City of Corunna issued the following announcement on Sept 22.
Fire Hydrant Flushing will be as follows:
Ward 1 - October 12, 2021
Ward 2 - October 13, 2021
Ward 3 -October 14, 2021
The hours of flushing will be from 9:00 a.m. to 2:00 p.m. each day. You should not plan to do any laundry for those days as you may see colored water for all three days. It will clear up after the flushing is done. (Please be aware that the water lines are connected together and you could get colored water even if we are not flushing in your area.)
Original source can be found here.