Whether or not your water company help find and fix a mails supply leak will depend on the location of the leak and the individual water company. However, generally if a leak is on your land it is more likely to be your responsibility to resolve the issue. That said, if you have the right cover on your home insurance policy, they may pay for this work and any damage that is caused. We provide a full leak detection service to insurance companies in the UK, who trust us to do it.