Brown, yellow or rusty water coming out of a tap is alarming, and the instinct is to assume something is wrong with the water supply. Usually it is not. In most Melbourne homes, the cause is either sediment that has been stirred up in the mains or a pipe inside your own property that is corroding from the inside.
The quickest way to narrow it down is to notice which tap it comes from. That single observation separates three completely different problems with three completely different answers.
Start Here: Which Tap Is It?
| Where the Brown Water Appears | What It Usually Means |
|---|---|
| Hot tap only, cold runs clear | Your hot water system. The tank is corroding internally, and the water is picking up rust on the way out. |
| Cold taps too, right through the house | Either sediment disturbed in the water main, or corroding galvanised pipework on your property. |
| One cold tap only, others clear | The branch pipe serving that fixture, or a tap that is rarely used and has let sediment settle |
| Neighbours have it too. | The mains, not your property. Usually temporary, and one for your water retailer rather than a plumber |
The First Thing to Do, Before Anything Else
Run a cold tap on full for a few minutes, ideally the one closest to where the water enters the property. Yarra Valley Water advises exactly this as the first step. If the water clears, the discolouration is most likely coming from corroding galvanised pipes on your own property. If it stays brown, the cause is more likely in the mains.
While it is discoloured, do not drink it, and do not run a load of washing. Rust marks on light fabric are difficult to get out. Avoid using hot water too, because drawing hot water pulls more sediment-laden cold water into the tank, where it settles.
If It Is the Mains: Usually Temporary
Water mains carry fine mineral sediment that settles harmlessly along the bottom of the pipe. Anything that increases flow suddenly stirs it back up: a burst or repair nearby, hydrant use, a fire brigade drawing water, or scheduled flushing work.
This kind of discolouration normally clears by itself within a few hours as the sediment settles again or is flushed through. The tells are that it affects your cold water throughout the house, your neighbours have it as well, and it started suddenly rather than creeping in.
If it does not clear, contact your water retailer. Melbourne has three, and which one serves you depends on where you live: Yarra Valley Water, South East Water or Greater Western Water. They can tell you whether there is work in your area and arrange to flush the main if needed. Yarra Valley Water customers can report it on 13 27 62. This is their infrastructure and not something a plumber can or should fix on your behalf.
If It Is Your Pipes: Galvanised Steel and Older Melbourne Homes
This is the cause most people do not expect, and it is common across Melbourne’s older housing stock.
Homes built before roughly the 1970s were commonly plumbed in galvanised steel. The zinc coating protects the steel for decades, and then it stops. Once it is gone, the steel underneath corrodes from the inside, and that rust ends up in the water you are drinking, washing in and running into the kettle. Yarra Valley Water names rusting galvanised iron pipes on the property as a leading cause of yellow to rusty-brown water.
Signs it is your pipework rather than the mains:
- It has gradually worsened over months or years rather than appearing overnight.
- It is worst first thing in the morning, or after the house has been empty, when water has been sitting still in the pipes.
- It clears after running the tap for a few minutes, then comes back next morning.
- Your neighbours have no problem at all.
- Water pressure has been dropping over the same period. Corrosion narrows the bore of the pipe, so rust and low water pressure very often arrive together.
The permanent answer here is replacing the galvanised sections with copper or plastic, which is also what the retailer recommends. It is a bigger job than any filter, and it is the only thing that actually stops it.
Not Sure Whether It’s Your Pipes or the Mains?
Tell us which taps are affected, whether it clears after running, roughly how old the house is, and whether your neighbours have it too. Those four answers usually settle it before we arrive. Licensed Victorian plumbers across Melbourne, available 24/7, no call-out fee, quoted before we start.
If It Is Only the Hot Tap: That Is the Tank
Cold water clear, hot water rusty, is a different problem entirely, and it has nothing to do with your supply or your pipes.
Inside every storage hot water tank is a sacrificial anode, a metal rod whose entire job is to corrode instead of the tank. Once that rod is used up, there is nothing left protecting the steel, and the tank wall itself starts corroding. Rusty hot water is often the first visible sign that has happened.
That matters because of what comes next. A tank corroding from the inside does not recover, and eventually it perforates and leaks. If yours has started running discoloured, it is worth having looked at now rather than after it empties itself across the floor. Our guide to a hot water system leaking from the bottom covers what happens at that stage, and hot water repairs covers the cases where it is still fixable.
Where a Filter Helps, and Where It Honestly Does Not
We install water filters, so it is worth being straight about this rather than selling one into the wrong problem.
A whole-house filter sits on the main line and includes a sediment stage, so it will catch rust particles and fine sediment before they reach your taps, showers and appliances. For discolouration that comes from the mains, or for a property that gets occasional sediment events, that is a genuinely useful thing to have.
What it does not do is stop a galvanised pipe from corroding. If the rust is being generated inside your own pipework, a filter is catching the symptom while the pipe keeps deteriorating, and it will load up with sediment far faster than it should. Worse, if the corroding section sits downstream of the filter, the filter never sees it at all.
So the honest order is: work out where the rust is coming from first, fix that, and then decide whether a filter is worth adding. If the answer turns out to be your pipes, replacing them is the fix and a filter is optional. If the answer is the mains, a filter is a reasonable response. Anyone selling you a filter before that question is answered is guessing. Our water filter services page covers what each system is actually for, including under-sink reverse osmosis for drinking water specifically.
Frequently Asked Questions
Is brown tap water safe to drink?
We would not drink it while it is discoloured. In most cases the cause is sediment from the mains or rust from corroding pipes rather than contamination, but the sensible response is to stop using it for drinking and cooking, run a cold tap to see whether it clears, and contact your water retailer if it does not. They are the ones who can tell you what is happening in your area.
Why is my water brown only in the morning?
Because it has been sitting still in your pipes overnight. Stationary water in a corroding galvanised line picks up rust, and you draw that first thing. If it clears after a few minutes and returns the next morning, that pattern points firmly at your own pipework rather than the mains.
How long should discoloured water take to clear?
If it came from sediment stirred up in the mains, usually a few hours. If it is still discoloured the next day, or it keeps returning, something more than a one-off disturbance is going on and it is worth reporting to your retailer or having your pipework looked at.
Can brown water stain my clothes or fixtures?
Yes, which is why it is worth holding off on laundry until it clears. Iron deposits stain light fabrics and can leave marks in basins, baths and toilet cisterns. If you have already washed a load, do not put it through a dryer until you have checked, because heat sets the staining.
Do I call a plumber or my water company?
Run a cold tap for a few minutes first. If it clears, or the problem is confined to your property while neighbours are fine, that is your plumbing and a plumber is the right call. If it affects the whole street, started suddenly, or persists after running the tap, contact your water retailer, because the mains are theirs.
Will a water filter fix brown water permanently?
It depends entirely on where the rust is coming from. A whole-house filter with a sediment stage will catch particles arriving from the mains. It will not stop your own galvanised pipes from corroding, and if the corroding section is downstream of the filter, it will not help at all. Diagnose first, then decide.
Brown Water That Won’t Clear? We’ll Find Out Why
Licensed Victorian plumbers across every Melbourne suburb, available 24/7, with no call-out fee. We will work out whether it is your pipework, your hot water system or the mains, and tell you honestly if the answer is to call your retailer rather than pay us. Quoted before we start.
