City of Oconomowoc issued the following announcement on September 14.
Fall Hydrant Flushing began 9/13 & is expected to go through 10/8. Flushing is done to maintain water quality and flow.
You may see some discoloration, but your water is safe to use. Call the Utility at 262-569-2196 with questions or concerns.
Original source can be found here.
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