FAQs • Blaine, MN • CivicEngage

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Public Works - Water Division - Hydrant Flushing FAQs

1. What is water system flushing?: Water system flushing (also known as hydrant flushing) is a routine maintenance process that involves the systematic flushing of the water distribution lines to remove sediment and improve water quality. When flushing, fire hydrants are opened, increasing the velocity of the water moving through the pipes. This process cleans the pipes and removes the sediments that can affect the taste and color of drinking water.

2. Why is flushing needed?: Flushing is a routine maintenance process that removes sediment and improves water quality. Without regular flushing, sediment can build up in the pipes and affect the quality, taste and color of drinking water.

3. Why is some flushing conducted in the fall?: Isolated areas of the city, especially on cul-de-sacs or small development areas, do not draw water through the system at high velocities. This lets any sediment in the water to precipitate out and settle on the bottom of the pipes. Fall flushing in these areas helps to remove the sediment and maintain higher quality of water in the system.

4. Where does the water go?: After the water is de-chlorinated, it is discharged into the storm drainage system.

5. How will my water service be affected?: The flushing process does not typically interrupt water service, but it can happen on occasion. A loss of water pressure is more common. Water also may appear cloudy or discolored for a short time.

6. What should I do if my water is cloudy and discolored after the flushing is completed?

Wait until the nearby flushing is completed, remove faucet aerators and filters and run cold water for 5-10 minutes. If water still is not clear, wait 30 minutes and try again. Running the water in a bathtub speeds up the cleaning process and provides a light background to help you monitor the discoloration. Another option is to run the garden hose, weather permitting, until the water clears. Though discolored, the water can be used on plants and landscape.

Cloudy: Water gets cloudy when air gets in and makes tiny bubbles. These bubbles are harmless and will disappear by letting the water sit for a few minutes.
Discolored: Sediments in the water lines get stirred up and may cause a slight water discoloration for a short time.

7. Can I use my water while crews are flushing in my neighborhood?: Please minimize water use while crews are in your neighborhood. To avoid the risk of drawing sediments into your hot water tank, do not use any hot water. Avoid doing laundry during this time as the sediments in the water may cause stains.

8. Is my water safe to drink?: Yes. The sediments that get stirred up may not be aesthetically pleasing and can cause the water to discolor and stain laundry, but they are not harmful.

9. What should I do if the water stains my laundry?: Before drying, rewash the clothes when both the cold and hot water are clear. Non-chlorine bleach (such as Clorox II) may be used to help remove the stains. Do not use chlorine bleach.

10. Are there other benefits to water system flushing?: Flushing is an essential preventative maintenance strategy for the water system and also provides an opportunity to inspect the fire hydrants for operation and safety.