Yes, there is concern about the water quality in our area of Lake Superior https://www.ec.gc.ca/raps-pas/defaul...n&n=C111B1AD-1 . That of course is prior to water treatment for domestic use by the city.
This is an older report but I see no reason that there would be a huge deterioration between then and now http://www.thunderbay.ca/Assets/Livi...ual+Report.pdf . At that time no mercury was detected in the drinking water post treatment and of the 38 pesticides and 18 industrial chemicals tested for none were present either. Water hardness ranged between 46-49 mg/L so well into the soft range.
Thanks for the push to check that out.
Bob