It is almost impossible to be against a rule announced by the Environmental Protection Agency this month requiring utilities to replace all lead pipes within a decade. After all, who opposes the swift removal of a deadly toxin from drinking water? But there’s a tricky road ahead, and it’s an expensive one to travel.

The 9 million or so service lines across the United States pumping poison through our homes and into our bodies cause all manner of maladies, such as high blood pressure, kidney malfunction, cognitive disability and hyperactivity. The EPA estimates that, in a country without lead pipes, 1,500 fewer people every year would die early of heart disease and about 900,000 fewer infants would suffer from low birth weight. The shift could even prevent 200,000 lost IQ points in children annually.