As a water utility, I would say I probably have a philosophical difference with that. The problem with filters is that they have to be maintained by homeowners in the long term. Water utilities and municipalities are not really equipped to maintain filter systems within buildings. There are all sorts of different filters that do all sorts of different things at all sorts of different costs and prices to maintain. Doing that would become fairly complex. I'm not sure in the long term that would be successful.
From a water utility point of view, we would like to be able to provide water up to the service connection and up to the tap that is safe to drink, which includes being, as Dr. Prévost noted, not too corrosive. We haven't talked a lot about corrosion control today. Another approach a utility can use is to adjust their water chemistry to make the water the least corrosive possible.
I didn't mention it yet but we are looking at the addition of phosphate in Edmonton to further reduce lead levels all around in combination with aggressive lead service line replacement. That's the strategy we would tend to use. Then hopefully you're just left with a few hot spots here and there that might be dealt within the buildings themselves.