Galvanized Pipe Leaks in Older Arlington Homes: Signs, Testing and Your Options

Galvanized steel pipes were common in homes built before about 1970. They corrode inside, so water pressure drops, water turns brown and threaded joints start to leak. If you see rust-colored water, weak flow or a damp spot near old pipe, have the leak found before you open walls. Leak detection costs about $150 to $600, depending on where the pipe runs.

Many homes near downtown Arlington, UT Arlington, Pantego and the older streets around Lake Arlington were built in the 1950s and 1960s. Some still have original galvanized lines, or a mix of galvanized and newer copper or PEX after past repairs. If you think you have a leak now, (817) 285-5426.

How do you know if your home has galvanized pipes?

Look where the main line enters the house, at the water heater and under sinks. Galvanized pipe is dull gray steel with threaded fittings. A magnet sticks to it firmly, and scratching it with a key shows silver-gray metal, not copper. Copper is reddish and soldered, PEX is plastic tubing, and polybutylene is usually gray plastic.

Pipe type	How it looks	Magnet test
Galvanized steel	Dull gray, threaded joints	Sticks firmly
Copper	Reddish brown, soldered joints	Does not stick
PEX	Red, blue or white plastic tubing	Does not stick
Polybutylene	Gray (sometimes blue) plastic	Does not stick

Do not judge by one visible pipe. Past owners often replaced the easy-to-reach sections with copper and left galvanized pipe inside walls or under the slab.

What are the signs galvanized pipes are failing?

The six common signs are brown or rusty water after the tap sits, low pressure that keeps getting worse, a hot or cold side that runs weaker than the other, damp spots or stains near pipe runs, a water meter that moves with every tap off, and leaks at threaded joints or where galvanized meets copper.

• Rusty water. Brown water in the morning or after travel points to rust inside the pipe.
• Falling pressure. Rust builds up and narrows the pipe, so flow drops a little each year.
• One fixture is weak. A branch line can clog with scale while the rest of the house seems fine.
• Stains and damp spots. Look under sinks, along baseboards and on the ceiling below bathrooms.
• A moving meter. If the meter's leak indicator spins with all taps off, water is escaping somewhere.
• Mixed metals. Where galvanized pipe was joined to copper without a dielectric union, the joint corrodes faster.

A sudden jump in your bill is often the first clue. Our guide to water leak detection arlington homeowners use explains how to read the meter.

Why do galvanized pipes leak?

The zinc coating that protects galvanized steel wears away after a few decades. Then the steel underneath rusts from the inside. Threaded joints are the weak points because the threads cut into the pipe wall, leaving less metal. Arlington's hard water and the clay soil that shifts around buried lines speed up the wear.

Underground sections fail the same way. If the leak is between the meter and the house, our guide to waterline leak detection arlington shows what that looks like in the yard.

How is a leak in old galvanized pipe found?

A technician first checks the meter to confirm a leak and isolates the house from the yard line. Then they pressure-test each section, listen along the pipe with acoustic ground mics, and use thermal imaging to find warm or wet spots inside walls and floors. The goal is to mark the leak so only one small opening is needed.

1. Confirm the leak with the meter and shut-off tests.
2. Split the system: yard line, house supply, hot side and cold side.
3. Pressure-test each section to see which one loses pressure.
4. Listen with acoustic equipment along the pipe route.
5. Use thermal imaging and moisture meters on walls, ceilings and floors.
6. Mark the spot and give you a written report.

If your home is on a slab and the leak is under the floor, it is the same process our slab leak detection in Arlington visits use. To see what happens on the day, read about a leak detection arlington visit.

Should you repair the leak or repipe the house?

A single leak in an otherwise good system can be repaired. But galvanized pipe tends to fail in many places at once. If you have rusty water, low pressure in several rooms, or a second leak within a year, replacing the old galvanized sections is usually the better long-term choice. A plumber can quote both options.

Situation	Usually makes sense
One leak, good pressure, clear water	Spot repair of that section
Leak plus rusty water or weak flow	Replace the galvanized runs
Second or third leak in a short time	Repipe the old sections
Leak in the buried yard line	Replace the line from meter to house
Selling the home soon	Repair and document, or get a repipe quote for buyers

How much does it cost to find a galvanized pipe leak in Arlington?

Finding the leak usually costs about $150 to $400 for a basic visit, $200 to $500 for a buried water line and $250 to $600 if the leak is under the slab. A spot repair through the slab is about $1,500 to $4,000. Repiping costs depend on the home and are quoted by the plumber.

Service	Approx. cost
Basic leak detection	$150 – $400
Water line leak detection	$200 – $500
Slab leak detection	$250 – $600
Slab leak spot repair	$1,500 – $4,000

A written leak report helps with insurance and with plumber quotes. Many insurance policies cover the water damage from a sudden leak but not the old pipe itself.

What should you do while you wait for help?

Turn off the water at the main shut-off if you see active leaking, and open a faucet to drain pressure. Run a tap until rusty water clears before you drink or cook with it. Take photos of stains and wet areas. Then book leak detection so the repair is made in the right spot the first time.

• Know where your main water shut-off valve is, and test that it turns.
• Do not tighten old galvanized joints hard; the threads can snap.
• Save your last few water bills to show when usage jumped.
• Move rugs and furniture away from any damp floor.

We serve older and newer homes across the city, including the 76010, 76012, 76013 and 76015 ZIP codes. For a same-day visit, our leak detection Arlington TX team answers 24/7.