What is Water System Flushing? 

Flushing is the process of cleaning or “scouring” the interior of water distribution mains (pipes) by sending a rapid flow of water through the mains. It is an important part of water distribution maintenance for several reasons but mainly aids in the improvement of drinking water quality.

Flushing involves isolating a section of the water distributions system and opening hydrants to release water at a high flow rate. The increased flow helps remove material that has built up over time in the mains, such as minerals and accumulated sediment.

If you see a cone by rushing water, this indicates an operator has left this flush valve open (or is ‘exercising’ the flush valve) and will return to shut it off. 

Reasons Flushing Is Important

Bacteria Control – Biofilm growth can occur when an area becomes stagnant.

Taste & Odor Control – Flushing removes many of the deposits, sediment, and other materials that can affect taste and odor.

Corrosion Control – The rapid flow of water scour the inside of lines and reduces corrosion.

Flushing also ensures fire hydrants and valves are working properly.

What should I do if my water is discolored after flushing the water mains?

Water is sometimes discolored after water main cleaning, but this should not last long. In the event, customers draw discolored water into the home, flush a cold tap only a few minutes, up to 15 minutes maximum. As a precaution prior to using hot water run the cold water tap for a few minutes to ensure discolored water is not drawn into the hot water tank.

What should I do if the water is still discolored after three to four hours?

Contact Quadvest at 281-356-5347

How long does it take to clean the water mains on each street?

It takes about 30 minutes to 60 minutes to flush the water mains on each street.

Why can’t be performed at night?

It’s safer for staff to work on the streets in daylight. Also, daylight provides better visibility to see when all the sediment has been flushed out and the water is running clear.

Is water main cleaning a waste of water?

No, this is a normal and necessary part of maintaining a safe and reliable drinking water supply. If water is discharged into the environment, it will soak back into the groundwater basins for reuse.

How will I be affected?

Flushing will generally occur between 8 a.m. and 4 p.m. for most neighborhoods. Specific hydrants will be used to discharge water. There may be a slight drop in pressure or noticeable discoloration of the water from the minerals and sediments that are being flushed out. Water service should not be disrupted during the flushing process.

What about water pressure and safety?

Flushing may cause short-term pressure fluctuations along with sediments in the water reaching your home or business, try to not use water during this time. Your water remains safe, meeting if not exceeding all water quality standards.

To clear your water

• Quadvest advises customers to flush a cold tap for a few minutes, for up to 15 minutes maximum. Do not choose a tap that has a water filter connected to it, or the sediment may clog your filter. Do not use a hot water tap because it could draw sediment into your hot water tank
• Catch some water in a light colored cup or container, if it is clear, you can use your water.
• If the water coming from the tap doesn’t clear in five minutes, wait 30 minutes and try again.

Chlorine smell

• Quadvest adds only enough chlorine in the treatment process to keep the water safe for consumption. Customers can easily get rid of the chlorine taste and smell by filling an open container with water and keeping it in the fridge for drinking – much of the chlorine will leave the water overnight.

Material used from WMWD