Many Canadian cities are falling short of testing drinking water for all possible harmful contaminants, and experts say the long-term consequences could be detrimental to people’s health, a CBC News investigation has found.

CBC asked 18 cities in every province and territory to provide a list of the health-related contaminants they test in their water supplies. Only one — Ottawa — tests for all 75 substances found in Health Canada’s published guidelines for Canadian drinking water.

Some cities, like Calgary, Edmonton and Halifax, test for all but one of the substances in the guidelines. Quebec City tests for 62, Regina 52, Winnipeg 49, St.John’s 26 and Iqaluit just tests for 20… more