Trump gave them $100 million to fix it, last year.
https://www.epa.gov/newsreleases/epa-awards-100-million-michigan-flint-water-infrastructure-upgrades
and michigan is working on it
https://www.detroitnews.com/story/news/michigan/flint-water-crisis/2018/12/04/state-shrugs-flint-pipe-replacement-work-ahead/2204132002/