Quick answer
Galvanized steel water pipe, common in homes built before about 1960, rusts from the inside as its zinc coating wears away. The signs are low pressure, brown or rusty water after the tap sits, and leaks at threaded joints. EPA notes galvanized pipe can also collect lead from an upstream lead service line and release it. Replacement means repiping with PEX or copper; HomeAdvisor puts a whole-house repipe at about $4.50 per square foot of house. Call (888) 217-6781 to reach a plumbing company taking calls in your ZIP.
Follow the short menu, then your 5-digit ZIP. The line goes quiet for a few seconds while it connects; stay on. If it does not connect, call once more: companies taking calls change minute to minute.
Written & reviewed by Marcus ReedIICRC WRT
Reviewed November 4, 2026· Next review May 2027
Galvanized pipe is steel pipe coated in zinc, and it was the standard water supply pipe in many US homes built before about 1960. How many homes in your state date from then is in home plumbing age by state. The zinc slowly wears away, and the steel underneath rusts from the inside. The pipe narrows with scale, pressure drops, and eventually the threaded joints leak.
How to Identify It
- Color: dull silver-gray, sometimes darkened with age.
- Magnet: a magnet sticks to galvanized steel, not to copper, brass or plastic.
- Joints: threaded fittings, often with rust stains at the threads.
- Where to look: the main shutoff, the basement or crawl space, and the pipes at the water heater.
Signs It Needs Replacing
| Sign | Why |
|---|---|
| Low pressure, worse on upper floors | Scale narrowing the pipe inside |
| Brown or rusty water, especially first thing in the morning | Rust from the inside wall |
| Pressure good at one faucet, poor at another | One branch more corroded than others |
| Leaks at threaded joints | Threads are the thinnest point |
| Hot side worse than cold | Hot water speeds corrosion |
For a pressure problem that is not the pipe, see low water pressure in the shower and who to call for low water pressure.
Talk to a plumber about this
One call reaches a plumbing company taking calls in your ZIP.
The Lead Question
EPA notes that galvanized pipe downstream of a lead service line, now or in the past, can collect lead and release it into the water. In an older home, ask the water utility what the service line is made of, and test the water.
Repair or Repipe
A single leaking section can be replaced, but rust from the rest keeps narrowing the system, and joining steel to copper needs a dielectric fitting to avoid fast corrosion. Most plumbers recommend replacing the supply lines with PEX or copper together. HomeAdvisor puts a whole-house repipe at about $4.50 per square foot of house. See repipe house cost and repiping.
The Call
Call when pressure has dropped across the house, the water runs brown, or a threaded joint is leaking. (888) 217-6781 connects you to a plumbing company taking calls in your ZIP. Follow the short menu, enter your 5-digit ZIP and stay on while it connects; if it does not connect, call once more, because the companies taking calls change minute to minute.
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Frequently Asked Questions
How long do galvanized pipes last?
Commonly 40 to 60 years, depending on the water. Many still in service are past that, which is why pressure and rust problems are common in older homes.
Are galvanized pipes dangerous?
The main problems are rust, low pressure and leaks. EPA also notes galvanized pipe can collect lead from an upstream lead service line and release it, so testing the water is sensible in older homes.
Can I replace only part of the galvanized pipe?
YesBut rust from remaining sections keeps lowering pressure, and joining dissimilar metals needs the right fittings.
Many plumbers recommend replacing the supply lines together.
How much does it cost to replace galvanized pipes?
HomeAdvisor puts a whole-house repipe at about $4.50 per square foot of house, with labor about 70% of the total.
Sources
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Disclaimer: HearthDry is an independent educational resource. This article is for informational purposes only and does not constitute professional, legal, or insurance advice. Consult licensed professionals before making decisions about your property or insurance claims.
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