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Water main flushing

updated: Friday, March 31, 2017

City crews are scheduled to flush the water mains throughout St. Louis Park to break loose normal mineral build-up inside underground mains starting Sunday, April 23, weather permitting. Hours of flushing will mainly be from 8 p.m. - 6 a.m. and should be complete by Friday, April 28.

Water main flushing is done to break loose normal mineral build-up inside underground mains. Crews flush the water mains by opening fire hydrants, so don’t be alarmed if you see water gushing from hydrants while a city truck is nearby.

Although the final result is improved water color and taste, this housekeeping procedure can temporarily discolor water due to the loose iron particles. Iron naturally occurs in groundwater and isn’t harmful to your health; however, rusty colored water can stain clothes during washing.

You may not experience any discolored water during this time period, but if you do, we recommend homeowners take the following precautions:

  • Turn your water softener off (or set it to “bypass”) for the time period.
  • During this time period, don’t do laundry without first checking to see if your water is rust-colored. You can check water by running the tap. If it’s rust-colored, don’t run your washing machine until you’ve cleared the water. To clear your water, simply run cold tap water in your laundry tub until it runs clear. Then you can go ahead and do the laundry.
  • Each morning during this time period, run the cold tap water to flush your household system of any discolored water sitting in the pipes. If tap water becomes discolored during the day, run the cold tap water until the water clears again.


If your laundry is stained by the water during this time period, keep the laundered items wet and call Public Works at 952.924.2562 to have a chemical brought to you that will remove the stains.

More Links

Public Works Administration
7305 Oxford Street
St. Louis Park, MN 55426
Phone: 952.924.2562 Email: info@stlouispark.org