Water infrastructure – that is, water mains, sewer systems and treatment plants – are usually out of sight and out of mind. That is, until something goes wrong. Calgary and Montreal experienced substantial water main failures this year. In Ontario, Hamilton has redoubled it efforts to evaluate and improve its very old, very complex system to prevent more sewage spills. And there are many more examples of systems in the province that need upgrades or expansions. And what does all of this have to do with aggressive housing targets Ontario has introduced?