It's affecting up to 1,500 homes and businesses there.
Engineers from local gas distribution company Cadent are working to restore gas supplies to homes in Wirksworth, Derbyshire, where a large amount of water has entered the local gas mains network.
The company said: "We believe this is affecting gas supplies to some 1500 homes and businesses in the town.
"There is a burst water main in the area and we are liaising closely with Severn Trent Water. We have stopped water entering the gas network and work is under way to repair the burst water main.
"Before we can restore gas supplies we will need to remove all the water from our pipes. Our engineers also have to visit every property affected to safely turn off the gas supply at the gas meter. Please arrange for someone to be at home or make arrangements to enable us to access your property.
"Please do not turn off your own gas supply unless you are advised to do so by Cadent. Otherwise wait for an engineer to call.
"All our engineers carry identification. Please ask to see it before allowing anyone into your home.
"Once every home is switched off and all the water has been removed from our gas pipe network, we will then have to visit every property to switch the gas supply back on and ensure gas is flowing safely.
"We expect the operation to restore supplies will take a number of days.
"We are liaising with Derbyshire County Council to identify those residents who are most vulnerable. If you or your neighbour need assistance and are elderly, chronically sick, have very young children, are recovering from a hospital stay, have a terminal illness, have a disability or are registered on the Priority Services Register - https://cadentgas.com/about-
"A customer centre has been set up at Wirksworth Town Hall, Coldwell Street, Wirksworth, DE4 4EU, if people need information or assistance.
"If you are in Wirksworth and you have lost your gas supply or have query about this incident please call 0345 835 1111.
"If you smell gas please all the national gas emergency service on 0800 111 999*.
*all calls are recorded and maybe monitored."
The company confirmed the burst water main had been fixed just after 1pm.