Following a water crisis that saw sky-high levels of lead contamination in Flint, Mich., many homes in the city still do not have access to safe tap water.

But that doesn’t mean they’re not being charged for it. And if they can’t pay in time, they may lose their homes.

The city has mailed 8,002 letters to residents in an effort to collect about $5.8 million in unpaid bills for water and sewer services. If homeowners do not pay by May 19, property liens are transferred to tax bills, which begins a process that can end with residents losing their homes unless they pay their outstanding bills before March 2018.

Flint generally sends these letters annually to property owners whose payments are at least six months late. But because Flint skipped this process in 2016, this year’s letters cover two years of past-due balances.