A leak on an incoming mains water pipe can be a serious issue. The leak is often hidden deep underground or within the property’s floor or walls, making it difficult to detect without the proper equipment and expertise. If left unchecked, a mains water leak can lead to extensive water damage to the property, or even structural damage if soil and granular material is washed away causing subsidence. Mains water leaks also waste a lot of water with consequent high water bills and negative environmental impact.

At The Leak Detection Company, we specialise in providing an accurate and efficient mains water leak detection service for both domestic and commercial properties. This covers both the incoming mains water supply (usually external) and the internal cold supply. Our team uses the latest hi-tech electronic technology to non-invasively (no damage) locate leaks in your mains water quickly and accurately, whether it’s affecting your home or business. Where possible, our engineer will offer to excavate and expose the leak on the same day, then re-test afterwards to ensure everything is watertight. This repair service is not possible if the leak is under hard standing or any other surface or obstacle which requires specialist contractors.

Why Choose Our Mains Water Leak Detection Service?

✅ Over 17 Years of Experience detecting and repairing mains water leaks

We’re a trusted, family-run leak detection company with a proven track record and over 1,000 five-star reviews.

✅ High-Tech, Non-Destructive Leak Detection

We use the latest technology—thermal imaging, acoustic microphones, tracer gas, dye tracing, endoscopic cameras, and moisture mapping—to find hidden leaks without the need for destructive investigation.

✅ Fully Qualified Engineers

Our in-house team are fully trained, DBS-checked plumbing professionals with specialist equipment to detect and repair mains water leaks fast.

✅ Fast Same-Day Repairs

We can often locate, expose, and repair mains water leaks the same day—reducing disruption and repair costs.

✅  Transparent, Competitive Pricing

No hidden charges. Our leak detection services are cost-effective, and many customers successfully claim the cost back through their home insurance ‘trace and access’ cover.

✅  Insurance-Approved Reports

We provide a comprehensive report (with photos) to support insurance claims under ‘escape of water’ or ‘trace and access’. Reports are emailed within 24 hours.

Signs That You Might Have a Mains Water Leak

• Unexplained water bill increase: If your water consumption seems unusually high, you might have a hidden leak somewhere along your Mains Water pipework.
• Your Water Supplier has issued you with a Section 75 notice: under the Water Industry Act 1991. This is a formal notification from a water supplier to a customer regarding a suspected leak in their property’s water supply. This notice obliges the property owner or occupier to take steps to repair the leak within a specific timeframe, usually 7 to 14 days.
• Water consumption test: using the water meter a basic check can be completed to ascertain the likelihood of a leak. First ensure no water is being used by turning off all appliances and fixtures. Next, locate the water meter and take a reading, noting all numbers and dials. Wait for a period (30 minutes to one hour) and take a second reading. If the readings are the same, there’s likely no leak. If the readings differ, you may have a leak and further investigation is needed.
• The ‘flow’ on your external water meter constantly spins despite no known water consumption.
• Low water pressure: A drop in water pressure throughout your property could signal a leak in the mains supply.
• Pooling water: Water gathering in your driveway, garden (including any new boggy or lush areas) or floor, could be from a water mains leak.
• Water tanks constantly filling or quickly emptying.
• Damp or water damage: This may be evident on floors, walls or ceilings, including mould, warped floor finishes, blown plaster, salt damage and condensation. If the problem is relatively new and has worsened over a short period of time, this is a good indication of a possible mains water leak.
• Hissing, knocking or bubbling sounds: If you hear the constant sound of water running, this could indicate a leak in the mains water, especially if the noise stops when the stopcock is turned off.
• Constant drip or flow of water visible: if the leak is not intermittent, and/or stops when the stopcock is turned off, this usually indicates it could be a mains water leak.
• Higher than expected consumption of water softener salt

📞 Contact our friendly and knowledgeable team today to see how we can help with your mains water leak.