A major water leak in your house can be very dangerous and damaging. The first thing you should do is turn off the main water supply to your house. This will stop the water from flowing and prevent further damage. This is an emergency situation, so you should call our plumbers as soon as possible to help you fix the leak. Please be careful; and do not touch any electrical fittings that are wet! You may also need to call an electrician to advise you.