Why are there more leaks when it's cold?
Leakage from our network increases in cold weather. When the temperature of the water going through our network drops due to freezing conditions, it makes the old cast-iron pipes contract. This pulls them away from their couplings with other pipes, resulting in millions of tiny gaps emerging through which water can escape.
In some cases, this flexing of the pipework leads to breaks along hairline weaknesses.
When the ground temperature drops below freezing we grit as many of our reported leaks as we can to try and keep everyone safe, but our message is to take care.