Fall System Flushing. The Middleton Water Utility will be flushing mains and hydrants throughout the City during the weeks of Sept. 13-17 and Sept. 20-24, between the hours of 7:00 pm – 5:00 am. A slight discoloration of the water may be noticed during this maintenance. If you notice a rusty discoloration in the water, running it for a few minutes from a lower level faucet helps clear it up. Your cooperation and indulgence is appreciated. Thank you.