Treatment Plant Supervisor

City of Bainbridge Island, Washington
280 Madison Avenue North, Bainbridge Island, Washington
Job Type
Job Post Expires On


Treatment Plant Supervisor

City of Bainbridge Island, Washington

Salary$98,603 - $123,644 (2023 salary increase to be determined)


Located 35 minutes by ferry from Seattle and connected to Kitsap County by bridge, Bainbridge Island, Washington, enjoys a wonderful combination of scenic vistas, urban forests, trails, farms, wineries, and local arts, and more than 25,000 people call Bainbridge Island home. The city, with input from the community, has managed to preserve its friendly aura, small-town charm, and natural environment. Islanders value the sense of country living and nearby access to Seattle's business and cultural resources. Cultural sites include the Bainbridge Island Museum of Art, Bainbridge Island Historical Museum, Bloedel Reserve, Islandwood, Japanese American Exclusion Memorial, and Bainbridge Performing Arts.


The City of Bainbridge Island’s Public Works Department plans, designs, constructs, operates, and maintains public improvements, facilities, and equipment owned by the City and the public. The Department includes 48 full-time equivalent employees. The Department manages a 140-mile network of roads, and operates three utilities: water, sewer, and stormwater. The Department operates on a 2022 budget of $12.4 million. The Operations and Maintenance Division includes 28 FTEs and oversees the operations of the City’s utilities, along with the maintenance and upkeep of City roadways, public facilities, and fleet. The City operates an island-wide stormwater system, and a water and sewer system concentrated in the downtown core, which includes a wastewater treatment facility. The Engineering Division is made up of a capital projects group, a water resource group, and a team of development review engineers. The Wastewater Treatment Plant is a Class 3 secondary-activated sludge plant, located in Winslow near the ferry terminal, that employs dissolved oxygen for solids treatment and ultraviolet light for disinfection. Each year, the plant treats 150 million gallons of wastewater with typical conventional pollutant removals above 97%. The treated wastewater is discharged east of Wing Point into the Puget Sound. Plant activities are regulated by the State of Washington Department of Ecology, and the plant maintains an accredited water quality laboratory.


Reporting to the Public Works Manager, the Treatment Plant Supervisor oversees the City’s Wastewater Treatment Plant. Along with the supervisor, the plant is run by four operators. The Treatment Plant Supervisor has day-to-day responsibility for supervising the plant staff, operations and regulatory compliance. This position works closely with the Public Works Field Supervisor and Public Works Manager to ensure effective system administration, contract and project work planning, coordination, scheduling, emergency operations and other related duties. The Treatment Plant Supervisor will collaborate with staff and outside consultants as a member of the capital project team which will oversee replacement of the aging ultraviolet disinfection system, rebuilding of system pumps, and extension of the plant outfall to Puget Sound.


A bachelor’s degree in public administration, construction, engineering, or a related field, and five (5) years of progressively responsible experience in public works, with three (3) or more years of supervisory experience; OR any combination of experience, education and training that would provide the level of knowledge and ability is required. (See full job description for additional requirements.)


For a complete position profile, full job description and to apply online, visit Prothman at and click on "Open Recruitments". For questions, call 206-368-0050. The City of Bainbridge Island is an Equal Opportunity Employer. Applications accepted through November 20, 2022. This position is open until filled. Applications will be reviewed as submitted.