We have noticed that the retention time of copper in the pipes of residences that are a long way from the street is much longer. So we have to increase the pH of the solutions. Adding an anti-corrosion treatment and increasing the pH makes the water less aggressive. So we can solve some of the problems that way.
The places where we found copper were in water pipes serving houses further away. So the copper level was higher on the private side. The pipes belonging to the city of Trois-Rivières do not have that problem. Only the residents really noticed it. We came to an agreement whereby they would agree to change a part of their water line. Not a lot of people lived in the residences in question and the copper stayed in the lines for a long time before the water got to them. It is also a problem for people who live a long way from the street or from the municipal system.