Quick answer
Light brown water from a faucet is most often caused by rust or sediment stirred up in the water supply or in your home’s pipes. Common triggers are water main work or hydrant flushing, corroding iron or galvanized pipes, sediment in a water heater, or (on a private well) dissolved iron, manganese or silt.
Start by noting whether the color shows up in hot water, cold water or both, and at one faucet or all of them. That pattern points to the source.
Is brown water from a faucet safe?
It depends on the cause, and color alone cannot tell you. Rust and sediment from a short-lived disturbance are often described as an aesthetic problem rather than an immediate health concern, but you cannot be sure from appearance. Until the water runs clear, it is reasonable to take these precautions:
- Do not drink or cook with discolored water.
- Avoid washing white laundry, since rust can stain fabric.
- Avoid running hot water if you think the problem is coming from the supply, so discolored water is not drawn into your water heater.
- If the water stays discolored, smells unusual, or anyone becomes ill, contact your water utility or local health department.
Lead is invisible in water and is not what causes a brown color, but older homes may have lead service lines or lead solder. If you are concerned, ask your utility about lead testing or use a certified laboratory. Do not rely on color to decide whether your water is safe.
Start with a quick diagnosis
Run through these checks:
- Hot or cold? Fill a clear glass from the cold tap and then the hot tap.
- Only hot is brown: the cause is likely inside the water heater (sediment or a corroding tank or anode rod).
- Both are brown: the cause is likely the supply, a main line, or your home’s piping.
- One faucet or many? If only one faucet is affected, the aerator or that branch of piping is likely the cause. Many faucets points upstream.
- When does it happen? Brown water that appears first thing in the morning or after the house has been away, then clears after a minute or two, often suggests rust in older indoor pipes. Water that turns brown suddenly across the house may point to city work.
- Check with neighbors and your utility. If neighbors see the same thing, call the utility and ask about main breaks, repairs or hydrant flushing.
- Recent plumbing work? Work on your pipes or water heater can loosen deposits.
Common causes
Work or pressure changes in the city supply
Main breaks, repairs, hydrant flushing, nearby construction or heavy demand can stir up sediment and rust that coat the inside of municipal pipes. This usually shows up at every tap and often fades on its own. Calling your water utility is the quickest way to confirm.
Corroding pipes in the house
Older homes may have galvanized steel or cast iron pipes that rust from the inside. Rust can break loose when water sits overnight or when pressure changes. If you suspect corroding pipes, a plumber can inspect and advise on replacement; replumbing a house describes the process and cost factors. Aged pipes can also contribute to low water pressure.
Water heater sediment or a corroding tank
If only the hot water is brown, sediment or rust inside the tank is a common cause. Flushing the tank is a routine maintenance task, but it involves hot water and either gas or electric power. Follow the manufacturer’s instructions, turn off power or set gas controls as directed, and let the water cool. If you are unsure, hire a plumber. If the tank is old or rusting, replacement may be the better option; a rusted tank can also leak, as covered in water heater tank leaking from the bottom.
Private well issues
Wells can deliver brown or yellow-brown water from dissolved iron, manganese, tannins or silt. Heavy rain, drought or changes in the water table can change what comes out of the tap. A water test from a certified lab will tell you what is in your water and which treatment makes sense.
A single fixture
If only one faucet is affected, remove the aerator and check the screen for flakes of rust or debris.
How to fix it
Wait and flush the cold line
For a likely supply-side disturbance, a common approach is to run the cold water at a tub faucet or an outdoor spigot, often the one nearest where water enters the house, for up to 15 to 20 minutes or until it runs clear. If it does not clear in a reasonable time, stop and call your utility or a plumber. Avoid using hot water during this time.
Clean the aerators
Unscrew the aerator, rinse out sediment, and soak it in vinegar if mineral scale is present.
Flush or replace the water heater
If only hot water is brown, flush the tank according to the manufacturer’s instructions or have a plumber do it. Frequent recurring brown hot water can mean the tank is wearing out.
Treat or replace the source
If rust keeps returning, longer-term options include replacing corroded pipes, installing a whole-house sediment or iron filter, or treating well water based on lab results. Filters help with particles but are not a fix for failing pipes.
How long does it take to go away?
It depends on the cause. Short-term disturbances from city flushing or work often clear within hours, and some take a day or longer. Water that sat in pipes may clear after a few minutes of running. If it lasts more than a day or two, or keeps coming back, treat it as a sign of a deeper problem and call your utility or a plumber.
Does brown water mean a pipe burst?
Not usually. Brown water is more often rust or sediment than a burst pipe. A real leak or break tends to show other signs (see signs of a leaking pipe), such as sudden low pressure, the sound of running water, a spiking water bill, a moving water meter with everything off, or wet walls, ceilings or soil. If you see those signs, shut off the main valve and call a plumber. For how to check, see our low water pressure guide, which describes the meter test.
When to call for help
- The water has been brown for more than a day or two.
- It affects the whole house and your utility reports no work.
- You see signs of a leak or loss of pressure.
- The water smells strongly or tastes metallic or unusual.
- You have a private well and the color changed suddenly.
- You have an older home with galvanized or lead plumbing and want testing.
- Hot water is brown and the water heater is old or you are not comfortable servicing it.
If a household member is pregnant, an infant uses tap water, or anyone is immunocompromised, be extra careful and consider testing before using the water.
Related guides
FAQ
How do I fix brown water coming out of my faucet?
Identify the pattern (hot, cold, one tap, all taps). For a supply disturbance, flush the cold line for a while. For a single faucet, clean the aerator. For hot-only brown water, flush the water heater or call a plumber. Persistent cases need professional inspection or water testing.
Is brown water from a faucet safe to drink?
Do not drink it while it is discolored, since you cannot judge safety by color. Wait for it to run clear and contact your utility if it persists.
Why is my bath water brown?
The same causes apply: rust in pipes, water heater sediment, or supply disturbances. Our yellow shower water article covers bath and shower specifics.