System Flushing

 

We flush the water lines quarterly, generally on the second Tuesday and Wednesday of February, May, August, and November.

For 2026 the scheduled flush dates are:
– February 10th (Tuesday) and February 11th (Wednesday)
– May 12th (Tuesday) and May 13th (Wednesday)
– August 11th (Tuesday) and August 12th (Wednesday)
– November 9th (Monday) and November 10th (Tuesday) (To avoid Veterans Day: NW Natural Water closed that Wednesday).

Two dates are needed to flush the entire distribution system and that is a function of how much water our reservoir can hold and how large our distribution system is: it is not feasible to flush the whole system on one day as we would run the reservoir dry.

We will provide members email reminders of the scheduled flush dates, but we are unable to confirm the exact times that the flush period will start or end on that date. We do not shut off the water during system flush events. Water is always available. However, it is possible that using water during a flush event could draw in cloudy or discolored water from the public water system into your home’s plumbing system.

What should I do when flushing is happening?

Avoid using tap water, especially hot water if you have a hot water tank, and avoid running the washing machine or dishwasher. Wait until flushing is done.

What should I do when flushing is done?

If you used your tap water during flushing, water could appear cloudy or discolored. This is only a temporary effect and will clear out soon.

If you encounter discolored water, shut the tap off and wait several minutes, then run cold water thru the bath tub or outside faucet for a few minutes. DO NOT run hot water to prevent discolored water from going into your hot water tank. If the water is clear, it is okay to use. If not, wait a few more minutes and repeat the process.

Why is system flushing necessary?

System flushing enhances water quality by flushing sediment from water mains and verifies proper operation of flushing hydrants and valves.

Why is the water discolored?

When a flushing valve is opened, fine sediment particles are flushed out at high speeds, which could cause discolorization. Rest assured, there is no health hazard associated with discolored water.