City of Marshall issued the following announcement on May 8.
Residents might see some discoloration in their water next week as city water operators begin their annual hydrant flushing and maintenance program May 11 - 15.
Crews will be checking all hydrants in the area. Customers may experience less water pressure or discolored water. Just run cold water for a few minutes and the color should clear up.
Original source can be found here.
Source: City of Marshall