A report from the Michigan Department of Environmental Quality obtained by FOX 17 through the Freedom of Information Act shows approximately 29 percent of water produced by the Muskegon Heights filtration plant is 'unaccounted' for in the city's system. In the past several months FOX 17 has been investigating claims made by several dozen residents living in Muskegon Heights who say they've received unusually high water bills from the city, with some bills in the thousands of dollars.