Epcor began adding orthophosphate at its two local water treatment plants last week, two years later than initially planned, the utility confirmed with Postmedia. This treatment will create protective coatings inside pipes to prevent lead from leaching into drinking water, both for Epcor’s pipes and those of private property owners, in hopes of making sure lead concentration in water citywide meets Health Canada’s standards. It’s expected to take up to six months to take full effect.