How we clean and recycle wastewater

Clean Water Services cleans 60 million gallons of wastewater daily for nearly 500,000 customers in urban Washington County. The wastewater is collected by a vast network of more than 800 miles of sewer lines and 39 pump stations and routed to one of four treatment plants—Durham, Rock Creek, Hillsboro and Forest Grove. 

We use physical, biological, and chemical treatment to clean wastewater to some of the highest standards in the nation. The cleaned wastewater is then released into the Tualatin River.

• Our treatment process
• Our treatment facilities