the water out of the flint river didn't necessarily have the lead in it.as a corrosive chemical. when the water ran through these household pipes, it ate away at the landing right there, therefore exposing the household water to lead. once the leaching of the lead starts, you can't stop it. crews are at work, but three years into the problem, less than 25% of the lead pipes have been replaced. posing as water flows into most houses. >> i'm confused as to why health hasn't forward into the city to replace everybody's pipes. >> brigadier general michael mcdaniel was appointed to oversee the replacement in february of 2016. >> there was no project at that point. nothing had been done. >> people in flint believe recovery is slow because they are poor. >> i think a lot of the issues we deal with at the state and federal levels will be different if you are interacting with people who had influence. >> 12 people died of legionnaires' disease after bacteria festered in stagnant pipes during the 15 state and city officials facing criminal charges ranging up to invo