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.

2021 Scheduled Districts

  • Week of July 12: District 29
  • Week of July 19: District 30
  • Week of July 26: District 31
  • Week of August 9: District 32
  • Week of August 16: District 33
  • Week of August 23: District 1
  • Week of September 6: District 2
  • Week of September 13: District 37
  • Week of September 20: District 3
  • Week of October 4: District 4
  • Week of October 11: District 35
  • Week of October 18: District 36

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