Flushing Program Keeps Clean Water Flowing

Posted Thursday, March 12, 2020

As part of Skagit PUD’s ongoing maintenance and water quality efforts, the PUD conducts a water line flushing program throughout its 600 mile water system.

What is flushing?

Flushing is a process that rapidly removes sediment from the PUD’s water piping system, similar to the process of flushing a car’s radiator. Flushing uses water force to scour out materials that accumulate in pipes. Water pipes are usually flushed by opening fire hydrants, where the discharged water flows off the streets the same as rainwater. The water flow is measured and the chlorine in the water is neutralized.

Why are you flushing?

Imagine driving down the road at less than 1½ miles per hour. That’s about the rate that water moves through underground pipes. This slow movement causes sediment, such as rust and mineral particles, to build up over time and accumulate along the pipe’s bottom. A buildup of harmless microorganisms can also coat the pipe’s inner surface. If left unchecked, the materials can restrict water flow in the pipes and contribute to the pipe corroding.

Rapid water pressure changes, such as water main breaks and the use of fire hydrants, can stir up the sediment and dislodge deposits lining the pipe, resulting in “dirty water” appearance.

Periodically flushing water pipes removes the material buildup, maintains infrastructure, and assures consistent, good quality water.

Isn’t flushing a waste of water?

Although it may appear to waste water, this process is part of routine maintenance necessary to maintain the integrity of the water system and to continue to deliver the highest quality water possible to our customers.

Skagit PUD is committed to water use efficiency and good resource management practices. The flushing program is monitored to ensure that the least amount of water is used. The PUD continually analyzes system-wide performance standards to minimize water use, including on-going efforts to identify and repair leaks.

How will this affect me?

In advance of crews being in your neighborhood, Skagit PUD contacts customers via door tag notification. Residential flushing is generally conducted between 9 a.m. and 1 p.m., Monday through Friday. For businesses and medical services, crews attempt to coordinate times to ensure the least degree of impact. At each location, water meters are turned off to help prevent dislodged material getting into customer lines. This will result in a disruption of your water service during the flushing process.

For a few minutes following flushing, some sediment might get into your home’s plumbing. If this happens, please be patient and allow your cold water to run for a few minutes at full velocity. During this time, you should avoid using hot water to prevent sediment accumulation in your hot water tank.