I have been associated with the CCME water work for approximately the last 13 years. The knowledge I have about when it started is that it would have been around 1987, I believe, in the first round of what we call the CCME binders, the two-volume binders that were printed and sold certainly across Canada but also around the world. I've been told, and I do believe, that those guidelines were used and valued around the world.
Each guideline in those binders is developed one at a time, over time. For example, we're currently developing a silver guideline, so that will be new. For example, an aluminum guideline was developed in the late 1980s.