Water Main Flushing

Due to COVID-19, spring/summer 2020 water main flushing scheduled has been modified. Please refer to the scheduled below.

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.

2020 Scheduled Districts

  • Week of June 8: District 11
  • Week of June 22: District 10
  • Week of July 6: District 12
  • Week of July 20: District 13
  • Week of August 3: District 14
  • Week of August 17: District 15
  • Week of August 29: District 16
  • Week of September 14: District 17
  • Week of September 28: District 18
  • Week of October 12: District 19
  • Week of October 26: District 20

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
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