Signs You Have a Hidden Water Leak at Home
A water leak is one of the most destructive plumbing issues you can face at home. The longer it’s left unchecked, the greater the risk of serious structural damage. The other issue is that they’re often hidden and sometimes invisible to the naked eye.
To help you out, we’ve compiled a quick and simple guide to the most common signs you have a hidden water leak at home. Read on to learn more or call us directly to arrange an inspection!
High Water Bills
Compared to gas and electricity, water bills are generally affordable and won’t burn a hole in your pocket. If they rise unexpectedly (especially without a valid reason), this is usually a cause for concern.
If your household habits haven’t changed, the reason behind the jump just might be a hidden leak. Because hidden leaks usually occur in cracked or broken pipes underground, in walls, underneath paving or driveways, overall water usage can grow significantly without your knowledge.
Unless you can point to a specific reason, the best way to deal with a dramatic rise in your water bill is to call in a professional plumber.
Patches, Stains, and Discolouration Indoors
This is another telltale sign. Although these issues aren’t exclusively caused by a hidden water leak, unexplained patches, stains and discolouration on your walls or ceilings deserve some attention.
A small stain that gradually gets darker or larger could indicate water is finding its way through the wall, ceiling or roof space. You might also notice bubbling or peeling paint, swollen plasterboard or wallpaper beginning to lift away from the surface. These problems can start subtly before becoming considerably more noticeable.
Don’t simply paint over the affected area and assume the problem has gone away. If water is getting into your home from a concealed pipe, the underlying leak will continue until the source is identified and repaired.

A Running Toilet
Not every hidden leak is buried beneath the house. Your toilet can waste a surprising amount of water without producing an obvious puddle, particularly when the cistern has a faulty valve, seal or other internal component.
A toilet that keeps running after you’ve flushed it is an obvious warning sign. Sometimes, the leak is a little more quiet and harder to notice. You may hear a faint trickling sound from the toilet when nobody has used it, or notice that the cistern seems to refill by itself.
If the problem persists after checking that the handle and flush mechanism are working correctly, a plumber can determine whether a faulty component needs to be repaired or replaced.
Low Water Pressure
Low water pressure tends to make everyday tasks surprisingly frustrating. The shower takes longer to rinse shampoo out, taps feel weaker than usual and appliances that rely on a steady water supply may not perform as expected.
There are plenty of potential causes, including issues with the mains supply, blocked pipes and faulty fixtures. If water is escaping from a damaged pipe before it reaches your taps, there may simply be less pressure available where you need it.
Pay close attention if the change happens suddenly rather than gradually.
Warm Spot on the Floor
Have you noticed one particular section of your floor feels noticeably warmer than the rest? If you have concrete flooring and hot water pipes running beneath it, an unexplained warm patch can sometimes be a sign that hot water is escaping from a damaged pipe.
Maybe you’ve noticed the difference while walking around barefoot, particularly if the area where the hot water hasn’t been running stays warm. In some cases, the surrounding flooring may eventually show other signs of moisture or damage as well.
Don’t ignore an unexplained warm spot simply because there isn’t any visible water, and if you’re tossing up whether to get it checked out, the general rule is the sooner the better.
Patches in Your Grass
Your garden can sometimes reveal a plumbing problem before anything inside the house does. A particularly lush or unusually green patch of grass might look like a sign that you’ve been doing a great job with the garden, but it could have another explanation.
If one section of your lawn is greener, wetter or growing faster than the surrounding grass despite receiving the same amount of water and sunlight, a leaking underground pipe could be responsible. You might also notice soggy soil, unexplained puddles or an area that never seems to dry out.
Underground leaks can be difficult to locate because the water doesn’t necessarily appear directly above the damaged pipe. Instead, it can travel through surrounding soil before reaching the surface. If your lawn is behaving strangely and you haven’t changed your watering routine, it’s worth having the plumbing checked.

Should I Call a Plumber? How Can They Help?
The tricky thing about hidden leaks is that the visible symptom isn’t always located anywhere near the actual source. So, if you’ve noticed one or more of the signs above, calling a plumber is a sensible next step.
Here’s how a plumber can help you out:
Locating the Source: Finding the leak first is really important, and a plumber will be able to combine cutting-edge equipment with years of hands-on experience to find out exactly what’s going on.
Advice and Recommendations: Once the scope, source, and extent of the issue is found, you should receive advice and recommendations on the next steps.
Quote and Follow-Up Work: If there is a hidden leak at play, the plumber should provide a quote for any follow-up work that may be required, then arrange a time for the work to occur if it can’t be fixed on the spot.
Think you might have a hidden water leak? Reach out to MCN Plumbing Perth Today

Get a Quick Response from MCN Plumbing Perth
Noticed any of the signs above? Get on the front foot and reach out to our friendly team today.
We service the entire metropolitan Perth area. So, if you need a plumber in Como, Fremantle, Maylands, Subiaco or Yokine, we’ve got your back. All of our staff are licensed, insured, experienced, and equipped with the knowhow to identify hidden leaks in your home.
Contact MCN Plumbing Perth today on 0418 871 934 to get your home checked for hidden water leaks and any other issues that may be present.
Frequently Asked Questions
How can I tell if I have a water leak in my house?
An unexplained increase in your water bill is one of the easiest signs to spot, particularly if your water usage hasn’t changed. Damp patches, mould or musty smells, low water pressure, running toilets, unusual sounds and unexplained wet areas around the property can also point towards a leak.
Can a water leak go unnoticed for a long time?
Yes, particularly when the damaged pipe is hidden behind a wall, beneath a floor or underground. A small leak may not produce any obvious puddle or visible damage at first, allowing the problem to continue until other signs eventually appear.
Why has my water bill suddenly increased?
A sudden increase can have several causes, including changes in household water usage, seasonal conditions or a hidden leak. If your habits haven’t changed and the higher bills continue, having your plumbing checked can help determine whether water is escaping somewhere you can’t see.
Can a plumber find a leak without breaking walls or floors?
In many cases, yes. Professional plumbers have access to leak detection equipment that can help locate concealed leaks without immediately resorting to cutting into walls, floors or other surfaces.
Is a small water leak really a big problem?
Even a small leak can cause problems if it continues for long enough. Apart from wasting water, ongoing moisture can contribute to mould, damage building materials and cause deterioration around the affected area.
Why is my lawn suddenly greener in one spot?
An unusually green or lush patch can sometimes indicate an underground water leak, particularly if the rest of the lawn is receiving the same amount of water. Wet soil, unexplained puddles or an area that stays damp can provide further clues that something is happening below the surface.
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