Receiving a notification from Thames Water that there’s a leak on your property can be stressful, especially when it states the responsibility lies with you. Typically, this means the problem is on your supply pipe or internal plumbing rather than the main network under the street i.e. within your property boundary. Knowing this early is crucial because the longer a water leak goes unchecked, the higher the risk of property damage, wasted water, and rising bills.
Thames Water monitors properties through meter readings and smart monitoring technology. Continuous flow when no water is being used or a sudden spike in usage can indicate a leak. These alerts allow Thames Water to notify homeowners promptly. According to Thames Water, property-side leaks account for a significant portion of water loss in their supply area, highlighting the importance of swift action.
Acting quickly also helps reduce environmental impact. Leaks not only cost money but contribute to unnecessary water wastage, which Thames Water and Ofwat aim to reduce through early detection initiatives.
How Thames Water identifies property leaks
Thames Water relies on two main systems to detect leaks: water meter monitoring and district metered areas (DMAs). Smart meters can detect unusual continuous usage patterns, sending alerts when water is flowing when it shouldn’t be. This technology has significantly reduced the time leaks go unnoticed, with Ofwat noting that smart meters are vital in helping households spot issues early.
DMAs work on a broader scale, measuring water entering groups of properties and comparing it against expected usage. If a particular area shows excess consumption, Thames Water engineers investigate to locate the source, narrowing it down to specific supply lines.
While these systems identify where a leak exists, they cannot determine the exact location on your property. That’s where professional leak detection specialists, like Harmuns, are essential. Using advanced equipment, we can locate leaks quickly and without unnecessary disruption to your home or business.
Common signs of a hidden leak in your home or business
Even if the leak isn’t visible, there are often subtle indicators that something is wrong. One of the most obvious is an unexplained increase in your water bill, which can rise dramatically if water is escaping unnoticed. Another sign is the sound of water running when taps and appliances are off.
Other warning signals include damp patches appearing on walls, ceilings, or floors, and a gradual drop in water pressure. Warm areas on floors can indicate a leaking heating pipe beneath. Outdoors, consistently damp patches or unusually lush grass can point to supply pipe leaks buried underground.
Businesses may notice performance issues with water-using equipment, higher maintenance costs, or complaints from staff about damp or uncomfortable working conditions. Catching these early prevents escalation, saving time, money, and stress.
However, sometimes there are no clues that there is a leak underground, other than the notification from Thames Water and so contacting a specialist non-invasive leak detection company, such as Harmuns is a sensible first option.
Risks of ignoring a leak you’re responsible for
Delaying action on a leak can be extremely costly. Even a small leak underground can waste thousands of litres a month, inflating bills and putting unnecessary strain on local water resources. Ofwat estimates that around 3 billion litres of treated water are lost daily in England and Wales, enough to fill over 1,200 Olympic swimming pools.
Ignoring a leak can also cause serious structural damage. Prolonged moisture weakens building materials, rots timber, corrodes pipes, and promotes mould growth. According to WaterSafe, untreated leaks are one of the most common causes of internal damp and long-term property damage.
For businesses, delays can carry additional risks, including higher insurance premiums or difficulties with claims if damage escalates. Homeowners and business owners alike benefit from acting as soon as a leak is identified.
How professional leak detection engineers locate hidden leaks
Tracing hidden leaks requires specialist skills and equipment. At Harmuns, our engineers are WIAPS-approved (Water Industry Approved Plumbers Scheme) and Gas Safe registered. This ensures work is carried out safely, accurately, and to the highest industry standards.
We use a range of non-invasive detection technology: thermal imaging cameras reveal warm water leaks behind floors and walls, acoustic detectors listen for escaping water, and moisture meters locate hidden damp. Tracer gas testing can track leaks in buried pipes without digging, and endoscope cameras allow inspection inside pipes.
These techniques allow precise identification of leaks, usually within a single visit. Our engineers carry all this equipment with them, meaning they can locate the source quickly and advise on the next steps, reducing disruption and stress for property owners.
Preventing future leaks and protecting your property
After repairing a leak, preventing further problems is essential. Older pipes, particularly lead or steel, are more prone to leaks, so replacing them with modern materials reduces the risk of recurrence.
Regularly checking your water meter when no water is being used is a simple, effective preventative measure. Insulating external pipes against cold weather and scheduling routine plumbing inspections can also help. Acting quickly at the first signs of damp, mould, or unusual water usage protects both your property and your wallet.
How Harmuns can help
If Thames Water has notified you of a leak and it’s your responsibility, don’t panic – Harmuns are here to take the stress away. Hidden leaks are tricky to detect, but our team specialises in locating them quickly, cleanly, and with minimal disruption.
Our WIAPS-approved and Gas Safe registered engineers carry the latest detection equipment, including thermal cameras, tracer gas kits, pipe locators, drones, steam generators and endoscope cameras, ensuring accurate and fast identification. With a 5-star Google rating and top reviews on Trustpilot and Checkatrade, you can trust Harmuns to handle your leak professionally and efficiently. Save our number today – 01753 378569 – so you know exactly who to call if Thames Water flags a leak on your property.