier-and-beam floors and several generations of plumbing. Our [repiping old homes guide](https://fullboredallasrepiping.com/guide/repiping-old-homes/) covers those conditions, and the [Oak Cliff](https://fullboredallasrepiping.com/service-areas/oak-cliff/) and [East Dallas](https://fullboredallasrepiping.com/service-areas/east-dallas/) pages cover the neighborhoods.

Wondering how much galvanized is left in your house?

On one visit we read the pressure, compare flow at the far fixtures and trace the steel from the main to each bathroom.

Call (469) 846-9377

## Is the line from the street part of this?

No, it is a separate job. Dallas Water Utilities has sent service-line material notices to customers, and DWU says an “unknown” material is not a positive lead finding. Those notices are about the line from the meter to the house, not the pipe inside your walls, and an interior repipe does not replace the service line. A rusted steel service line can still choke flow before water reaches the house, so we check it before sizing the new pipe. The [service line guide](https://fullboredallasrepiping.com/guide/repiping-and-water-service-lines/) explains where the boundary sits.

## Will you have to open walls?

Some. On a slab house we usually run the new lines through the attic and drop them down interior walls, leaving the old steel in the slab capped and out of service. In a pier-and-beam house the crawlspace often carries the new trunk lines, and we insulate them, because a vented crawlspace can get as cold as the outdoors. Openings are still needed where lines reach each fixture, and plaster takes more care than drywall; the [wall openings guide](https://fullboredallasrepiping.com/guide/wall-openings-and-drywall-repair/) covers finish levels.

Cutting old steel knocks scale loose. After cutover we flush the lines and check the aerators, shower heads and toilet fill valves, because loosened rust collects at the first screen it reaches. Corroded stops and the main shutoff are usually replaced at the same time. In many older houses the steel pipe was also part of the electrical bonding, so when steel gives way to PEX, have an electrician confirm the bond still runs where it needs to.

Most families stay in the house. We build the new system alongside the old steel, which keeps carrying water until each area is cut over, so the outages come in windows. Your schedule says which days the kitchen, each bathroom and the laundry lose water; the [repiping water shutoffs guide](https://fullboredallasrepiping.com/guide/repiping-water-shutoffs/) explains how those are planned. We submit the permit through DallasNow, and the City inspects the rough-in before walls close and again at final.

## What galvanized replacement costs

When the whole house is replaced, the new system is PEX or copper, so our whole-house ranges apply. Our typical range for a whole-house PEX repipe in Dallas is $4,500 to $15,000 and up, and for a whole-house copper repipe $8,500 to $18,000 and up. Older houses tend to land higher in those ranges: plaster walls, pier-and-beam access, a second story and more transitions to steel that stays all add work.

For a partial job, we price it after the first visit from how much steel remains and where, the fixtures and branches, stories, slab or crawlspace access, plaster or drywall, valve and PRV replacement, the water heater connections, the permit and the patch-and-paint scope. Your written estimate lists each. The [repiping cost estimator](https://fullboredallasrepiping.com/tools/repiping-cost-estimator/) walks through the drivers, and the [Dallas repiping cost guide](https://fullboredallasrepiping.com/guide/repiping-cost-dallas/) explains how to compare quotes on the same boundary.

## Before you decide

The [repair-or-repipe guide](https://fullboredallasrepiping.com/guide/repair-or-repipe/) covers when one more repair still makes sense, and the [PEX versus copper guide](https://fullboredallasrepiping.com/guide/pex-vs-copper/) helps you pick the replacement material. If you lean toward metal, see [copper repiping](https://fullboredallasrepiping.com/copper-repiping/). For the full picture, start with the [Dallas home repiping guide](https://fullboredallasrepiping.com/guide/dallas-home-repiping-guide/).

Talk to us about your house

Call (469) 846-9377

Standards this work follows

- 2021 International Plumbing Code with City of Dallas amendments
- Dielectric or brass transition fittings where new pipe meets retained steel
- ASTM F876/F877 for PEX or ASTM B88 for copper replacement pipe
- NSF/ANSI 61 and 372 for new pipe, fittings and valves
- Flush after cutover to clear loosened scale from fixtures
- DallasNow permit, rough-in inspection with walls open, then final

## What's included

- Removal or abandonment of galvanized supply lines inside the agreed boundary
- New PEX or copper distribution from the main shutoff to each fixture served
- Dielectric or brass transitions wherever new pipe must meet steel that stays
- Replacement of corroded shutoff and stop valves on the lines being replaced
- Insulation and support for lines in crawlspaces, attics and exterior walls
- Pressure test, then a flush and aerator and cartridge cleaning after cutover
- City rough and final inspections

## Reading the symptoms in an older Dallas house

|  | Galvanized restriction inside | Supply or valve problem | Utility-side discoloration |
| --- | --- | --- | --- |
| Pattern | Flow fades worst at far fixtures and upstairs; hot side often first | Every fixture weak at once, including the hose bibb near the meter | Brown water from cold taps across the house for a few hours, then clears |
| Static pressure at the hose bibb | Normal | Low, or high with a failing PRV | Normal |
| Inside of a removed section | Rust nodules narrowing the bore | Clear pipe | Clear pipe |
| What helps | Replacing the steel lines | Fixing the PRV, main valve or service line | Running cold water until it clears; checking with Dallas Water Utilities |

## Related resources

- 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 [What changes when repiping an older Dallas home?](https://fullboredallasrepiping.com/guide/repiping-old-homes/)A 1920s bungalow or a 1950s ranch has been repaired, remodeled and patched for decades. Repiping it means planning around what's hidden as much as what you can see.
- 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.
- Learn [Interior repiping vs water service line replacement: where does each one start and stop?](https://fullboredallasrepiping.com/guide/repiping-and-water-service-lines/)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.

## How a Dallas repipe usually runs

1. First visit We count 14 fixture connections, trace the copper from the main shutoff in the garage, find the original lines running under the slab, check static pressure and the PRV, and look in the attic for headroom, insulation depth and a clear path from the garage to both bathrooms.
2. Written estimate Your estimate names PEX-A with expansion fittings, a home-run manifold beside the garage water heater, new quarter-turn stops, the old under-slab copper capped and left in place, the number and location of wall openings, and whether patch, texture and paint are included.
3. Permit Rearranging supply pipe is outside Dallas's limited exemption for stopping a leak, so the repipe is filed as permitted work through DallasNow before any pipe is cut. We keep the permit record with your estimate so you have both for your files.
4. Protection and openings Floors along the work path are covered, furniture is moved back from the wet walls, and small openings are cut behind the toilets, at each shower valve, under the sinks, at the washer box and at the kitchen sink wall.

## What this work looks like

A sectioned galvanized nipple showing rust tubercles filling most of the bore

Old galvanized supply lines with rusted threaded unions running along the floor joists of a pier-and-beam crawlspace

A brass dielectric fitting joining new copper to a short retained galvanized stub at a main shutoff

A faucet aerator screen packed with rust flakes and scale after a galvanized line cutover

Before

After

Still on galvanized supply pipe?

We read the pressure, compare flow at the far fixtures and show you how much steel is left in the house.

Call (469) 846-9377

## Galvanized pipe replacement questions

### How can I tell if my older Dallas house still has galvanized supply pipe?

Look where the pipe shows: under sinks, at the water heater, at hose bibbs and in a crawlspace or attic. Galvanized steel is dull gray, threaded at the joints and grabs a magnet; copper and plastic do not. Many older houses are mixed, with copper repairs spliced into steel, so one copper stub does not mean the whole house is copper.

### Why is only the upstairs shower weak in my galvanized Dallas house?

Galvanized pipe rusts from the inside, and the rust builds up in lumps that narrow the bore over decades. The farthest and highest fixtures lose the most because the narrowed pipe cannot carry enough water when other taps run. If pressure at the hose bibb is normal but the far shower fades, the pipe itself is the likely cause.

### Is my galvanized interior pipe the same thing as a DWU service line notice?

No. Dallas Water Utilities' service-line notices are about the line between the meter and the house, and DWU says an unknown material is not a positive lead finding. Galvanized pipe inside the house is a separate job. A rusted service line can still choke your pressure, though, so we check it on the first visit before sizing the new pipe.

### Can I replace only the worst galvanized sections in my Dallas house?

You can, as a partial repipe, but the rest of the steel keeps rusting at the same rate, and every point where new pipe meets old steel needs a dielectric or brass transition. Where most of the house is still galvanized, one replacement usually means fewer openings, fewer transitions and fewer shutoffs than doing it in pieces.

### Why do faucets clog right after a galvanized pipe replacement in Dallas?

Cutting and loosening old steel knocks rust and scale free, and some of it travels to the first screen downstream: aerators, shower heads, toilet fill valves and faucet cartridges. We flush the lines after cutover and clean the aerators and screens, and your scope says who handles a cartridge that clogs in the days after.

## Related services

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.

Partial repiping

We replace a named part of your hot and cold supply piping and leave the rest in service, with your estimate saying exactly where new pipe meets old and what stays.

Copper repiping

We repipe in rigid copper tube, sweat-soldered or press-connected, planned around your attic route, fire safety during joining and the leak history that brought you here.