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Water Main Flushing
To protect the City's water supply, all Cottage Grove water mains will be flushed in the spring and fall. Public Works Department employees flush the water mains by opening each of the 1000-plus fire hydrants in Cottage Grove. The sudden rush of water loosens and removes accumulated mineral deposits from the lines.
This process often causes discoloration of your water in the home. The water is safe to drink, but it may stain fabrics if you are washing clothes at the time the water main is being flushed. Check for signs of discoloration before using the water to wash clothes.
The Public Works Department suggests that each homeowner flush out the taps in their home at the same time water main flushing is done, since iron deposits tend to also build up in residential lines. When weather permits and all the hydrants have been flushed in your neighborhood, open the outside faucets and run all the cold water taps in your home at full force. The water will start out clear and then become discolored. Leave the taps open until the water becomes clear again, usually in 10 to 30 minutes.
If you have any questions about the flushing process, please call Public Works at 651-458-2808.
Fall water main flushing will begin on the week of September 8th. Crews will begin in Zone 1 (light green) and end in Zone 4 (pink, west side of Highway 61). See the map and chart below for more detail.
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| Zone 2 (Yellow) |
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| Zone 3 (Purple) |
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| Zone 4 (Pink) |
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City Gov't