How to Fix a Burst Water Main

A burst water main can be a nightmarish situation if you don’t know what to do. In this blog post, we help you to understand the types of water mains, identify the signs of a burst and know when to attempt a DIY fix versus calling a professional. Remember, acting quickly can save you from further damage and expense.

Understanding the Types of Water Mains

The water pipes in our homes are often hidden in unexpected places, and it's surprisingly easy to accidentally cut through a water main. But don’t worry if you find yourself in this situation – most of the time, pipes can be fixed with a bit of DIY, and calling a plumber isn't always necessary. Let’s start by understanding the different types of water mains you might encounter.

Trunk Mains

Trunk mains are the largest type of water pipes, responsible for moving water across a whole region. Due to their large diameter, they play a crucial role in water distribution.

Distribution Mains

Smaller than trunk mains, distribution mains transport water around local areas. These pipes are commonly found in residential neighbourhoods or housing estates. 

Communication or Supply Pipes

These pipes deliver water directly to individual properties. They branch off from either trunk mains or distribution mains, ensuring that homes receive their water supply. 

In the UK, a burst supply pipe is typically the responsibility of the property owner if the damage occurs on the property side of the boundary, usually after the water meter. Specifically, the property owner is responsible for the maintenance and repair of the supply pipe from the property boundary to the point where it enters the home. The water company is responsible for the pipes leading up to the property boundary.

Identifying a Burst Water Main

It can be challenging to determine if your water main has burst. However, by paying close attention to your water supply, you may notice several tell-tale signs.

Changes in Water Flow and Pressure

A complete shutoff of water, a decrease in pressure, or a reduced flow from your taps can indicate a burst water main.

Flooding

One of the most obvious signs of a burst water main is flooding. Puddles of water on the floor can signify a significant leak.

Mould

An increase in dampness and moisture often leads to mould growth. If you notice more mould than usual, it could be related to a burst main.

Water Meter Activity

A rapidly spinning water meter is a strong indication that water is escaping somewhere, possibly due to a burst main.

Bubbling Walls

Bubbling walls, peeled wallpaper, or uneven paintwork can be subtle indicators of a burst pipe hidden behind the walls.

Patches of Extra Healthy Grass

Outside your home, unusually green and healthy patches of grass can point to a burst main underground, as leaking water nourishes the area.

Who is responsible for repairing a burst water main?

If you experience a burst pipe, it’s important to determine the exact location of the burst to understand who is responsible for the repair. Always consult with your local water company if you are unsure, as they can provide guidance based on the specific layout and agreements in your area.

Here are some key points to clarify responsibility:

Property Boundary

The property owner is responsible for any pipes that are within their property boundary. This includes the supply pipe that runs from the boundary into the home, typically after the water meter if one is installed at the boundary.

Shared Supply Pipes

If a supply pipe serves multiple properties (e.g., in the case of terraced houses), the responsibility might be shared among the property owners. However, individual supply pipes that branch off to serve a single property are usually the sole responsibility of that property owner.

Before the Meter

Any issues with the water mains and pipes before the meter, typically outside the property boundary, are the responsibility of the water company. This includes the main distribution pipes in the street.

Meter Location

If the meter is located outside the property boundary, the responsibility of the property owner starts from the point where the pipe enters the property. If the meter is inside the property, the responsibility typically starts from the point where the supply pipe crosses the boundary.

Fixing a Burst Water Main

Fixing a burst water main can range from a simple DIY task to requiring professional intervention. Here’s what you should do if you detect a burst main in or around your property.

1. Turn Off the Water

The first and most crucial step is to turn off the water supply. Locate your home's stopcock and shut it off to prevent further water flow through the damaged area. This will make inspection and repair much easier.

1. Access the Damaged Pipe

To inspect and repair the burst pipe, you need to access it. This might involve removing drywall with a drill or drywall saw or taking up floorboards. Be cautious when using a drill to avoid causing further damage.

1. Inspect the Damage

Once you’ve accessed the pipe, assess the extent of the damage. A small pinhole leak is much easier to fix than a long, deep cut. The pipe’s material and size will also affect the repair process.

1. DIY or Professional Repair?

If the damage is minor, a DIY repair might be sufficient. All-in-one pipe repair kits have made it easier to fix leaks. These kits typically include epoxy putty or pipe repair tape and a pipe repair bandage, allowing you to seal the leak within 30 minutes.

DIY repairs are often cheaper than professional services, but ensure the repair is thorough to prevent future issues.

For extensive damage to the pipe or surrounding structure, it’s best to call a professional. Ensure you hire a reputable plumber or tradesperson and check their credentials. Expect to pay between £40-£60 per hour for professional services, and be prepared for this cost.

An insurance company is also more likely to reimburse your costs if the repair is done professionally rather than a DIY job.

We hope you have found this information interesting and helpful. If you have any further questions you are always welcome to call our friendly team of experts on 01420 555600 or email [email protected]. 

Also, look out for more articles in our ongoing series of blog posts, bringing you useful information, insights, guides and tips on all things drainage!