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Repiping · Berkeley, CA
Galvanized Pipe Replacement in Berkeley
Galvanized steel water lines were common in houses built before copper took over, and many older Berkeley homes still have some. They fail slowly, from the inside, which is why the symptoms creep up on you.
Galvanized pipe is steel coated with zinc. Over decades the inside corrodes and narrows, causing low pressure, rusty or brown water and leaks at threaded joints. A magnet sticks to it. When several symptoms show up together, replacing the lines with PEX or copper is usually better than chasing leaks.
How to tell if you have galvanized pipe
- Find exposed pipe near the water heater, under a sink, or in the basement or crawl space.
- Look at the color: galvanized steel is dull gray or silver. Copper is brown or orange. PEX is plastic, often red, blue or white.
- Try a magnet. It sticks to galvanized steel, not to copper or plastic.
- Look at the joints. Galvanized pipe is joined with threaded fittings.
Many houses have a mix: copper added during a remodel, and galvanized left in the walls. Gray pipe at the meter or main shut-off is a clue that the original lines are still there.
Warning signs
- Low water pressure, especially on upper floors or at the far end of the house, as corrosion narrows the pipe.
- Brown, yellow or rusty water when a tap first opens or after the water has been off.
- Repeat leaks at threaded joints, where the steel is thinnest.
- Uneven pressure between hot and cold, or between fixtures.
Low pressure can also come from a failing pressure regulator, which is a cheaper fix. A plumber can test pressure at the main before recommending a repipe.
Partial or whole-house repipe?
| Option | When it fits | Trade-off |
|---|---|---|
| Spot repair | One leak, otherwise good flow | Cheapest now; more leaks likely in old steel |
| Partial repipe | Main line or one branch is the problem | Mix of old and new remains |
| Whole-house repipe | Low pressure throughout, rusty water, repeat leaks | Largest job, but solves the problem for the long term |
PEX or copper?
Both are code-approved replacements. PEX is flexible, so it can be fished through walls with fewer openings, which matters in old plaster. Copper is rigid and long-proven, with more wall openings to install. Your plumber should explain why they recommend one for your house. More in our repiping guide.
Reported cost
A Bay Area homeowner thread reported about $7,500 to $12,000 or more for a whole-house PEX repipe on roughly 2,000 square feet, including drywall repair. Size, number of fixtures, wall type, access and permit fees change the price. See Berkeley plumbing costs for other reported ranges.
Selling or buying? Galvanized lines often come up in home inspections. Knowing their condition early gives you time to get a written quote instead of a rushed one.
- General plumbing practice for identification and symptoms
- Reddit r/RealEstate homeowner report, Bay Area (anecdotal)
- Contractors State License Board permit and contract guidance via our hiring guide
Keep reading
Common questions
How can I tell if my house has galvanized pipes?
Look at exposed pipe near the water heater or under a sink. Galvanized steel is dull gray, uses threaded fittings, and a magnet sticks to it. Copper is brown or orange and is not magnetic.
Why is my water brown in an old house?
Corrosion inside galvanized steel pipe is a common cause. It can also come from a water heater or work on the utility main, so a plumber should check the source.
Do I have to replace all my galvanized pipes at once?
No. A spot repair or partial repipe can make sense, but when low pressure, rusty water and repeat leaks show up together, a whole-house repipe is usually better value.
Is PEX or copper better for a repipe?
Both are code-approved. PEX usually needs fewer wall openings; copper is rigid and long-proven. The right choice depends on your house and budget.
Talk to a Berkeley plumber today
You will get a straight answer, a written estimate and no pressure.