Multiple media outlets reported that Moncks Corner Police Chief Chad Caldwell would not identify the officer.
The pictures were made at a car wash Sunday at a tattoo studio. The studio's Facebook page said the women worked at a North Charleston nightclub.
Caldwell says he thinks the officer took his personal car to the car wash and then returned in his patrol car.
The chief says allowing bikini-clad women to be photographed next to a cruiser is a violation of department policies. He says it looks bad for the town.