Water Main Flushing Program
Water main flushing is one of the most important things we do. Find out how our program puts Madison on the forefront of water safety and quality.
The 2014 Water Main Flushing program began the week of April 21.
Flushing Schedule beginning Monday, 10/20/14 (all flushing daytime unless otherwise noted)
- EAST (Area 8) - Starkweather Creek to Divison St south of St Paul Ave and the Union Pacific Railroad tracks
- EAST (Area 25) - East of Meadowlark Dr from Commercial Ave to Cottage Grove Rd
- WEST (Area 12) - South of Mineral Point Rd and east of Midvale Blvd
- WEST (Area 16) - Gammon Rd to Rosa Rd from the Beltline to Old Sauk Rd
- WEST (Area 28) - Old Sauk Rd to Mineral Point Rd from High Point Rd to Gammon Rd; THEN north of Old Sauk Rd between Gammon Rd and Old Middleton Rd
More Information About Flushing
During the flushing season, most crews work between 6:00 a.m. and 4:00 p.m. Monday through Friday, with one crew (and sometimes more) working at night from 10:00 p.m. to 6:00 a.m., primarily in the central isthmus and university areas.
What is the Water Main (Hydrant) Flushing Program?
To improve water quality and minimize discoloration, City of Madison water mains are comprehensively flushed by a technique known as unidirectional flushing. The procedure is performed in warm-weather months and involves the systematic opening and closing of hydrants, one section of main at a time, to force the water through the pipes at high velocity, removing accumulated mineral sediment until the water is clear. The operation can take from a few minutes to over an hour, although most last about 30 minutes.
Unidirectional flushing differs from conventional flushing in that it involves the closing of adjacent valves and the use of a single hydrant per flush so as to isolate individual sections of main. Conventional flushing also removes accumulated sediment from pipes, but it involves the flushing of multiple hydrants at a time and does not include the valving off of individual sections of main, thereby diminishing the “scouring” efficiency. Conventional flushing is used in areas of the city where fewer minerals build up in the mains.
How Will Flushing Affect Water Service?
When flushing crews are working close to your residence or business, you may experience periods of very low pressure or even a complete stoppage of service. We attempt to notify customers in advance if flushing is expected to result in a complete water outage, but such outages are rare.
Flushing operations may also lead to discolored water, which can be drawn into homes and businesses if the water is being used during or immediately following the flushing. Such events should affect customers for a few hours at most. The discoloration is caused by iron (red color) or manganese (black color) particles being dislodged from the water main which can stain porcelain and laundry. If discoloration occurs, open the cold tap nearest the water meter—usually a basement sink—to full flow until the water runs clear. In some situations this may take 5 to 10 minutes. It is also advised that you make sure your water is clear before doing laundry or other projects for which discolored water could cause problems.
A precise schedule of flushing operations is difficult to determine more than a day or two in advance. If you wish to be notified before work will be done in your area, please call Shayne Santi at 261-9128 or email email@example.com.
We ask for your patience and understanding during this critical main cleaning process.