Marston's has vowed that beer deliveries won't be affected despite the flooding at its Jennings Brewery in Cockermouth.
Severe floods hit both Cockermouth and Keswick last night and police said that water levels in Cockermouth centre had reached more than 2.5m.
Marston's Beer Company boss Stephen Oliver said some water had got in to the brewery, which is situated between the two towns and on the River Cocker.
"There is some water there but as far as customers are concerned, we should be able to continue to deliver beer as there is plenty of stock within the system.
"The problem is the access road is under water so staff are wading through on foot to assess the damage.
"It is changing every minute and obviously a lot of the roads around are also flooded.
"We don't know the full extent of the flooding yet, but as I said, there is stock in the system so beer supply and deliveries should not be affected."
Around 200 people were airlifted during the night, including several regulars from the roof of the Black Bull pub.
John Carlin, owner of the Allerdale Court Hotel, told the BBC the amount of rainfall was "staggering".
"I have lived here for 15 years and have never seen anything like it," he said.
"At two o'clock it was raining heavily, but there was nothing here. But now there is four feet of water outside my front door.
"It's desperate. The town centre is completely flooded, the only people out there at the moment are the emergency services. The water is up to the waists of the firefighters."
There are 10 severe weather warnings in place across Britain.
• Check the flood warnings in your are by visiting the Environment Agency website.
• Is your pub in Cockermouth of Keswick or any other are affected by flooding? If so, let us know by email Ewan.Turney@william-reed.co.uk, ring 01293 610 388 or hit Post a comment below. Please include contact details.