As of Sept. 6 at 12 p.m., the water at five Toronto public beaches - Marie Curtis Park, Sunnyside, Cherry, Woodbine, and Kew-Balmy - is not safe for swimming due to high levels of E. coli bacteria. According to public health guidelines from the Ontario Ministry of Health and Long-Term Care, water is considered unsafe when one sample contains 400 or more E. coli bacteria per 100 milliliters, or the geometric mean of five samples is 200 or more**. Consuming E. coli can cause serious illness, including stomach cramps, diarrhea, and vomiting, as well as other infections such as skin rashes and eye, ear, nose, and throat infections. It's also possible that other harmful organisms are present in the water due to high levels of E. coli. The latest available data may not reflect current conditions at the beach because collecting, transporting, and testing beach water for E. coli can take a day or more.
| Signal | Value | Weight |
|---|---|---|
| Correction rate | 0.003 | 0.4 |
| Uncertainty density | 0.048 | 0.25 |
| Assertive mismatch rate | 1.000 | 0.35 |