The Toronto half of this site is now (happily) a research archive, and is not being actively maintained since the City published what I consider to be adequate information about public washrooms. You can find the City’s official Summer washroom list here: https://www.toronto.ca/explore-enjoy/recreation/spring-summer-washrooms-in-parks-recreation-facilities/
The Hamilton side is still in progress, as no such list from the City has been made there. Stay tuned for more updates!
If you prefer, you can download an Excel spreadsheet of the Summer washrooms here/Si vous préférez, vous pouvez downloader une liste Excel des toilettes disponibles l’été ici: