Advice & guides › Prevention & Maintenance

How to Use Your Water Meter to Check for a Hidden Leak

By The FixDelivered Team · Updated 2026-07-31 · 6 min read

A hidden water leak can be a homeowner's nightmare. Not only can it lead to unexpectedly high water bills, but it can also cause significant structural damage to your property over time, leading to expensive repairs. Fortunately, there's a simple, free, and effective way to check for a hidden water leak using your home's water meter. This guide will walk you through the process, helping you perform a water meter leak test to gain peace of mind or identify a problem early.

Why Check for Hidden Water Leaks?

Hidden leaks can go unnoticed for weeks or even months, silently causing damage. They might be in your walls, under floors, or underground in your garden. Common signs of a leak can include:

An unexplained increase in your water bill.
Damp patches or staining on walls, ceilings, or floors.
The sound of running water when no taps are open.
A drop in water pressure.
Unusually lush or greener patches in your garden (if the leak is outside).

Regularly checking for leaks can save you money, prevent property damage, and conserve water – a win-win for your wallet and the environment.

What You'll Need

For this water meter leak test, you don't need any special tools. Just yourself, your water meter, and perhaps a pen and paper to note down readings.

Step-by-Step Water Meter Leak Test

Follow these steps carefully to perform an accurate check for a hidden water leak:

1. Locate Your Water Meter

Your water meter is typically located outside your property, often near the boundary, in a small underground box with a lid. It might be in your garden, driveway, or on the pavement. In some cases, especially in flats or older properties, it could be inside, perhaps under the sink, in a utility cupboard, or near the main stopcock.

2. Turn Off All Water-Using Appliances and Taps

This is a crucial step. For an accurate water meter leak test, absolutely no water should be flowing through your property. This includes:

All taps (kitchen, bathroom, garden).
Washing machines and dishwashers.
Showers and baths.
Toilets (ensure they aren't refilling).
Irrigation systems.
Any appliances with an automatic water fill, such as ice makers.

If you have a combi boiler or a hot water cylinder, ensure no hot water is being drawn or heating cycles are active during your test period. Ideally, perform this test when you know no one will inadvertently turn on a tap.

3. Read Your Water Meter

Once you're certain all water is turned off, go to your water meter. Note down the exact reading. Most modern water meters have a dial with a series of numbers (often black for cubic metres and red for litres or fractions of a cubic metre). There might also be a small red triangle, a star wheel, or a sweep hand that spins when water is flowing. If this small indicator is moving, even slightly, it's a strong sign that water is still flowing somewhere, indicating a leak.

If there's no visible movement on the small indicator, write down the full reading shown on the meter display.

4. Wait for a Period

After taking your initial reading, wait for at least 30 minutes to an hour. For a more conclusive test, especially if you suspect a very slow leak, you might want to wait for 2-4 hours, or even overnight. During this waiting period, ensure that absolutely no water is used on your property.

5. Re-Read Your Water Meter

After the waiting period, return to your water meter and take another exact reading. Compare this new reading to your initial reading.

Interpreting Your Results

If the meter reading has increased (or the small indicator is moving): This is a clear indication that water is still flowing through your pipes, meaning you likely have a leak somewhere on your property. The larger the increase, the bigger the leak.
If the meter reading remains exactly the same (and the small indicator is stationary): Congratulations! This suggests you do not have a leak within your property's plumbing system that is significant enough to register on the meter during the test period.

What to Do if You Find a Leak

If your water meter leak test indicates a leak, the next step is to try and locate it. Start by checking visible areas:

Under sinks and around toilets.
Behind washing machines and dishwashers.
Around your boiler or hot water tank (if applicable).
Outside taps and garden irrigation systems.
Check for damp spots on walls, ceilings, or floors.

If you can't find an obvious source, or if you suspect the leak is hidden within your walls, under floors, or underground, it's time to call in the professionals. Trying to tackle a hidden leak yourself can cause more damage and expense. For immediate assistance, you can find emergency plumbers near you through FixDelivered.

A qualified plumber has the specialist equipment (like acoustic leak detectors or thermal imaging cameras) to accurately pinpoint the source of the leak without unnecessary damage to your home. They can then advise on the best course of action for repair.

When to Call a Professional

While this water meter leak test is excellent for detection, fixing anything beyond a very simple, visible leak (like a dripping tap washer) typically requires professional help. You should definitely call a professional plumber if:

Your water meter indicates a leak, but you cannot locate the source.
You suspect the leak is behind walls, under floors, or within your property's main water supply pipe.
The leak is significant, causing visible damage or a noticeable drop in water pressure.
You are unsure how to safely turn off your main stopcock or isolate the water supply.
You are dealing with a burst pipe or a major escape of water.

Attempting complex plumbing repairs without the right skills or tools can lead to further damage, increased costs, and even safety risks. If you suspect a leak but can't locate it, or if you're not confident in tackling the repair yourself, don't hesitate to tell us your emergency. We can connect you with experienced, local plumbers who can diagnose and fix the issue efficiently.

Preventative Measures

Regularly performing this water meter leak test (perhaps once or twice a year) is a great preventative measure. Also, be mindful of your water bill – any sudden, unexplained increase is a red flag. Keep an eye out for damp patches, mould, or the smell of dampness.

Identifying and addressing water leaks promptly can save you thousands in potential repair costs and prevent long-term damage to your home. If you need a reliable plumber fast, FixDelivered can help you find a qualified local plumber. Learn more about how FixDelivered works and connect with trusted professionals in your area today.

Frequently asked questions

How often should I check for water leaks using my meter?

It's a good practice to perform a water meter leak test at least once or twice a year, even if you don't suspect a problem. This proactive approach can help catch small leaks before they become major issues. You should also do it immediately if you notice an unexplained spike in your water bill.

What if my water meter doesn't move, but I still suspect a leak?

If your meter doesn't register any movement during the test, it suggests there isn't a significant leak within your property's plumbing system. However, very small, intermittent leaks might not register immediately. If you have other strong indicators of a leak (e.g., damp patches, sounds of water), it's best to consult a professional plumber for a more thorough inspection with specialised equipment.

Can a small leak cause much damage?

Absolutely. Even a small, slow drip can lead to significant problems over time. It can cause wood rot, damage plasterboard, encourage mould growth, compromise structural integrity, and attract pests. These issues can be costly and disruptive to fix, which is why early detection is so important.

What are common signs of a hidden water leak?

Besides an increased water bill and a moving water meter, common signs include damp or discoloured patches on walls, ceilings, or floors; a musty smell; peeling paint or wallpaper; warped floorboards; a noticeable drop in water pressure; or the sound of running water when no taps are in use.

Need a plumber now? Tell us your emergency and FixDelivered will find and confirm an available local plumber near you, usually within the hour.

Written by the FixDelivered Team. Reviewed by Rupert Lowe, Editor. Last updated 2026-07-31.