Plumbing guide · Federal Way, WA
Signs of Corroded Pipes
The signs of corroded pipes are green or orange crust on exposed metal, rust-tinted water, falling pressure and small pinhole leaks. A cluster of them means a plumber should look.
(253) 540-0002- Look at exposed pipeColor, crust, flaking and damp spots.
- Check the waterTint in hot, cold or both narrows the source.
- Count the leaksMore than one pinhole points to the whole run.
Signs of corroded pipes at a glance
- Crust or rust on exposed pipeGreen, blue-green or orange marks at fittings and joints.
- Rust-tinted or metallic waterCold and hot together points to the supply pipe.
- Falling pressure at every fixtureScale and rust narrow the bore.
- Pinhole leaksOne means watch the run; several mean plan ahead.
- Hammering, drips and damp spotsSigns the system is under strain.
- Cluster beats single signSeveral together justify a plumber visit.
Signs of corroded pipes begin with how metal wears out
Four ways corrosion works.
Corrosion is a slow chemical reaction between metal and whatever touches it: water, air, soil or another metal. It does not announce itself. The signs come in three places, on the pipe you can see, in the water that comes out of the tap and in the way the house behaves, and this guide takes them in that order.
Four ways metal pipe wears out
Not all corrosion looks alike. Uniform corrosion thins a pipe evenly from the inside, so the bore narrows and the wall weakens over time. Pitting digs small, deep holes, and one pit can become a pinhole leak while the rest of the pipe looks fine. Galvanic corrosion happens where two different metals touch in the presence of water, and the weaker metal gives way. Erosion corrosion comes from fast, turbulent water wearing at bends and fittings.
Each type leaves a different clue, which is why a plumber looks at where the damage sits, not just that it exists. A leak at a joint between copper and steel tells a different story from a pinhole in the middle of a long straight run.
| Type | What happens | Typical clue |
|---|---|---|
| Uniform | Even thinning of the wall | Rust-colored water, falling pressure |
| Pitting | Small deep holes | A pinhole leak with healthy pipe around it |
| Galvanic | Two metals meet and one erodes | Crust and leaks at mixed-metal joints |
| Erosion | Fast water wears bends and fittings | Thin spots just past elbows and valves |
| Scale buildup | Mineral deposits narrow the bore | Weak flow at one fixture or the whole house |
Why age alone does not decide it
A pipe can be sixty years old and sound, or twenty years old and failing. Material, water chemistry, pressure, the soil or air around the pipe and how often it was disturbed all play a part. What matters is the condition you can observe, which is why the signs are more useful than the date on the house deed.
- MaterialSteel, copper and some plastics age differently
- Water chemistryAsk your water provider about your supply
- PressureHigh pressure strains old pipe
- SurroundingsDamp crawlspace air and wet soil speed the process
- RepairsMixed metals add galvanic risk
Signs of corroded pipes you can see on the surface
Color and texture by material.
What corrosion looks like on the pipe itself
Start where pipe is exposed: the main shutoff, the water heater connections, under sinks, in a crawlspace and along a garage wall. You are looking for color, texture and moisture. Copper wears to green or blue-green crust at fittings. Steel shows orange or brown rust, flaking and swollen areas. Brass fittings can show a pinkish or whitish crust. Plastic pipe seldom corrodes, but its metal fittings and clamps can.
Press gently with a dry finger, not a tool. A pipe that feels rough, flaky or soft at a joint deserves a closer look. Do not scrape or pick at crust, which can open a weak spot and start a leak.
| Material | Corrosion looks like | What to do |
|---|---|---|
| Copper | Green or blue-green crust, pinholes, dark spots | Photograph; ask a plumber about pitting |
| Galvanized steel | Orange-brown rust, flaking, swollen bands | Watch pressure and water color; plan ahead |
| Brass fittings | Pink or white crust, weeping threads | Have the fitting checked |
| Cast iron drain | Rust scale, flaking, thin spots | Camera look if backups occur |
| Supply clamps and hangers | Rust streaks on the pipe or framing | Replace the clamp; check for leaks |
The crawlspace check, step by step
Many Federal Way homes sit over crawlspaces, which makes the underside of the floor a good place to inspect. Wear gloves, a mask and a headlamp. Look up at the supply lines and the water heater piping, not at the soil. Moisture, drip marks on insulation, rust streaks and fresh stains are signs of a slow leak. Never crawl into a space with standing water near electrical equipment.
Gear up
Gloves, mask, headlamp, a camera or phone.
Scan the lines
Supply pipes, valves and the heater connections.
Look for water
Drips, stains, wet insulation, damp soil.
Photograph and leave
Do not touch crusted joints; call if you see a leak.
What your tap says about corroded pipes
Tint, taste, grit and pressure.
What corrosion does to the water
Corroding steel sheds rust, which tints the water orange or brown. Corroding copper can give water a bluish-green tint or a metallic taste. Sediment may settle in a glass left on the counter, or appear as grit in an aerator screen. Pressure drops when scale and rust narrow the bore, and the drop is usually felt at every fixture, not just one.
Because a water heater can also tint hot water when sediment stirs, check whether the tint is in both the hot and cold lines. Cold-only points to the supply pipe. Hot-only often points to the heater. The how to flush a water heater guide covers that second case.
| What you notice | Where it points | First check |
|---|---|---|
| Orange-brown tint, cold and hot | Rust in steel supply pipe | Run the cold tap a minute; does it clear? |
| Tint in hot water only | Sediment or heater tank | Flush the heater, retest |
| Blue-green tint or metallic taste | Copper pipe or fittings corroding | Photograph exposed pipe, ask a plumber |
| Grit in aerators | Scale or rust flakes | Clean the aerator, watch for repeats |
| Weak flow at all fixtures | Narrowed bore or a closed main | Confirm the main valve is open all the way |
| Clear after running, then returns | Water sat in pipes overnight | Note time and how long it takes to clear |
A note on lead and your own pipes
In 2016, Lakehaven, which owns most of the water mains in Federal Way, said its records back to World War II showed no lead gooseneck fittings or lead-jointed pipes in its system. Its manager also said running the tap about two minutes after six to eight hours of non-use clears stagnant water. That is a statement about the utility’s side and about 2016. The pipes and fittings inside your house are separate, and a plumber can identify what you have. Ask your water provider about current test results for your address.
- Find out what your pipes areA plumber can identify the material
- Flush after long idleRun the cold tap until it feels cold
- Use cold water for cookingHot water draws more from the heater and pipes
- Ask your water providerFor current information at your address
- Do not guess from colorRust or green crust does not tell you what is in the water
Stains, drips and pinholes: how corrosion shows in the house
The house shows what the pipe is doing.
What corrosion does to the house
Corroding pipes eventually leak. Early signs are small: a damp spot under a sink, a stain that returns after you wipe it, a slow drip at a shutoff valve, a ceiling mark under a bathroom. A pinhole in a pressurized pipe can spray a fine mist that wets framing and insulation for weeks before anything shows.
Other signs are indirect. A water bill that climbs without a change in habits, a meter that moves with everything off, or a hammering noise when a valve closes can all trace back to aging pipe. The how to find a water leak in your house guide walks through finding the leak itself.
| Sign in the house | What it may mean |
|---|---|
| Damp spot under a sink | Fitting or pinhole leak |
| Stain on ceiling below a bath | Supply or drain leak above |
| Meter moving with everything off | Water escaping somewhere |
| Bill climbing, same habits | Hidden leak |
| Hammering when a valve closes | Loose strap, high pressure or a failing valve |
| Mold smell in a closet or cabinet | Slow leak in the wall |
Pinhole leaks: small hole, real problem
A pinhole leak is a small hole through a pipe wall, often made by pitting corrosion. It may weep a few drops or spray a thin jet. The hole itself is a symptom; the pipe around it is probably thinner than it was. A clamp can slow it for a short time, but a pinhole in an old copper or steel run is also a warning about the rest. Ask whether the run should be replaced rather than patched.
Repair, replace a section or repipe
Match the fix to the failures.
Repair, replace a section or repipe
A single corroded fitting can be replaced. A short section of failed pipe can be cut out and swapped. When corrosion is spread along a run, or the material is known for trouble, a larger replacement makes more sense. Which route fits depends on how many failures you have had, where they sit and what the rest of the pipe looks like.
The pipe repair page covers section repairs. For larger replacements, the repiping page and the repiping a house: signs and cost guide explain when the whole system is the better answer.
| Situation | Leans toward | Why |
|---|---|---|
| One corroded fitting, sound pipe | Fitting replacement | Small, targeted fix |
| One failed section | Cut-out and splice | Removes the weak stretch |
| Several pinholes along a run | Replace the run | The wall is thin everywhere |
| Leaks in more than one room | Talk about repiping | The whole system is the same age |
| Known problem material | Plan a replacement | Failures are likely to continue |
What to do while you decide
Keep a dated log with photos of each sign, the meter reading and any repairs. Know where the main shutoff is, and test it now. The how to shut off your main water valve guide explains how. If you have a pinhole leak, close the nearest shutoff, dry the area and call. A person answers 24/7 and same-day service is available around Federal Way.
Log it
Photos, dates, meter readings.
Test the main
Turn it off and on while no one is bathing.
Contain a leak
Close the nearest shutoff, dry the area.
Call
Describe what you saw and where.
Slowing corrosion, and who acts in rentals and condos
Small habits, shared responsibility.
Slowing corrosion down
You cannot stop it, but you can slow it. Keep water pressure within a normal range; a regulator that has failed can strain old pipe. Replace worn valves and fittings before they fail. Use the right fittings when joining different metals, since a dielectric union limits galvanic action. Keep crawlspaces dry and ventilated, and fix drips at once, because standing moisture accelerates rust on the outside of a pipe.
Water treatment can change what enters the pipes, though it does not repair what is already inside. The water filtration and water softener installation pages explain what treatment does. Check your bill or ask your water provider about your supply before deciding.
| Habit | Why it helps |
|---|---|
| Check water pressure once a year | High pressure strains old pipe |
| Replace worn shutoff valves | Seized or leaking valves are common failure points |
| Use dielectric unions between metals | Limits galvanic corrosion |
| Keep the crawlspace dry | Outside moisture rusts steel and tarnishes copper |
| Fix drips early | A slow drip keeps a joint wet and corroding |
Renters, condos and shared lines
Census QuickFacts puts the owner-occupied rate in Federal Way at about 55 percent, so many households rent. A tenant who sees signs of corroded pipes should photograph them and report them to the landlord in writing with dates. In a condo or townhome, the shared risers and mains may belong to the association, so tell the manager before hiring anyone. Do not wait if water is leaking; close the unit valve.
| Situation | First step |
|---|---|
| Own a single-family home | Inspect, log, call about the signs |
| Tenant | Written report with photos to the landlord |
| Condo or townhome owner | Tell the manager; close the unit valve if leaking |
| Buying | Ask what pipe the house has and the repair history |
| Selling | Keep any plumber’s notes about the pipe |
Insurance and the paper trail
Photos, dates and notes.
Insurance and records
If corrosion caused a leak that damaged the house, read your policy and call your insurer to ask what they need from you. Policies differ, and this page cannot say what yours covers. Keep your photos, notes, bills and the plumber’s written summary together. They answer questions later, from an insurer, a buyer or the next plumber.
- Photos with datesPipe, stain, damage
- Meter readingsBefore and after
- BillsTwo or three months
- Plumber’s summaryWhat was found and fixed
- Your policyRead it; call your insurer with questions
When to call a plumber about pipe corrosion
These signs deserve a visit rather than another month of watching.
More than one pinhole leak
The wall is thin along the run; ask about replacement.
Rusty water at every tap
Rust is coming from the supply pipe.
Pressure dropping at all fixtures
Narrowed pipe or a failing regulator.
Green crust that is wet or growing
A fitting is weeping and corroding.
Pipe services in Federal Way, WA
Each page covers a step from repair to full replacement.
Corroded pipe questions answered
What are the signs of corroded pipes in a Federal Way home?
Does rusty water mean my pipes are corroding?
What does green crust on a copper pipe mean?
How do I tell if a pipe is galvanized steel?
Is a pinhole leak a sign I need to replace the pipe?
Can corroded pipes affect water quality?
Do I need to replace all my pipes if some are corroded?
What affects the price of fixing corroded pipes?
What should I do right away if a corroded pipe leaks?
Who handles corroded pipes in a rental or condo?
More guides for Federal Way homeowners
Seeing rust or crust on your pipes?
Call any hour. A person answers, and same-day help is available around Federal Way.