All of Fuller's pubs will become stations for people to fill up their empty water bottles for free.
The London based pubco and brewery has registered all of its 397 pubs – managed and tenanted – with the Refill campaign app.
The campaign was started by Bristol company City to Sea three years ago to make refilling water bottles as convenient as possible and prevent plastic bottles being thrown away.
Jonathon Swaine, managing director of Fuller's Inns, said: "This is a fantastic initiative and a great cause. I am thrilled that we are the first pub company to be working with the team at Refill and I am keen to help them spread the word of this campaign. It is proving popular in our pubs, with our teams welcoming new customers and giving them another reason to visit a Fuller's pub."
The news comes on the same day that the government has announced plans to introduce a bottle deposit scheme. Shoppers will get the deposit back if they return glass and plastic bottles and aluminium cans.
Around 13 billion plastic drinks bottles are used in the UK every year but 3 billion of these are not recycled.