Franklin Park Beach in Gravenhurst has been placed under a swimming advisory by the Simcoe Muskoka District Health Unit (SMDHU)
The levels of E. coli at the beach are above the provincial standard of 200 per 100 mL.
While there is a swim advisory in place, the beach is still open. However, officials with SMDHU warn anyone going for a dip risks developing minor skin, eye, ear, nose or throat infections or stomach illness.
Officials add to avoid dunking your head underwater or swallowing water.
The advisory was posted on July 22.
SMDHU officials posted similar warning signs on Jul. 21 at Muskoka Bay Park, also in Gravenhurst, as well as Port Sydney Beach in Huntsville, and Dwight Beach in Lake of Bays.