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We are your clean water agency!

Maintenance staff

In 1958, King County citizens established a regional wastewater conveyance and treatment system to clean the polluted waters of Lake Washington and Puget Sound. More than 60 years later, we have dramatically cleaned up the waters of our region. In partnership with other jurisdictions, businesses and individuals, King County continues to protect the public health and environment while recycling and reusing natural resources.

Learn more about our history.

We take the "waste" out of "wastewater," by recovering energy, producing a safe soil amendment, and reclaiming water for reuse!


To us, success means clean water. It means honoring our legacy while keeping a promise to another generation that our beautiful environment will be there for them to enjoy.

It also means being accountable to our ratepayers and operating a well-managed agency.

Division employees plan, design, build, and operate treatment facilities to clean wastewater before discharging it into Puget Sound.

Our employees also enforce regulations to reduce harmful waste discharged to the system, and we educate the public and businesses on ways to protect water quality.

GIS staff Engineer

As an employer, King County attracts and supports employees committed to making a difference in our community. The work we do—health and human services, law enforcement, courts, parks, wastewater, transportation—makes a real difference to our neighbors.

King County Wastewater Treatment Division is committed to protecting public health and enhancing the environment by treating and reclaiming water, recycling solids, and generating energy. Fulfilling our mission requires a diversity of employees to build, operate and maintain our facilities.

Our award-winning agency offers careers in a wide range of fields. Come join one of the premiere wastewater treatment agencies in the nation.

Looking for College/Graduate Internships?
Click here for more information.

Career opportunities include:

  • Accountant
  • Administrative specialist
  • Chemist
  • Construction manager
  • Ecologist
  • Educator
  • Engineer
  • Events coordinator
  • Financial analyst
  • GIS analyst
  • HR professional
  • Industrial maintenance mechanic
  • Industrial instrument technician
  • Industrial waste compliance investigator
  • Lab technician
  • Project manager
  • Process laboratory specialist
  • Public information officer
  • Technical writer, editor and illustrator
  • Trainer
  • Volunteer coordinator
  • Wastewater treatment operator
  • Wastewater treatment utility worker
  • Water quality project planner/manager
  • Web developer

We offer competitive salaries and benefits that currently include:

Project manager
  • medical, dental, vision care
  • life insurance
  • public employees retirement system
  • generous vacation, sick leave, & holidays
  • deferred compensation options
  • annual bus pass

Learn more about King County benefits

WTD headquarters

Meet our staff

Cross-posted from KC Employee News
Meet Sonia-Lynn Abenojar, a Capital Project Manager with Wastewater Treatment Division, and the latest employee to feature in our “Diverse Careers” video series.

More videos: clean water jobs

Watch these short videos and learn about the role of laboratory specialists, operations staff, and maintenance staff in protecting human health and the environment every day.



WTD's Operations Challenge Team

The Poofighters -- King County's WTD Operation's Challenge TeamThe Poofighters are WTD’s team at the International Operations Challenge Competition sponsored by the Water Environment Federation. Learn more.

Contact us

Reach WTD Human Resources staff at

WTD in the news

King County Enhances Diversity Through Operator in Training Program , February 21, 2019 (WEF Highlights)

Blog: Clean water stories

1906_women-in-tradesWTD celebrates Women in Trades 40th anniversary, June 20, 2019

High School Clean Water Ambassadors2018 Clean Water Ambassador Internship, September 7, 2018

seasonal workers “When you come to work, you want to be in a happy environment. This is what we help create.” August 21, 2018

Finding hidden value at the bottom of a sedimentation tank, August 7, 2018

Biosolids and digesters and sludge, oh my! Summer interns tour South Plant, July 5, 2018

We help new employees learn – and they help take care of everyone’s sewer system, June 20, 2018

Applications for summer internships accepted through Feb. 25. And not the “get my coffee, do my filing” kind of internships, either…, February 1, 2018

Filing project streamlines record keeping and recruits new employees, January 2, 2018

Finding a job that fits you, pays well AND is meaningful is amazing. If you like freedom and change you might like operating a wastewater treatment plant. We’ll help you find out – and pay to train you. November 7, 2017

Employee channels passion for clean water into career, May 23, 2017

Raise Your Hand if You Knew You Would Do This Job, April 27, 2017 

Students Test the Science and Engineering Behind Water Systems, April 21, 2017

The Changing Face of Capital Project Management, March 10, 2017

We Put Ourselves in Tight Spots to Care for Our System, February 6, 2017

Bright Lights in Our Workplace, January 18, 2017

Beyond the Call of Duty, January 17, 2017

Celebrating 105 Years of Combined Service - and No Regrets, November 4, 2016

View more articles about Careers That Matter.

When you come to work at King County's Wastewater Treatment Division, you'll get more than a paycheck (though that's nice too). Learn more  .

Why join us? To be part of the solution! Come make clean water with us! Download brochure  .

A Best Diversity Company, 2014
WTD named a diversity leader
, September 10, 2014 (King County employee news)