Where Your Water Is Going: Finding a Leak Before You Call Anyone

• Water that escapes between the meter and the tap costs money every day, and it can do it for months before anything shows.
• One test answers the first question, and it takes an evening and a morning to run.
• The toilet is the first place to look rather than the last, and the check for it takes about ten minutes.
• Four places account for most of it, and only one of them usually needs somebody else.
• And there is a point where doing more yourself stops being sensible, which this article is honest about.

If your bill has moved and nothing in the house looks different, or you can hear water moving somewhere at two in the morning when everything is turned off, you are in a very common and very unpopular situation. The good news is that the first question, whether water is escaping at all, is one a household can answer for itself with ten minutes and a torch. Most household leaks announce themselves on the bill, and the bill is the last place anyone thinks to look. Let us start with the test, because everything else follows from it.

The test, in the order that works

This is a water utility’s own published procedure, and it works because the meter does not care what you believe. It just counts.

Pick a time when nothing is going to use water. Overnight is the suggestion, and it is a good one, because it removes the car washing, the dishwasher and the long showers from the picture. The longer the gap between the two readings, the more a slow leak stands out against the ordinary background noise of a household using water.

Turn everything off. Every tap, inside and out, including the garden tap and the one behind the shed that you have not thought about since summer. Then let the toilets and any tanks fill completely before you start, because a cistern that is still filling will fool the test, and topping up takes longer than people expect.

Now read the meter, and read both sets of digits, the black ones and the red ones. Write them down or take a photo, because this is the step people get vague about. Then leave everything off overnight and read it again first thing in the morning, before anybody showers.

If the second reading is higher than the first, water has passed through the meter while the house was asleep. That is not a theory about your property or a reason to worry yet. It is arithmetic, and it means the search can be narrowed to a short list. And one honest note before the list: leaks can run underground for months before anything shows on the surface, which is why the meter is the instrument here and the bill is only the evidence.

The toilet first, every time

Start where the water most often is. The cistern is the one place in a house where water is held above a drain and released by a mechanism, and a valve that no longer seals properly will run a thin trickle down the back of the bowl where nobody ever looks. It is the most common cause of a mysteriously moving bill, and it is also the cheapest thing to rule in or out, which is why it gets its own section rather than a line in a list.

The check is a piece of paper. Put it at the back of the toilet bowl at least ten minutes after a flush. If it comes back wet, the toilet is leaking, and you have your answer without a plumber, a tool or a bill.

Two more checks worth doing the same evening, because this is the utility’s own method and it costs nothing. With every tap off, put your ear to a water pipe and listen for running water. And walk the whole yard looking for a patch that is damper, greener or springier than the rest of the lawn. A greener strip beside a buried line is often the first visible sign of water that has been escaping for weeks.

One thing worth knowing, and it is why the toilet goes first: a toilet losing water can do it continuously, all day, which is why a bill moves when nothing about the household’s habits has changed. It is also the one leak most people can hear for themselves if the house is quiet.

The other three places

After the toilet, work outward. Three places cover most of what is left.

A garden tap, or a hose fitting left weeping. The simplest of the lot, and the one people forget because it is outside and does not drip where anyone stands. Check the tap itself, the fitting, and any join you can see. A drip at the spout is visible and easy to put right; water escaping below ground at the fitting shows up as the damp patch instead.

An appliance. The washing machine and the dishwasher are the obvious two, but the fridge’s water line, if it has one, is easy to miss, and a hot water system can pass water continuously through a pressure-relief valve straight into a drain, without a single drop appearing on a floor. If you know the system is at the end of its life, the site’s From leaks to no heat: when to book hot water repairs covers that territory properly, and this article will leave it there.

And the pipe between the meter and the house. This is the one that matters most, because it is the one nobody can see. If the meter is still moving with everything off, and the toilets and taps have been ruled out, then the water may be escaping from an underground pipe, which is the utility’s own published conclusion at that point. Where does it go? Often a damp patch, sometimes a greener strip of lawn, and sometimes nowhere you can see for months.

What the test does not tell you

Now the honest part, because a method that oversold itself would be worse than no method at all.

The meter test tells you whether water is escaping. It does not tell you where. It will miss a slow leak inside the house that does not run all the time, and it cannot see a leak that only happens when one particular appliance is running. A leak that only shows while the dishwasher is on was never going to announce itself overnight, so it is worth repeating the check on a day the household is using everything as normal. And a meter that did not move overnight does not prove there is no leak. It proves that nothing was leaking while the house was asleep, which is a narrower and less comforting statement.

There are two cases where the reader will still be stuck after all of this. The leak that only appears under pressure, when a system is running and the line is full. And the noise that nobody can trace, which is its own kind of maddening. Both of those are the reason the second half of this article exists. The point of the test was never to make you do the plumber’s job. It was to give the plumber something to work with, and to stop the search from starting from nothing.

When it stops being a DIY job

Here is where the article draws its line, and it is a firm one.

Call somebody if you can see water coming out of a wall, a ceiling, a floor or a cabinet. At that point the damage is already happening, and the question is not where the leak is, it is who can get to it. Call somebody if the meter keeps turning once the house has been ruled out, because the utility’s own instruction at that point is to bring in a licensed plumber. And call somebody for anything that needs a pipe opened, a fitting changed or a wall cut, because that is their work, not yours.

The one safety line that is not negotiable, and it is the sentence to remember even if you forget the rest: do not use a tool on a pipe you cannot isolate. Water you cannot shut off is water that will find you, and no saved call-out is worth that afternoon.

When you ring, have these ready. The two meter readings and the times you took them, because the times turn two numbers into a story. What you have already checked, and what you found. How long the problem has been going on, and whether it is the bill that moved or the water you can see. A list like that turns the visit into a short job. And while you wait, the site’s Top signs your home pipes need repairs is the symptom list worth checking yourself against, and its Think you don’t need a plumber? Here’s what you might be overlooking covers the other jobs that quietly wait for a better moment.

Leak detection exists as a service because finding a buried leak is its own job, and it is worth asking, when you book, whether the person doing the work is registered for it. No fuss, just a question, the same way you would ask anyone working on your home. It is also the question a Werribee plumber who does leak detection across Melbourne’s west expects to hear, and the answer should be easy to give.

Where a leak is your problem and where it is not

This section matters because it is the reason the ten minutes are worth spending.

A water utility’s own published position is that a leak on the property side of the meter is the customer’s responsibility, including the water that was lost. Read that carefully, because it says two things: the repair is yours to arrange, and so is the charge for every litre that escaped while you were deciding. An unrepaired leak is a repair bill and a running cost at the same time, and the running cost does not stop. That is the sentence worth re-reading, because it is why the whole article pushes you to look tonight rather than at the end of the month.

What sits on the other side of the meter, who maintains it and who to ring about it are things that differ from area to area and property to property. So the correct move there is not to guess. Ring the water corporation for your property and ask, and they will tell you where their responsibility starts and yours begins. That answer, from them, will be better than anything this article could promise, because it depends on your meter, your boundary and your street.

The ten minutes that answer most of it

Here is the whole thing, short enough to read standing at the fence.

Turn everything off. Let the cisterns fill. Read both sets of digits and write them down, and keep them somewhere you will find them again, because a plumber will ask for them. Read again in the morning before anyone showers, and compare. Then check the toilet with a piece of paper, listen at a pipe, and walk the yard looking for the patch that does not match the rest. If the toilet is the answer, you have saved yourself a call. If the meter is still moving after all of that, you now have everything a plumber needs to start.

The bill is the last place anyone looks, and the meter is the first place that answers. Ten minutes with a torch is cheaper than another quarter of guessing.

Sources consulted: published water utility guidance on checking for leaks at home.