Water Main Flushing

Rockville has a systematic flushing program to remove accumulated sediment from the water system. The city is divided into 39 districts and undergo water main flushing in cycles.

Flushing Hours
Monday - Friday from 7 a.m. to 3 p.m.

2018 Scheduled Districts

  • District 22: September 10 - 14
  • District 13: September 17 - 21
  • District 14: September 24 - 28
  • District 15: October 8 - 12
  • District 16: October 15 - 19
  • District 39: October 22 - 26
Some parking restrictions may occur to allow access to water valves. As flushing takes place, some temporary discoloration may occur.

Repairs, disruptions and maintenance to water mains may cause your water to be discolored.

If you experience discoloration, run the cold water until the water runs clear. These conditions are temporary and should clear up within 2-3 hours.
 Still have questions? Contact: 

Operations and Maintenance
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240-314-8567
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Monday - Friday
8:30 a.m. - 5:00 p.m.



Water Main Flushing Process

The city removes the chlorine from the water prior to discharge to safeguard the environment. 

Rockville maintains:

  •  Approximately 180 miles of water pipes.
  • 4,168 valves.
  • 1,363 fire hydrants. 

The sediment, which can cause water discoloration, degrade water quality and impede fire hydrant water flow, is removed from the pipes by the planned opening and closing of certain valves, as well as the opening of fire hydrants.

The City of Rockville is committed to providing the best possible services to customers. This work is part of ongoing efforts to improve water quality and delivery citywide.

Annual Drinking Water Quality Report