Halifax Water is considering an expensive proposal to speed up the replacement of its customers’ underground lead pipes in the wake of a groundbreaking investigation, exposing widespread risk of contaminated tap water in hundreds of thousands of homes in Nova Scotia and across Canada. The utility board will review a report during a meeting on Thursday that cites the Tainted Water series as an impetus for the recommended course of action. The new plan would cost $14 million, but save money in the long run, the report said.