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Residents in D.C., Fairfax County and Arlington County may notice changes in the taste, smell or appearance of their tap water as the region begins its annual water main cleaning Monday.
Chlorine will be added to disinfect the system and remove bacteria and natural biofilm buildup. Officials said the water will remain safe to drink, and any change in taste or odor should last no longer than a week.
D.C. Water said the Washington Aqueduct, operated by the U.S. Army Corps of Engineers, makes the annual disinfectant switch as part of routine maintenance to protect water quality.
Faucet and pitcher filters can reduce the chlorine taste and smell. Residents can also place an open container of water in the refrigerator for up to two hours, allowing the chlorine to dissipate before drinking.
Crews will briefly open fire hydrants throughout the three jurisdictions to move fresh water through the system. The work may stir up sediment or discolor tap water, but Fairfax Water said those effects are generally harmless and temporary.
Officials cautioned that discolored water could stain clothing even though it remains safe to drink.
In Arlington, flushing is scheduled from 9 a.m. to 3 p.m. on weekdays through May 4. Residents are encouraged to plan laundry around those hours.
Arlington residents whose clothing is stained can request a special stain-removing detergent by calling the county at 703-228-5000.