Public Works

Hydrant Flushing

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​​​Current flushing​

(updated April 7, 2022)​

The City of Ann Arbor's annual fire hydrant flushing will resume on Monday,  April 12,  2022. This flushing will continue until all hydrants in the City are serviced.​ 

graphical map is updated only during annual spring hydrant flushing to show which areas of the city are having their hydrants flushed. ​Public works staff flushing a hydrant in Ann Arbor.jpg

When is flushing performed?

The City of Ann Arbor conducts annual fire hydrant flushing beginning every spring and continuing on a weekly basis through the fall.

Why is flushing done?

This annual maintenance is done to remove minerals and sediment that accumulate in the water lines over the course of a year.  This preventative maintenance also allows us to check and record water pressure to ensure the water system is functioning properly.

What to expect ​

​During this process, you may observe a fire hydrant with water coming out of the side opening.

On occasion, during spring hydrant flushing,​ the water in the areas of flushing may temporarily have an reddish/orange rusty appearance. The hydrant flushing can disturb iron sediment in the water pipes and cause the discoloration. The water is safe to drink. If this occurs, please run your cold water at the tap closest to your water meter for several minutes to clear your lines. You should also flush your toilets once or twice. The water should run clear within a few minutes but may last until the evening when hydrant flushing stops and more people are home to move the rusty water out of the system. 

​Please don't run warm water, as this forces the discolored water into the water heater, mixing it with clear stored water. If you do get rusty water in your hot water heater, drain the hot water heater per the manufacturer's instructions. If your laundry becomes discolored from the use of rusty water, products like “Rover" can help remove temporary laundry coloration. 

If you have any questions or concerns regarding hydrant flushing, please call the city at 734.794.6320.

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