Why Your Water Bill Suddenly Increased: 8 Plumbing Problems That Could Be Costing You Money
- Kate Clanchy
- Aug 3
- 4 min read
Opening your water bill only to find it's significantly higher than usual can be frustrating—especially if your household habits haven't changed. While seasonal water use, extra guests or filling a swimming pool can all contribute to increased consumption, a sudden spike in your water bill is often a sign that something isn't quite right with your plumbing.
The good news is that many of the most common causes can be identified and repaired before they become expensive problems.
If you've noticed your water bill creeping up, here are eight plumbing issues that could be costing you money.
1. Hidden Water Leaks
Not all plumbing leaks are obvious. Many occur underground, inside walls or beneath concrete slabs, where they can go unnoticed for weeks or even months.
Signs of a hidden leak include:
An unexplained increase in your water bill
Damp patches on walls or floors
Mould or mildew growth
Water stains on ceilings
Constant sounds of running water
Low water pressure
Even a small leak can waste thousands of litres of water each year if left unrepaired.
2. A Leaking Toilet
A leaking toilet is one of the biggest causes of unnecessary water waste in Australian homes.
Often, the leak is so quiet that homeowners don't realise it's happening. A worn flush valve or faulty cistern seal can allow water to continuously trickle into the bowl, significantly increasing your water usage.
A simple way to check is to place a few drops of food colouring into the cistern. If the colour appears in the bowl without flushing, your toilet is leaking.
Another way to check is to roll up a piece of toilet paper and hold it to the back of your toilet bowl. If there is water leaking the paper will wick up the water and become very wet.
3. Dripping Taps
A dripping tap might seem like a minor annoyance, but over time those constant drips can waste a surprising amount of water.
Worn washers, damaged cartridges or ageing tapware are common causes and are usually inexpensive to repair compared to the ongoing cost of wasted water.
4. Underground Pipe Leaks
Water pipes running beneath your yard or driveway can develop leaks due to corrosion, tree roots, shifting soil or ageing infrastructure.
Because these leaks aren't visible, many homeowners only discover them after receiving an unusually high water bill.
Professional leak detection equipment allows plumbers to accurately locate underground leaks with minimal disruption to your property, however if you have already ruled out a toilet or tap leak you can check for a pipe leak yourself. We include instructions below under the heading “How to check for a hidden water leak”.
5. Faulty Pressure Limiting Valves
High water pressure might feel great in the shower, but it can significantly increase water consumption throughout your home.
Excessive pressure also places additional strain on pipes, taps, flexible hoses and appliances, increasing the likelihood of future leaks.
A plumber can test your water pressure and replace a faulty pressure limiting valve if required.
6. Irrigation System Leaks
Automatic irrigation systems are convenient, but damaged sprinkler heads, leaking underground pipes or faulty timers can waste large volumes of water without you noticing.
It's worth inspecting your irrigation system regularly, particularly after mowing, landscaping or heavy rain.
7. Hot Water System Problems
If your hot water system is leaking, it may be losing water continuously.
Signs to look for include:
Water pooling around the unit
Rust or corrosion
Unusual noises
Reduced hot water performance
Water discharging from the overflow pipe
A leaking hot water system should be inspected promptly to avoid further damage and unnecessary water loss.
8. Ageing Plumbing
Older homes throughout South East Queensland may still have ageing pipes and plumbing fixtures that are approaching the end of their service life.
Corrosion, worn joints and deteriorating pipework can all contribute to small leaks that gradually increase water consumption.
Regular plumbing inspections can identify these issues early, allowing repairs before they become major problems.
How to Check for a Hidden Water Leak
If you suspect a plumbing leak, you can perform a simple test at home:
Turn off all taps, appliances and irrigation systems.
Make sure nobody uses water during the test.
Locate your water meter and record the reading.
Wait at least 30 to 60 minutes.
Check the meter again.
If the reading has changed, it's likely water is escaping somewhere within your plumbing system.
While this won't tell you where the leak is, it does indicate that further investigation is needed.
Why Early Leak Detection Saves Money
Ignoring a plumbing leak rarely saves money. In fact, even small leaks can lead to:
Higher water bills
Water damage to your home
Mould growth
Structural damage
Increased repair costs
Reduced property value
The earlier a leak is identified, the easier—and often less expensive—it is to repair.
How Hughes Plumbing Can Help
At Hughes Plumbing, we provide professional leak detection, pipe repairs and general plumbing maintenance for homes, businesses and rural properties across South East Queensland.
Using modern diagnostic equipment, our experienced plumbers can locate hidden leaks, identify the cause of increased water usage and recommend the most cost-effective repair solution.
Whether it's a leaking toilet, underground pipe, faulty pressure valve or ageing plumbing, we'll help stop unnecessary water waste and get your plumbing back in top condition.
If your latest water bill has come as an unwelcome surprise, don't ignore it. Contact Hughes Plumbing today to arrange a professional plumbing inspection and discover what's really causing your water usage to increase.
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