Why is my water brown or discolored?
Water runs brown, yellow, or reddish, sometimes with visible grit, and it may stain fixtures and laundry.
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Key takeaways
- This is usually not an emergency, but it does not fix itself and it gets worse if you leave it.
- Most likely cause: Disturbed sediment in the municipal main.
- Do this first: Run the cold tap for two minutes and see whether it clears.
- Call right away if discolored water arrives with a sudden pressure loss, which can point to a service line break.
- The repair starts with: Isolate hot versus cold to identify the source.
What it is
Brown or discolored water Brown or discolored water means rust, sediment, or mineral particles have entered the water supply, usually from corroding pipes, a disturbed water main, or sediment breaking loose inside the water heater tank.
It is not usually an emergency, but discolored hot water only, paired with a rumbling tank, points to internal corrosion that should be checked soon.
The short answer
Brown or rusty water is almost always iron or sediment. Run the cold tap for two minutes first. If it clears, the disturbance came from the municipal main, often after hydrant flushing or nearby street work. If only the hot side is discolored, the water heater is shedding rust or sediment. If both sides stay discolored after flushing, the corrosion is in your own supply piping and that section needs to be replaced.
What it usually means
These are the causes we find most often, ranked from most likely to least.
- 1
Disturbed sediment in the municipal main
Most likely
Hydrant flushing or a main break stirs iron and sediment. It clears on its own.
- 2
Rust or sediment inside the water heater
Common
Discoloration on the hot side only. The tank may need flushing or replacement.
- 3
Corroding galvanized supply piping
Common
Persistent discoloration on both sides, worst after the water sits overnight.
- 4
Failed sacrificial anode rod
Less common
Once the anode is gone, the tank itself starts corroding.
- 5
Damaged or leaking water service line
Occasional
Soil and debris enter the line, often alongside a pressure drop.
What to do right now
- 1Run the cold tap for two minutes and see whether it clears.
- 2Test hot and cold separately to isolate the water heater.
- 3Check whether neighbors have the same issue, which points at the main.
- 4Hold off on laundry until the water runs clear, because iron stains fabric.
When it is an emergency
- Discolored water arrives with a sudden pressure loss, which can point to a service line break.
- Water has a sewage odor as well as discoloration.
What the fix involves
If the heater is the source, it gets flushed and the anode is checked, or the tank is replaced if it is corroding through. Where the supply piping is the source, the corroded runs are replaced, and where the service line is compromised the line is located and repaired.
- 1Isolate hot versus cold to identify the source.
- 2Flush the water heater and inspect the anode rod.
- 3Test and inspect supply piping for internal corrosion.
- 4Repipe the affected runs or repair the service line.
What drives the cost
Every job is quoted before work begins. These are the factors that move the number on this kind of repair.
- Heater flush versus tank replacement versus repiping
- Length of corroded pipe and access to it
- Excavation if the service line is involved
Related problems homeowners ask about
Why is water pressure low in my whole house?
Weak flow at every tap, showers that lose force when another fixture runs, and appliances that take much longer to fill.
Read this nextWhy is my water heater making a popping noise?
Popping, rumbling, or kettle-like sounds from the tank during a heating cycle, often loudest after heavy hot water use.
Read this nextWhy did my water bill suddenly go up?
A bill well above the seasonal norm with no change in usage, sometimes with a warm floor spot, a damp yard, or the sound of running water.
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Licenses, credentials, and company proof
- Colorado Master PlumberLicense MP-18927
- Colorado State Plumbing ContractorLicense 2110
- Family Owned & OperatedServing Denver since 2006, 20 years
- Better Business BureauAccredited Business, A+ rating
- Angie's List Super Service Award2012 through 2017
- Serving Denver since 2006Residential and commercial properties across the metro
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Before you book: pricing, timing, and guarantees
Straight answers on what brown or discolored water work costs, how fast we can get out, and what stands behind the repair.
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