Flood protection has been beefed up at a pumping station after its high voltage transformers were nearly engulfed.
Extreme flooding at Leatherhead Pumping Station threatened the water supply for thousands of homes on Christmas Eve.
Sutton and East Surrey Water (SESW) employees are now working around the clock with the emergency services to protect Kenley water treatment works, which supplies water to more than 46,000 properties.
In relation to Leatherhead Pumping Station, a SESW spokesman said: "We have improved the flood protection around the high voltage equipment at the pumping station and we are fully satisfied that it is well protected.
"The water levels are not reaching the levels we saw at Christmas Eve when we had a major incident. We have put barriers up and sandbags and various other kit to raise the protection level."