Water Main Flushing

Rockville has a systematic flushing program to remove accumulated sediment from the water system and improve water quality. Sediment can cause water discoloration, degrade water quality, and impede fire hydrant water flow, so it is removed from pipes by the planned opening and closing of certain valves and fire hydrants. Chlorine is removed from the water prior to flushing to safeguard the environment.

Rockville maintains approximately 180 miles of water pipes, 4,100 valves, and 1,300 fire hydrants. The city is divided into 39 water main districts that undergo water main flushing in rotating cycles. Flushing hours are Monday – Friday from 7 a.m. – 3 p.m. Some parking restrictions may occur to allow access to water valves.

Low water pressure and discoloration may occur due to water main flushing, repairs, disruptions, or maintenance. If you experience discoloration, run cold water until the water runs clear. These conditions are temporary and should clear up within a few hours.

2026 Scheduled Districts

• Week of June 1-5: District 37
• Week of June 8-12: District 4
• Week of June 15-19: District 1
• Week of June 22-26: District 2
• Week of July 6-10: District 3
• Week of July 13-17: District 11
• Week of July 20-24: District 12
• Week of July 27-31: District 13
• Week of Aug. 3-7: District 14
• Week of Aug. 10-14: District 17
• Week of Aug. 17-21: District 19
• Week of Aug. 24-28: District 20
• Week of Aug. 31-Sept. 4: District 22
• Week of Sept. 14-18: District 28
• Week of Sept. 21-25: District 29
• Week of Sept. 28-Oct. 2: District 33
• Week of Oct. 5-9: District 34
• Week of Oct. 12-16: District 35
• Week of Oct. 19-23: District 38