Why does your water run rusty?
Search it and every answer tells you to telephone the water utility and ask whether they have been flushing hydrants. That is written for a country where every house is on a municipal main and nobody has a tank.
In an older house here the iron is far more often coming from inside the house, and you can narrow that down tonight without paying anybody.
Four questions that place it
- Hot only, or cold as well? Hot only points at the heater's own tank, not at the pipes.
- First draw only, or all day? Clearing after a minute points inward, at pipework or a tank.
- One tap, or every tap? One tap is that branch. Every tap is the supply or the tank.
- District, or your own well? It decides whether there is anybody to ring at all.
The advice page one gives, and who it was written for
Read the results for this and you will find an American city's frequently asked questions, an American water authority, three American plumbing firms and a company selling filters. Their answer is the same: run the tap, and if it does not clear, telephone your utility, because it is probably hydrant flushing or a main break.
That advice is sound where it was written. It assumes one municipal main into every house, no storage tank anywhere in the path, and a utility with a number for exactly this. Change those assumptions and the advice stops working, and the reader concludes the problem is mysterious rather than that the article is about somewhere else.
What is usually rusting in a house like yours
Galvanised iron pipe, the old G.I. that a great many houses here were plumbed with, rusts from the inside out. It narrows year by year and sheds into the water long before it ever springs a leak, so the first sign is almost never a puddle. It is colour in the morning, and pressure that has been quietly getting worse for years.
The second suspect is the tank, and no article written for a mains-only country will mention it. Water that sits in a tank drops whatever it is carrying to the bottom, and the tank itself has an inside surface that ages. If every tap is affected and you have a tank, that is where to look before opening a wall.
Pressure that has been dropping for years, which is the same story
The third one, and it is the cheapest to rule out
If the cold water is clear and only the hot runs rusty, stop looking at the pipes. A storage water heater holds its own tankful and that tank corrodes on its own schedule. Cold clear, hot rusty is very nearly the whole diagnosis.
What else a heater does when it is on its way out
Why a filter is the wrong first move
A filter takes iron out of water that already has iron in it. If the iron is arriving because your own pipe is dissolving, the filter makes the tap look better while the pipe carries on getting thinner, and the day it finally goes you will have paid for both.
Find out where the iron is joining the water first. It costs nothing, it is four questions, and it decides whether you need a plumber, a heater, a water district or nobody at all.
When it is not our job
If the water is already discoloured before it reaches your house, it is the district's water and not your plumbing, and the call belongs to them. Most of Bulacan is served by town water districts, so there usually is somebody to ring. We will say so rather than open anything, because there is nothing here for us to fix.
And we will not tell you whether the water is safe to drink. That is a testing laboratory's answer, not a plumber's, and anybody who gives you one over the phone is guessing.
Where this comes from
The district supply point is the same one sourced on our Bulacan page: the province is served by town water districts drawing from Angat. The rest of this page is symptoms you can check at your own taps, which is why it needs no citation.
No legal limit for iron in drinking water is quoted here. There is one in the Philippine National Standards for Drinking Water, and we could not confirm the figure from a source we trust, so it is left out rather than repeated from a summary. Nothing on this page depends on it.
Questions about rusty water
- Is rusty water dangerous to drink?
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We are plumbers and not a laboratory, so we will not tell you what is safe to drink. What we can tell you is what it means mechanically: the colour is iron, and iron in the water means iron somewhere in the path it took to reach you. If you want the water itself judged, that is a water testing laboratory rather than a plumber.
- It is only rusty first thing in the morning, then it clears.
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That is the most telling pattern there is. Overnight the water sits still and whatever is loose in the pipe or the tank settles into it, and the first draw carries it to the tap. It points at the pipework or the tank rather than at the supply, because the supply does not know what time it is.
- Only the hot water is rusty.
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Then look at the heater rather than the pipes. A storage heater has a tank of its own and that tank corrodes, which is why the cold side can be clear all day while the hot side is not. Cold clear and hot rusty is close to a diagnosis on its own.
- Every tap in the house is rusty, all day.
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That points outward: the line coming in, or the storage tank everything is drawn from. If you are on a district, the district itself is worth ruling out before anybody opens anything, and that is a call to them rather than to us.
- Every guide says to ring the water utility. Is that right here?
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Only if you are on a district, and only if the discolouration is arriving from outside. Those guides are written for places where every house is on a municipal main and there is no tank. If your water comes from your own deep well, there is nobody to ring, and the pipe is yours.
- Should I just put a filter on it?
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A filter catches what is already in the water. If the iron is coming from your own corroding pipe, a filter hides that the pipe is dissolving and the pipe carries on dissolving. Worth knowing which one you have before spending anything.
- Our pipes are the old galvanised iron. Does that settle it?
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It makes it likely rather than certain. Galvanised iron rusts from the inside out, so it narrows over the years and sheds into the water long before it ever leaks. That is also why an old house often loses pressure slowly and nobody can find the leak: there is not one.
If you would rather text
A written message reaches us with the detail already in it, so we know what is wrong before we ring you back. If you would rather send it as a text, the number is on the contact page.
Monday to Sunday, 8AM–8PM
Emergency Repairs Available 24/7
Rusty in the morning, clear by lunchtime?
Say which taps do it, whether the hot side is worse, and whether you are on a district or a well. That is usually enough for us to tell you who you need.
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