Galvanized steel was the standard water pipe in many homes built before the 1960s. It corrodes from the inside, causing low pressure, rusty water and leaks at threaded joints, and it's often past its expected 40 to 60 year life. Galvanized pipe that was downstream of a lead service line can also hold and release lead. Replacement is usually done as part of a repipe with PEX or copper.
Many older homes in central Indiana, including historic houses around downtown Franklin and older neighborhoods in Greenwood, were plumbed with galvanized steel pipe. It was the standard for decades. The problem is that it corrodes from the inside, and most of it is now well past its expected life. Here’s how to identify it, what failing galvanized looks like, and what replacing it involves.
How to identify galvanized pipe
- Color: dull silver-gray; may look darker or rusty with age
- Joints: threaded fittings, not soldered or crimped
- Magnet test: a magnet sticks to galvanized steel; it doesn’t stick to copper, PEX or other plastic
- Scratch test: scratching with a key shows silvery metal, not copper color
Check where the main line enters the house, the pipes near the water heater, and any exposed lines in the basement or crawl space. Some homes have a mix: galvanized in older sections and copper or PEX where repairs were made.
Signs galvanized pipe is failing
- Low water pressure that has gotten worse over the years, especially upstairs. Rust and scale narrow the inside of the pipe. See low water pressure.
- Rusty or brown water, especially after the water has sat
- Leaks at threaded joints, where the pipe is thinnest
- Uneven pressure between fixtures
- Repeated repairs in different places
The lead concern
Galvanized pipe itself was zinc-coated, and older coatings could contain small amounts of lead. The bigger concern is galvanized pipe downstream of a lead service line: it can collect lead in its corrosion scale and release it into tap water for years, even after the lead line is replaced. Federal lead and copper rules now treat galvanized lines that were downstream of lead as needing replacement.
If you have galvanized pipe in an older home:
- Ask your water utility what your service line is made of. Indiana American Water has a program to replace customer-owned lead service lines it finds during its lead line replacement work (Indiana American Water lead service FAQs).
- Consider testing your water for lead with a certified lab.
Replacement options
| Scope | When |
|---|---|
| Replace the service line (meter to house) | Galvanized or lead line from the street. See water line replacement cost. |
| Replace exposed runs in basement or crawl space | Short-term improvement; walls still have old pipe |
| Whole-house repipe | The usual long-term fix. See whole house repipe cost. |
Most galvanized replacements use PEX because it’s less expensive and needs fewer wall openings. Copper is also an option.
Costs
Galvanized replacement is usually quoted as a repipe. National cost guides put a whole-house repipe at about $4,500 to $15,000, with PEX at the lower end and copper at the higher end, plus drywall repair. Older homes with plaster walls can cost more to access and patch.
Leaks in older homes
When galvanized pipe leaks inside a plaster wall or under an old floor, opening the wrong spot is expensive and hard to match. Hidden water leak detection with thermal imaging, moisture mapping and acoustic listening pinpoints the leak so the repair, or the repipe plan, starts in the right place.
Get it checked
We find leaks in older homes across Bargersville and Johnson County, including historic homes in Franklin and older neighborhoods in Greenwood and Whiteland.
Still can’t find it?
Our hidden water leak detection pinpoints the leak without tearing things up, so the repair starts in the right spot.
Frequently asked questions
How do I know if I have galvanized pipes?
Galvanized pipe is dull silver-gray steel with threaded joints. A magnet sticks to it, unlike copper or plastic. Scratching it with a key shows a silvery surface, not copper color.
How long do galvanized pipes last?
Commonly around 40 to 60 years, depending on water chemistry. Homes plumbed with galvanized before the 1960s are often at or past that range.
Are galvanized pipes a lead risk?
They can be. Galvanized pipe that was downstream of a lead service line can collect lead in its corrosion scale and release it later. If you have galvanized pipe in an older home, ask your utility about your service line and consider testing your water.
How much does it cost to replace galvanized pipes?
It's usually done as a repipe. National cost guides put a whole-house repipe at about $4,500 to $15,000, with PEX at the lower end. Replacing just the main service line is a separate cost.