Village leaders in Woodlawn say they still aren’t sure what is causing chlorine levels in the drinking water there to be so low. Residents of Woodlawn have been under a boil water order for nearly three weeks.

The water comes from Mount Vernon, which gets it from the Rend Lake Conservancy District, but other locations are not having the same problem. Village leaders in Woodlawn say they are working with the EPA to find a solution.