About the Project:
The Black Diamond Sewer Upgrade Project will increase capacity for 6 miles of regional sewer pipe. King County is upgrading the regional sewer pipe to support Black Diamond’s growing community. In 1992, the City of Black Diamond built the Black Diamond Trunk sewer pipe with support from King County. Now, the pipe is reaching capacity. King County plans to upgrade it to serve the growing population by repairing, expanding, or adding new pipes. The Black Diamond Trunk Sewer carries wastewater from the City of Black Diamond. The existing pipe is located north of the City between Black Diamond and Covington.
Descripción general del proyecto:
El Proyecto de Mejora del Alcantarillado de Black Diamond aumentará la capacidad de 6 millas de tuberías de alcantarillado regional. King County está mejorando de tuberías de alcantarillado regional para apoyar a la creciente comunidad de Black Diamond. En 1992, City of Black Diamond construyó la tubería de alcantarillado troncal de Black Diamond con el apoyo de King County. Ahora la tubería está llegando a su capacidad máxima. King County planea modernizarla reparando, ampliando o agregando nuevas tuberías para prestar servicios a la creciente población. El alcantarillado troncal de Black Diamond transporta aguas residuales desde la ciudad de Black Diamond hasta la South Treatment Plant en Renton. La tubería existente está ubicada al norte de la ciudad entre Black Diamond y Covington.
Los servicios de interpretación y traducción están disponibles para usted sin costo alguno. Si los necesita, comuníquese con Annie Plumley, BDSewerUpgrade@kingcounty.gov, (206) 263-3203.
Ready to start your career in wastewater treatment operations? Apply for the Operator-in-Training Program today!
 We are hiring for multiple Operator-In-Training (OIT) positions for 2026. This hands-on, paid training program can lead to a rewarding career in clean water services. During your first six months, you'll learn the skills needed to operate essential wastewater treatment equipment and work toward earning a Washington State certification. As an OIT, you’ll play an important role in protecting the health of our communities and the environment.
Please note, you must have a high school diploma or GED to apply.
Applications are open until 11:59 p.m. on Monday, December 22!
Please follow this link to learn more about this opportunity and apply:
Looking inside a wastewater treatment lab
When you flush the toilet or wash your hands in the sink, water travels down the drain to a treatment plant to get cleaned before it can be released back into the environment.
Staff at the South Treatment Plant Lab in Renton test water samples from three of our treatment plants to ensure that the water we return to Puget Sound is clean and safe. They monitor microbes — key organisms that help break down organic waste — as well as nutrient and oxygen levels that can affect our environment and marine life. Join Wastewater Process Analyst Kennedy Tisdel to see the work happening in the lab.
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