Three fire crews from Cheddar and Bridgwater were sent to the incident at 9.20am in the village of Tarnock.
The animal was retrieved unhurt, but shaken, following a 30-minute operation.
Firefighter Bob Salway said: “After 33 years in the fire service, that’s the first alpaca we’ve retrieved from a water-filled ditch.”
Owner Carolyn Allen said she had not had the alpaca for long and would be putting up a fence to stop the animal getting stuck again.
Pictured above is the alpaca being rescued by fire crews near Burnham on Wednesday morning (Pic: BBC)