There’s a warning from the city about coming into contact with the water at Pier 4 Beach.
The warning is posted to the city’s beach water quality webpage and follows the discovery of toxic blue-green algae at the Hamilton Harbour hot spot.
There are no safe beaches for swimming on Hamilton Harbour as a result of the closure, since Bayfront Beach is permanently closed due to a history of poor water quality.
Blue-green algae produces toxins that are harmful to both people and pets, if ingested, and coming into contact with it can have a range of health impacts.
Hamilton Public Health notes that contact with the algae, depending on the length of exposure, can cause everything from skin irritation, rashes and itching to fever, diarrhea, nausea and vomiting.
All of the city’s other beaches are currently listed as safe for swimming.
That includes all sections of beach along Lake Ontario, from the Burlington lift bridge to Confederation Park and the beach areas at Valens, Christie and Binbrook conservation areas.