Why Is My Tap Water Brown or Yellow?
Brown, yellow or orange water usually means iron or manganese, most often stirred up in the water mains after a main break, hydrant use or flushing. Run the cold tap for a few minutes. If every tap is affected and it does not clear, call your utility; if only one tap or only hot water is discolored, the cause is in your home.
Where is it discolored?
Run the hot tap, then the cold tap, at more than one sink. One choice gives you the likely source and what to do.
All five cases as a list
- Only hot water is discoloredUsually points to: Sediment or corrosion inside the water heater.What to do: The heater may need flushing or inspection by a plumber.
- Cold water is discolored at every tapUsually points to: Iron or manganese from the water mains, often after a main break, hydrant use or flushing.What to do: Run the cold tap for a few minutes. Hold off on laundry until it runs clear, so clothes don't stain.
- Every tap, and it does not clearUsually points to: The supply or your service line.What to do: Call your utility and say when it started and whether the street has had work done.
- Only one faucet, or only the first water in the morningUsually points to: Rusting galvanized or iron pipes in that part of the home.What to do: A plumber can check the pipes. Rusting pipes are also a reason to test for lead.
- It clears after a few minutes of runningUsually points to: Sediment disturbed in the mains or your pipes.What to do: Usually a nuisance. If it keeps happening, tell your utility.
Two nuisances, two worth testing
- Nuisance: changes look, smell or taste
Iron stirred up in the mains
Rusty, yellow or orange color at every cold tap, often after a main break or flushing. EPA's guidance level for iron is 0.3 mg/L; above it water can look rusty and stain laundry and fixtures.
- Worth testing
Manganese
Brown-to-black color or black specks and stains. EPA's guidance level for appearance is 0.05 mg/L. Minnesota's health department advises keeping manganese at or below 100 µg/L in water an infant drinks or that is used for formula.
- Worth testing
Rusting pipes in the home
One tap, or the first water after it sat overnight, in an older home with galvanized or iron pipes.
- Nuisance: changes look, smell or taste
Water heater sediment
Only hot water is discolored.
When to call your utility
- Call your utility if discolored water is at every tap and does not clear after a few minutes of running the cold tap.
- Utilities often know about main breaks and flushing on your street and can say how long it will last.
- Your utility's phone number and website are on your city or utility page here: search your address, city or ZIP below.
On a private well, iron and manganese usually come from the groundwater itself. A certified lab test shows the levels; the treatment (a softener, an iron filter or oxidation and filtration) depends on them. Homes with infants should test for manganese. Private well water by state and county.
Frequently asked
- US EPA, “Secondary Drinking Water Standards: Guidance for Nuisance Chemicals”
- Minnesota Department of Health, “Manganese in Drinking Water”
- Penn State Extension, “Iron and Manganese in Private Water Systems”
Reviewed October 7, 2026 by the PurityMap Editorial Team. Prepared with AI assistance. General information, not medical advice. Your utility's records describe the water system, not the water at your tap. Health disclaimer · Spot a mistake? Send a correction.
How long should I run the tap if my water is brown?
Run the cold tap for a few minutes. If it does not clear, wait an hour or two and try again, and call your utility if it still does not clear. Avoid hot water and laundry until it runs clear.
Can I drink brown or yellow water?
It depends on what causes it. Iron mainly affects color and taste; manganese has health guidance for infants, and rusting home pipes can come with lead. Until it runs clear, use another source for drinking and formula, and call your utility if it does not clear.
Why is only my hot water brown?
Sediment or corrosion inside the water heater. Flushing the tank, or an inspection by a plumber, usually fixes it.