King County Water District #90
15606 SE 128th Street
Renton, WA 98059
425-255-9600 Office
425-277-4128 Fax
Contact via E-mail


January 1, 2017Preventing Frozen Pipes

Freezing weather often approaches unexpectedly and many organizations find themselves unprepared. Organizations with buildings located in a moderate climate are often more at risk of facing frozen pipes and water damage due to the lack of experience or attention given to cold weather preparation.

When water freezes, it expands up to ten percent in volume. It is important to note that fire sprinkler pipes tend to freeze before other water pipes because the water is not moving. When water freezes in a sprinkler pipe, it creates an obstruction that can make the system inoperable during a fire. As ice in the pipe expands, added pressure can cause the pipe to burst.

As freezing temperatures approach, the following guidelines will help organizations identify areas venerable to freezing conditions and provide tips for prevention of frozen pipes.

Prior to Cold Weather:

  • Develop a water intrusion plan that includes winterization.
  • Identify buildings, equipment, processes and piping (wet and dry) that are dependent upon heat (or above freezing temperatures) for safety and proper operation; this may include sprinkler piping, domestic water piping, sewer piping and any process that contains a liquid vulnerable to freezing.
  • Minimize the exterior openings to all buildings, especially vacant buildings.
  • Drain liquids from any idle equipment and piping where appropriate.

During Cold Weather:

  • Monitor weather temperatures in vulnerable areas. Critical operations and areas should be monitored with low temperature alarms connected to a monitoring station.
  • Close windows, vents and doors of buildings and insulate where possible. Tarps may be used to provide temporary wind breaks.
  • Increase security rounds in areas that are susceptible to pipe freezing and water damage.
  • Maintain an inside temperature above 40 degrees Fahrenheit. Place portable heaters in areas that may be subject to freezing. Conduct routine inspections of portable heaters.

NOTE: Fires often result from the misuse of temporary heaters. When purchasing or renting a temporary heater, the heater should carry the Underwriters Laboratories listed label. Temporary heaters also should have standard safety controls, such as high-temperature cut-outs, flame supervision, flame failure and preset safety regulators. Heaters must be placed away from combustible materials and operated according to manufactures instructions.

In the event all efforts fail to keep a building heated and temperatures drop below 32 degrees Fahrenheit, it may be necessary to shut off and completely drain wet pipe fire sprinkler systems to prevent further damage. Any sprinkler system shut down must be done for the shortest possible duration and fire system impairment procedures must be followed.

  • If pipes freeze, turn off the water supply and repair the damaged piping. If the frozen pipe is part of a fire sprinkler system, Fire Impairment Procedures should be implemented.
  • Do not use open flames to thaw frozen pipes or other equipment.

Should you have further questions on cold weather preparation for you building, please do not hesitate to contact Alliant Risk Control Consulting at


Water and sewer districts throughout the state are taking all steps necessary to continue providing safe and reliable water and sewer services for the duration of this emergency.



If you would like to attend a public meeting by phone, please email our office ( in advance. Thank you! 

March 20, 2020Letter to Customers Regarding Access to Clean and Safe Drinking Water; Payment Options

As the Coronavirus continues to impact our region, we want to assure you that you will continue to have access to clean and safe drinking water. We understand that water is critical to our individual and global virus response.

With so much uncertainty, we know that customers may be concerned about paying their bills. For the duration of the declared emergency in the State of Washington, KCWD90 will not be disconnecting customers for non-payment. In addition, we are also suspending late fees. If you would like to set up a payment plan or other payment arrangements, please contact the office at to discuss options. District staff will still read your meter, and you will receive a bill on your regular bi-monthly schedule.

Employee safety is a priority! Office and Management employees are working from home as much as possible. Field Crew employees, who ensure your water continues to be delivered to your home, are working one week in the field and one week at home. We hope that by separating our workforce, we will continue to have healthy crew members during all phases of this pandemic to ensure that safe, potable water continues to flow to your taps.

The District office is closed to walk-in traffic. Our office staff will be collecting payments from the dropbox every day. Also, you can still make payments through our website, through your bank, or you can sign up for draft payments.

Our office staff is still available to answer your billing and water quality questions. Please send your questions via email to If it is an emergency, please call us at 425-255-9600. If your call is after hours, the answering service will contact our "on-call" field employee.

Sincerely, Darcey Peterson, General Manager, KCWD90

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