As to lead in Flint Michigan's water system, boy, I'd love to see the City of Toronto look at the water supply here.
I can ASSURE you that there are tens of thousands, maybe hundreds of thousands of houses in Toronto with lead water services (i.e. the pipe that brings the water from the watermain in the street to your house).
If you live an older house in Toronto, i.e. one built in the late 1800's all the way to the 1940's, you could have a lead water service. (I know, I had one in my place and I made a point of having it replaced. The city paid for the new portion from the water main to the street line and I paid from the street line to the water meter. At the time, when I figured it out, I pointed it out to all my neighbours that we all had lead water services (we would get together for barbeques and laugh about the shitty water pressure (more accurately flow). Several of them poo-pooed me as Chicken Little and still have lead water services.) I have a nice new 3/4 inch copper K flex line connected to a lead free copper / pex system in my house.