Mark Collins, from West Bay Coastguard, said: "Anyone going that close to the edge is risking themselves, anyone below them, and us, if we have to go and rescue them.
"There have been several accidents there. People don't realise they are standing on turf with nothing below."
As well as triggering a tourism boom, the crime drama, starring David Tennant and Olivia Colman, is affecting property prices in the West Bay and Bridport areas.
The 100-year-old chalet in West Bay used in the series as the home of Detective Inspector Alec Hardy (Tennant) is for sale at 275,000 ($536,000).
Estate agent Malcolm Gill said the "Broadchurch effect" added about 50,000 to the price.
-Daily Mail