Check your meter before you call anyone out
You can confirm a leak yourself with a free 15-minute meter test, reading the same black and red digits the City uses. It proves water is flowing, not where.
By Zaid Petersen, Owner and master plumber
You check for a leak by shutting off every tap and appliance in the house, writing down your meter reading, waiting 15 minutes without using any water, then reading the meter again. If the number changed or the small wheel on the dial turned, water moved somewhere on your side of the meter while everything was off. That confirms a leak is present, but it will not show you where it is. Finding the exact spot, under a tile, in a wall or under the driveway, needs more than the meter alone.
Finding your meter box and reading the black and red digits
So where is this meter? It sits in a box in the ground, usually near the pavement at the front of your property. In older Muizenberg and Fish Hoek homes the lid is often a green or black plastic flap, sometimes half under a bush. Lift it. You will see a round dial with a row of numbers.
The numbers come in two colours. The black digits on the left count full kilolitres, which is the water you pay for. The red digits on the right count litres and fractions of a litre. The City of Cape Town reads the black ones when they bill you.
For finding a leak, the red digits matter most. They move the moment any water flows, even a slow drip you cannot hear. There is also a small spinning wheel or star on the face. Watch it. If it turns while every tap is off, water is moving somewhere.
Write down the full reading, black and red together. That number is your starting point. Once you can read it, the next question is how to use it to test for a leak. For wider background, see How to read your water meter (capetown.gov.za).
The 15-minute test that shows whether water is moving through your pipes
- Turn off every tap inside and outside the house. Check the kitchen, both bathrooms, the garden taps and the washing machine.
- Make sure nothing is running on its own. Switch off the dishwasher, the washing machine and any irrigation timer.
- Open the meter box and write down the full reading, black digits and red digits together.
- Leave everything shut for 15 minutes. Do not flush a toilet or draw a glass of water in that time.
- Read the meter again and write down the new number.
- Compare the two readings. If the red digits moved, or the little wheel spun, water flowed while nothing was open.
What a moving meter proves and the one thing it can't show you
A moving meter proves one thing: water is flowing somewhere with every tap shut. That is real. A dial that crept up over your quiet 15 minutes means you have a leak on your side of the line, past the meter and the bill keeps climbing while the water runs.
But the meter has a limit. It shows flow, not location. It cannot tell you whether the water escapes under a bathroom tile, inside a wall cavity, under the driveway or from the geyser overflow. The dial turns the same for a pinhole in a galvanised pipe as it does for a running toilet valve.
That gap is where the guessing usually starts and where money gets wasted chasing the wrong wall. Tracing the exact spot takes acoustic and thermal gear, the sort used for leak detection, so nobody has to dig up the garden to find out where the pipe sits. Knowing water is moving is only half the picture. The other half is knowing whose problem it is to chase down.
Whose job it is to fix the leak and who to tell first
Past your meter, the leak is your problem, not the City's. Where the meter sits inside your boundary, the City repairs the pipe up to the meter's inlet, plus the meter itself. Everything on the house side belongs to you. Think the pipes under your floor and in your walls.
Check where the water sits first. If the meter turns with your main stopcock closed, the leak sits between the meter and that cock. It's still your section, but worth reporting. If the meter stops dead when you close the stopcock, the leak is inside the house.
Renting? Tell the owner first. Tell the landlord if you're the tenant who spotted it. A photo of the moving dial and your two readings gives them something solid, not a vague worry. Landlords and letting agents can forward that straight on to settle who pays.
The test settles whether water is moving. It won't point at the spot in the wall. Finding that still needs a trained eye and the right gear.
Frequently asked questions
Can my water meter actually tell me there's a leak?
It can tell you water is moving when it should not be, but that's not quite the same as a leak confirmed. If the red digits creep up or the little wheel spins with every tap off, something on your side is using water. It still takes a look inside to say for sure what that something is.
How much water movement counts as an actual leak and not just normal use?
Any movement at all counts, as long as every tap and appliance was off for the full 15 minutes. There's no such thing as normal use with nothing running. If the dial sat still while you had everything shut, you're in the clear. If it moved even a little, water went somewhere it shouldn't have.
If I call a plumber, will they rush through my job to get to the next one?
We can't speak for every plumber out there, but on the leak detection side the job is meant to be sorted properly on the one visit rather than rushed and revisited. Ask what the visit includes before you book, so you know what counts as done.
Will someone actually turn up when they say they will?
That depends on the company you call, which is a fair thing to ask about before you book. A clear WhatsApp or call confirming the time and someone who actually answers if plans change, is a reasonable thing to expect from anyone you bring in.
Will I be charged a fortune for something small, like a tap?
What drives the cost is how hard the leak is to find and how much work it takes to put right, not the size of the tap or pipe involved. A dripping washer is a small job. A leak hidden under a tile or behind a wall takes more time to trace. Get a quote before any work starts so you know what you're paying for and why.
Could I end up with a big bill for work that doesn't even fix the problem?
That's the real worry behind most of these questions and it's a fair one. Ask upfront whether the price you're given covers finding the leak and fixing it, or just the first visit to have a look. A written quote that matches the final invoice is the thing to check for before anyone starts.
Ready when you are
If you would like to take this further, Leak detection is the place to start.