In Boston, Lincolnshire, more than 250 people were taken to evacuation centres last night, and 200 were reported to be at a centre in Clacton-on-Sea in Essex.
Residents have now been told they can return home, but must check with police before entering their homes due to gas and electricity safety concerns.
Some parts of the UK are have seen the worst storm surge in 60 years, but we are not out of the danger yet.
A combination of factors are combining to make this storm surge particularly powerful.
Water levels around the UK could be higher than in the storm surge of 1953, but thanks to flood defences the impact is likely to be smaller.