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Posted on: June 2, 2022


Discoloration can occur in a water system when significant increases in flow through the water mains stirs up the natural minerals that have settled during periods of lower flow.   This persists until the sediment is flushed out of the system.


So, what causes an increase in the flow of water in the lines?


This is a common occurrence in the summer months when the temperature rises and water consumption increases.  Our customers use on average 1.2 million gallons of water each day.  However, during the sweltering days of summer, that number rises as high as 4.5 million gallons a day.


When there is that much water being pumped through the water mains, the velocity can stir up mineral scale that has settled in the pipe and ultimately come out of your tap.


While the color is not aesthetically pleasing, the water is safe.  However, it is prudent to flush the discolored water as much as possible before drinking it.


You will want to avoid using hot water while you see discoloration to keep from pulling water into your water heater.  Also, some of the minerals from discolored water may stain clothing, so it’s best to postpone washing light colored laundry.




Pat Fawver

Utility Director

City of McCook

PO Box 1059; 505 W C St

McCook, Nebraska 69001

(308) 345-2022, ext. 223

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