Devon and Somerset Fire and Rescue Service urged drivers to avoid flooded roads as it declared the major incident on Tuesday night as heavy thunderstorms lashed the country.
The statement read: “A Major Incident has been declared regarding flooding in the Galhampton, North Cadbury, and South Cadbury Areas. Devon and Somerset Fire and Rescue have several resources deployed to the area to deal with the situation.
“Please avoid driving through floodwater. If you come into contact with floodwater, please take the necessary steps to decontaminate yourself and clothing appropriately. Should you find yourself in an emergency situation involving floodwater, please ring 999. “
A police spokesman said: “Houses have been evacuated in North Cadbury, Queen Camel and surrounding villages. Roads have been blocked by mudslides and drivers are advised to avoid flooded areas.”
More than 20 flood warnings are currently in place across the South West.
Alerts were issued for areas around River Clyst and Clume, River Tone, East Somerset Rivers, River Cam, South East Somerset Rivers, River Cale, Mid Bristol Avon area, Upper Bristol Avon area and rivers in the Forest of Dean.