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Swim Drink Fish Canada

Great Lakes Community Monitoring Program- Toronto Hub

592 Observations
0 Issues
17 Locations


Justin Langille
350 Points
Elise Mackie
70 Points
Cat Scott
30 Points
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We are an organisation called Swim Drink Fish Canada. We support people who restore swimmable, drinkable, fishable water in Canada and around the world. Our teammates are the creators and leaders of Lake Ontario Waterkeeper, Swim Guide, and the Watermark Project. These programs have over 1 million users. We work with other organisations and individuals to help restore water that you can swim in, drink from, and fish from.

Toronto, like many cities across Canada, has a combined sewer system. Combined sewers are designed to collect stormwater runoff and wastewater in the same pipe. All that combined water usually flows to a wastewater plant for treatment. Untreated sewage spills into the lake from combined sewer overflows (CSOs). They are the largest source of water pollution in Toronto.

The usual culprit is rain. Whenever it rains in Toronto, sewage flows into Lake Ontario. Every time. In 2015 alone, CSOs spilled 3.7-million cubic metres of raw sewage into Toronto waters.

The Toronto hub was the first and is now one of five monitoring hubs created by Swim Drink Fish. 2021 is the sixth year of sampling at the Inner Harbour sites. Staff along with a group of trained citizen scientists sample the water every Tuesday and Thursday. We sample four main locations in the Inner Harbour: Marina 4, Rees St. Slip, Ontario Place West Island Beach and Bathurst Quay. Each of these locations has a CSO pipe flowing into it.

In 2018 two teams of dedicated, trained citizen scientists started monitoring Humber Bay West Park in Etobicoke, and Algonquin Bridge and Snake Island on Wards Island. In 2020, First Street Beach was added as a sampling site.

Beginning in 2018, this project has been undertaken with financial support of the Government of Canada through the federal Department of Environment and Climate Change.

Water testing protocol

We test primarily for the presence of E. coli. with the use of the IDEXX system. We also take water temperature, and depth of clarity. At specific sampling sites we also measure dissolved oxygen, and pH, Alkalinity, Hardness, and Chlorine, as well as conductivity.

Areas monitored

600 Bay Street
Toronto, Ontario