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King County’s Vashon Treatment Plant honored for perfect compliance with environmental permits


King County’s Vashon Treatment Plant earned the coveted “Outstanding Performance Award” for perfect compliance with strict state and federal environmental permitting standards in 2017. The Washington State Department of Ecology manages the annual award program that honors treatment plants across the state for operational excellence and dedication to water quality protection.


The Washington State Department of Ecology honored King County’s Vashon Treatment Plant with a coveted “Outstanding Performance Award” for operational excellence that resulted in perfect compliance with all permit conditions in 2017.

The Vashon plant is one of 111 wastewater treatment plants out of about 300 statewide that received the recognition. To earn the award, the plant had to operate around the clock for the entire year with no violations of any kind. In addition to meeting or exceeding effluent pollution removal requirements, the plant operations also flawlessly complied with monitoring and reporting obligations, pretreatment requirements, and spill prevention planning.

“This is ‘The Experienced Water Project’”, said plant operator and long-time Islander Greg Burnham. “We’re committed to being a good neighbor, protecting the environment and promoting resource stewardship on the island.”

The plant was also the recipient of the National Association of Clean Water Agency’s “Platinum Peak Performance Award” for seven consecutive years of perfect compliance with effluent discharge requirements under the federal Clean Water Act and the state’s Water Pollution Control Law.

The Vashon Treatment Plant serves about 1,100 people who live and work within the Vashon Sewer District. The plant treats about 180,000 gallons of wastewater a day, with a capacity to handle up to 1.4 million gallons during storms.