Performance of Rapid Rate Filtration Plants in Washington

Optimizing rapid rate filter performance for turbidity (particle) removal provides better public health protection for consumers.

Each month, rapid rate treatment plants across the state submit operations reports to document regulatory compliance. We enter maximum daily turbidity values from the 56 active treatment plants into Optimization Assessment Software and rank systems according to their relative performance.

Washington State Rapid Rate Treatment Plant Performance Trends (PDF) shows turbidity reduction performance improvement by all rapid rate treatment plants in Washington as a group from 2001 through 2021. Improved performance means improved public health protection. Read more about optimization criteria (PDF).

By optimizing water quality produced by their existing facilities, these utilities are able to cost-effectively provide a larger margin of safety and build greater resiliency to handle natural disasters and other unforeseen events.

Congratulations 2021 TOP Performers!

Turbidity monitoring data for 2021 show that Washington's conventional and direct filtration surface water treatment plants continue to perform above national regulatory standards—and provide better public health protection.

Four systems are continuing their run of excellence and have now reached 21 consecutive years of optimization!

We also award bronze, silver, gold, and platinum certificates to systems the first time they meet the turbidity goals for 3, 5, 10, and 15 consecutive years, respectively. This year, two systems earned a gold award, two earned silver awards, and two earned a bronze award.

Congratulations to the treatment plant operators, utility managers, and decision makers for making this happen!

Twenty-Year Award

  • Arlington Water Department (2001-2021)
  • Lake Whatcom Water and Sewer District—South Shore Water System (2001-2021)
  • Pasco Water Department (2001-2021)
  • Skagit County PUD #1—Judy Reservoir System (2001-2021)

Platinum Award Recipients (15 or more years)

  • City of Kelso (2006-2021)

Gold Award Recipients (10 to 14 years of continuously optimized performance)

  • Ryderwood Improvement & Service Association (2008-2021)
  • River Bend Water System (2009-2021)
  • City of Yakima (2010-2021)
  • City of Bellingham (2011-2021)
  • Town of Metaline Falls (2012-2021)*
  • Castle Rock Municipal Water (2012-2021)*

Silver Award Recipients (Five to nine years of continuously optimized performance)

  • Olympic View (2013-2021)
  • Department of Energy/200 W (2015-2021)
  • Hoquiam Water Department (2015-2021)
  • Lake Chelan Reclamation District (2015-2021)
  • City of Anacortes (2016-2021)
  • Carson (2016-2021)
  • Friday Harbor (2017-2021)*
  • Raymond Water Department (2017-2021)*

Bronze Award Recipients (Three or four years of continuously optimized performance)

  • Seattle Public Utilities (2019-2021)*
  • Port Angeles (2019-2021)*

* First-time award recipient for 2021.

Get the information and assistance you need to improve treatment plant performance by contacting your regional ODW office.

Eastern Regional Office, Russell Mau 509-329-2116

Northwest Regional Office, Jolyn Leslie 253-395-6762

Southwest Regional Office, Connor Lockwood 360-236-3019