Brown water from your tap almost always means iron, rust, or sediment has been stirred up somewhere between the water main and your faucet, not a sudden contamination event. Check every cold-water faucet in your home right away and hold off on using hot water for cooking or drinking until the water runs clear. If the discoloration lasts and shows up only in hot water, report it to your utility or call a licensed plumber.
TL;DR:
- Compare cold water at indoor faucets and an outdoor spigot, then test hot water separately; widespread discoloration suggests utility trouble, while hot only suggests plumbing.
- Run one cold faucet for one to two minutes and recheck hourly; avoid hot water and laundry until the supply clears.
- Households with infants, pregnant people, or immunocompromised members should use bottled water or request testing; boiling does not remove chemical contaminants.
- Contact your utility if several cold taps are affected or discoloration lasts hours; call a plumber for hot water only, recurring discoloration, or corroded pipes.
Table of Contents
- Common causes of brown or discolored tap water
- How to tell if the problem is citywide or just your plumbing
- Is brown water safe to drink, cook with, or bathe in?
- What to do in the first hour and the first day
- When to call your utility versus a licensed plumber
- Preventing brown water before it starts again
- When a licensed plumber should take over
- What years of plumbing calls teach you about brown water
- Get a straight answer from a licensed local plumber
- FAQ
- Sources
Common causes of brown or discolored tap water
Discoloration usually traces back to one of two places: the public water main outside your home or the plumbing inside it. Municipal events tend to hit several homes in a neighborhood at once, while in-home problems usually show up at just one fixture or appear only in hot water.
On the municipal side, water-main breaks, hydrant flushing, and sudden pressure changes stir up iron and manganese that naturally settle in distribution pipes. According to Richmond’s public utilities guidance, these disturbances are the most common cause of citywide brown-water complaints, and the color usually clears after some time once sediment resettles.
In-home causes point to your own plumbing or water heater:
- Corroded iron or galvanized steel pipes shedding rust into the water supply
- Sediment buildup inside an aging water heater tank
- Rusted or worn fixtures, valves, and fittings feeding individual faucets
The color itself offers a clue. A lighter yellow or tea tint often points to iron or organic material moving through the system, while darker brown usually signals heavier rust or sediment concentration.
How to tell if the problem is citywide or just your plumbing
A short, methodical check tells you almost everything you need to know before you call anyone.
- Turn on cold water at two or three faucets in different rooms, plus an outdoor spigot if you have one, and compare the color.
- Run hot water separately from cold. If only the hot water is brown, the water heater or the hot-side pipes are the likely source, a pattern Portland’s water bureau points to directly.
- Run one cold faucet for a short period, then stop and check again after some time. Municipal sediment events typically settle out gradually.
- Unscrew and inspect faucet aerators for trapped rust flakes or grit.
- Write down the time discoloration started, which faucets are affected, and the color you see, since you will need these details if you contact your utility or a plumber.
Pro Tip: Check an outdoor spigot along with your indoor faucets. If it’s discolored too, the issue is almost certainly on the utility side, not your plumbing.
Is brown water safe to drink, cook with, or bathe in?
Brown water from iron or sediment is rarely an acute health hazard on its own, but it can stain fixtures and laundry, and in rare cases it signals a bigger plumbing issue worth checking. The safest approach is simple: use cold water once it runs clear for drinking and cooking, and avoid hot water until the whole system clears.
- Let cold taps run clear before filling a pot or glass from them
- Skip hot water for drinking or cooking during the event, since sediment tends to settle and linger in the water heater tank
- Households with infants, people who are pregnant, or anyone with a weakened immune system should use bottled water or get the supply tested rather than guess
- Boiling does not remove chemical contaminants, so if you suspect something beyond rust or sediment, contact your utility or local health department, a point the CDC makes directly
Public water systems in the United States are required to meet federal safety standards and notify customers if they fail to meet them, according to the CDC. That requirement is exactly why reporting ongoing discoloration matters: it triggers a response, not just a shrug.
What to do in the first hour and the first day
The right sequence of steps limits staining and helps you figure out whether the issue will clear on its own.
- Run a single cold-water faucet for one to two minutes, then check it again every hour rather than running multiple taps at once.
- Hold off on laundry and avoid hot water use, since both can pull more sediment through the system or set stains into fabric.
- Use bottled water for drinking and cooking until the cold supply runs consistently clear.
- Once the water clears, clean out faucet aerators to remove any trapped rust or grit before resuming normal use.
- If you need hot water, run cold first to flush the line, confirm it’s clear, then briefly run the hot tap to check its color before relying on it.
This sequence mirrors what Portland’s troubleshooting guidance recommends during an active discoloration event, and it’s the fastest way to separate a temporary nuisance from a plumbing problem that needs attention.
When to call your utility versus a licensed plumber
The faucet test you just ran tells you who to call next.
- Report it to your water utility when multiple cold taps across the home are affected, when discoloration lasts several hours, or when it follows nearby utility work like hydrant flushing or a main repair
- Call a plumber when only hot water is brown, when the problem keeps coming back, or when you notice signs of corroded or leaking pipes
- Give whoever you contact the start time, which faucets are affected, a description of the color, and whether you noticed any pressure change
- Expect a utility response that may include hydrant flushing or a repair crew, while a plumber visit typically involves a diagnostic check, a water heater flush, or a closer inspection of your pipes
Utilities often use customer reports to decide where flushing or repairs are needed next, so reporting discoloration helps your whole street, not just your own faucet, according to Richmond’s utility guidance.
Preventing brown water before it starts again
A few routine habits cut down on most in-home causes of discoloration.
- Flush your water heater on the schedule your manufacturer recommends, often once a year, to clear out sediment before it builds up
- Run faucets that sit unused for long stretches and clean aerator screens every few months
- Schedule a plumbing inspection if your home has older galvanized or iron pipes, and consider repiping if corrosion shows up in more than one spot
- Sign up for your utility’s water alerts and read its annual water quality report so you know what’s normal for your area
Pro Tip: Mark your water heater flush on the same calendar reminder as your furnace filter change. Pairing routine tasks makes them easier to remember.
For a deeper look at flushing technique and timing, our guide to essential water heater maintenance walks through the process step by step, and our piece on preventive plumbing measures covers inspection scheduling for older homes.
When a licensed plumber should take over
Some situations call for a professional rather than another hour of waiting. Hot-water-only discoloration, brown water that keeps returning, visible pipe corrosion, or any suspicion of lead or metal contamination all fall into that category. These causes can be addressed through water heater flushing and diagnostics, repiping for corroded sections, hydro jetting for stubborn sediment in drain lines, and sewer or drain inspection when the source isn’t obvious from the faucet alone.
When professionals come out for a discoloration call, they document what they find, explain the likely cause in plain terms, and coordinate water testing when it’s warranted, all with transparent quotes before any work begins.
What years of plumbing calls teach you about brown water
Most brown-water events resolve within a few hours and never threaten your health, which is why panic is rarely the right response. Checking a few faucets and skipping hot water for a day solves the overwhelming majority of cases we hear about. When the problem lingers or keeps returning, write down what you’ve observed and get a utility or licensed plumber to give you a definitive answer rather than guessing.
Get a straight answer from a licensed local plumber
If your cold water clears but the hot water stays brown, or the problem keeps coming back no matter what you try, that’s a plumbing issue worth settling for good. Free quotes and diagnostic visits are available for discoloration complaints, water heater sediment buildup, and corroded pipe sections that cause recurring rust-colored water.
A typical service visit starts with checking the water heater and the pipes feeding main fixtures, then moves to a flush, repair, or repiping recommendation depending on what is found. Book a water heater service if your hot water is the culprit, or look into repiping options if corrosion shows up in more than one spot. Reach out any time for a free quote and we’ll walk you through exactly what to expect before we start.
FAQ
Is brown water from the tap safe to drink?
Brown water from rust or sediment is usually not an acute health risk, but it’s best avoided for drinking until it runs clear, since it can carry particulates and may signal a bigger issue. Households with infants, pregnant individuals, or immunocompromised members should use bottled water or get the supply tested rather than take the risk.
How do I fix brown water coming from a tap?
Run a single cold faucet for one to two minutes, check it again hourly, and avoid hot water until the supply clears. If the discoloration is limited to hot water, flushing your water heater tank, as described in Portland’s troubleshooting guide, typically resolves it.
Is it okay to shower if my water is brown?
Showering in brown water isn’t typically dangerous, though it can stain light-colored towels or clothing and may feel unpleasant. If you’d rather wait, hold off until the cold water runs clear and avoid hot water use in the meantime.
How long does it take for brown water to go away?
Municipal sediment events usually clear within a few hours once the disturbance settles, according to Richmond’s public utilities. If your water stays discolored well beyond that, especially in hot water only, it points to an in-home plumbing or water heater issue that needs a closer look.
What should I do if only my hot water is brown?
Hot-water-only discoloration usually means sediment has built up inside your water heater tank or the hot-side pipes have corroded. A professional flush or inspection, covered in our water heater maintenance guide, typically clears it.
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