The most important thing to understand is that the most pervasive and certain cause of illness from drinking water has nothing to do with industrial discharges; it's human waste, animal waste, wildlife. That's the source of microbial pathogens, and that's the thing that most commonly makes people ill from drinking water. That's what killed people in Walkerton. That's what made people sick in North Battleford.
Industrial contamination is very site specific. Obviously, there are circumstances in Canada where communities are located near industrial activities, and they may experience difficulties from industrial contamination. In my experience over the past 40 years, these cases are actually few and far between. They're not the dominant problem that we're trying to resolve.