Canatara Beach will fly the Blue Flag again this summer, for the fifth year in a row.
Grand Bend Beach, Grand Bend Marina and Port Franks Marina in Lambton Shores also made the list again this year.
Tourism Sarnia-Lambton spokesperson Kyle Morrison says the Blue Flag status has led to an increase in the number of visitors.
"It's really a marker that this beach is clean, it meets a certain set of safety criteria and there's also amenities that it offers as well," says Morrison. "We've definitely noticed a huge uptick in people that are aware of the designation and who are looking to visit those beaches."
The Blue Flag recognizes beaches and marinas that have achieved international standards in water quality, environmental management, environmental education and safety and services.
There is a record 27 Canadian beaches and nine marinas on the list this year.