Turning on a tap and watching brown water pour out is unsettling, but before you assume the worst, take a breath. Discoloured water is almost always caused by sediment or rust particles, and a few quick checks will tell you whether the source is the street supply, your own pipework or your hot water system. Each has a very different fix, and working out which one you are dealing with takes about five minutes. Here is how we diagnose it.
Check one, is it every tap or just one
Run the cold water at several taps around the house. If every cold tap runs brown, the problem is almost certainly upstream of your home, either in the street mains or in the pipe between the meter and the house. Water Corporation works, burst mains, hydrant testing and even heavy demand nearby can stir up the mineral sediment that settles naturally inside water mains, and that sediment ends up at your taps. If only one tap runs brown, the issue is local to that fixture or its branch pipework, which narrows things down considerably.
Check two, is it hot, cold or both
This is the most telling test. If cold water runs clear but hot water runs brown, your hot water system is the culprit. Storage tanks accumulate sediment at the bottom over years of heating cycles, and a corroding sacrificial anode or tank lining will stain the water rust brown. Discoloured hot water in a system more than eight or ten years old is often the first warning that the tank is corroding from the inside, and it deserves prompt attention, because the next stage of that process is a leaking tank.
Check three, does it clear with running
Let the affected cold tap run for two to three minutes. Mains disturbance sediment usually flushes through and the water clears, first at outside taps and then indoors. If the water clears and stays clear, the event has passed and no action is needed beyond avoiding the washing machine for an hour or so, since iron sediment can stain a white load. If brown water keeps returning day after day with no works in your street, the source is more likely your own pipes.
The older home factor
Perth’s older suburbs are where we see persistent brown water most often, and the reason is galvanised steel pipework. Homes built up to around the 1970s commonly used galvanised pipe, and after several decades the zinc coating fails and the steel beneath rusts. The rust narrows the pipe from the inside, flakes into the water and shows up as discolouration that never quite goes away, along with falling water pressure. There is no cleaning process that reverses internal pipe corrosion. Once galvanised pipe reaches this stage, replacement of the affected sections with copper or modern polymer pipe is the only lasting fix, and it is a job we can stage room by room to spread the work.
Is brown water dangerous
Generally the discolouration is iron and manganese sediment, which looks terrible but is not considered a health hazard at the concentrations involved. That said, we do not recommend drinking visibly discoloured water, and you should not use it for infant formula. If discolouration arrives with an unusual taste, a chemical or sulphur smell, or after any work on your own bore or rainwater connections, stop using the water for drinking and get it checked. Trust your senses and err on the side of caution.
What to do next
If every tap in the street is affected, report it to Water Corporation and let the mains flush through. If it is just your house, the diagnosis order is hot water system first, then internal pipework. Our team carries the equipment to inspect and test both, and because we spend our working lives inside Perth plumbing, we can usually tell you within one visit whether you are looking at a simple flush, an anode replacement, a tank at end of life or ageing pipework. We service the northern suburbs from our Greenwood base 24 hours a day, and travel south when needed. If your water has turned brown and stayed brown, call Drains Plus and we will find the source.
A note on timing patterns, because they carry diagnostic value. Brown water first thing in the morning that clears with a minute of running points to sediment settling in your own pipes overnight, typically a symptom of internal corrosion. Brown water that appears suddenly mid morning on a weekday is far more likely to be works or flushing activity in the street mains. Brown water only after heavy use, such as filling a bath or running irrigation, suggests sediment in the pipe between the meter and the house being stirred by high flow. Noting when it happens, and mentioning it when you call, genuinely shortens the diagnosis.
Bore water deserves its own mention, because so many Perth properties run a bore for garden reticulation. Bore water is naturally high in iron, and it stains everything it touches over time, which is why so many fences and driveways in the northern suburbs carry that familiar orange wash. If your bore is cross connected to anything it should not be, or a retic fitting is leaking near the drinking water line, iron staining can appear where you least expect it. Any unexplained discolouration in a property with a bore should include the bore setup in the inspection.
