As beaches officially open for the summer, Toronto Public Health is advising people to be cautious at a few city beaches. The warning comes on the heels of water quality notices for beaches at Centre Island, Woodbine and Kew-Balmy, which were also deemed unsafe over the weekend due to high levels of E. coli in the city's water quality testing. As Toronto is expecting rain on Monday, swimming should be avoided on Toronto beaches during and 48 hours after rainfall. Toronto Public Health's SwimSafe program monitors water quality at Toronto's 11 public beaches, testing daily throughout the summer months. The City of Toronto advises that beachgoers should not rely solely on lab results when deciding whether to swim at Toronto beaches.