Our Facilities

Clean Water Services cleans 65 million gallons of wastewater each day, on average, for over 600,000 customers in urban Washington County. The wastewater is collected by a vast network of more than 1,900 miles of sewer pipes and 43 pump stations and routed to one of our four treatment facilities—Durham, Rock Creek, Hillsboro and Forest Grove. The cleaned water is returned to the Tualatin River to be reused. We also have a Field Operations Office and Administrative Building Complex to best serve our communities. Learn more below or schedule a tour at one of our treatment facilities.

Durham Treatment Facility

The Durham Facility, located at 16060 SW 85th Avenue, Tigard, is an award-winning, state-of-the-art facility, serving Washington County residents in Beaverton, Durham, King City, Sherwood, Tigard, Tualatin, and small portions of southwest Portland and Lake Oswego. The facility cleans 26 million gallons of wastewater on an average day to some of the highest safety and quality standards in the nation.

The Durham facility, constructed in 1976, provides advanced treatment to wastewater, including phosphorous and ammonia-nitrogen nutrient removal, and effluent filtration. The cleaned water is returned to Washington County’s only river—the Tualatin — enhancing the health of the river. Cleaned wastewater is also used for local irrigation, and natural byproducts of the treatment process are converted to electricity, heat, and used as soil amendments at local sites and throughout the state. Durham was the first facility in the United States to recover fertilizer from a natural byproduct of wastewater treatment. Learn more about Ostara and its development at our Durham facility.

The Durham Advanced Wastewater Treatment Facility won the Environmental Protection Agency (EPA) 2006 National Clean Water Act Recognition Award for operations and maintenance excellence in large facilities with advanced treatment as well as numerous Gold awards from the National Association of Clean Water Agencies (NACWA). Learn more about the Durham facility's process (PDF, 1.2MB) or schedule a facility tour.

Hillsboro Treatment Facility

The Hillsboro facility, located at 770 S. First Avenue in Hillsboro, provides wastewater treatment for the cities of North Plains, Banks, the western region of Hillsboro, the southeastern portion of Cornelius, and the northwestern portion of Forest Grove. The facility cleans approximately 4 million gallons of wastewater on an average day.

The Hillsboro facility began operation in 1969 and provides primary and secondary treatment using an activated sludge process followed by ultraviolet disinfection. In the winter, cleaned wastewater is returned to the Tualatin River. In the summer, the wastewater is pumped to the Forest Grove facility for treatment. The Hillsboro, Forest Grove, and Rock Creek wastewater treatment facilities are connected by pipeline and are operated as three integrated units. This provides operation and system configuration choices that enable Clean Water Services to treat wastewater in the western basin as efficiently and effectively as possible.

The Hillsboro facility won an EPA Operation and Maintenance Excellence Award in 2003 as well as numerous Platinum and Gold NACWA awards. Learn more about the Hillsboro facility's process (PDF, 782KB) 

Rock Creek Treatment Facility

The Rock Creek Facility, located at 3235 SE River Road in Hillsboro, provides wastewater treatment for the City of Hillsboro, portions of Beaverton, Aloha, and unincorporated areas in Washington County. The facility cleans 39 million gallons of wastewater on an average day, releasing water so clean it improves Tualatin River water quality.

The Rock Creek facility, constructed in 1978, provides advanced treatment to wastewater, including phosphorous and ammonia-nitrogen nutrient removal, and effluent filtration. Biosolids streams as well as excess influent flows in the winter from the Hillsboro and Forest Grove facilities are also treated at Rock Creek. Biosolids are digested, processed, and dewatered at the facility. These biosolids are then land applied. Learn more about Ostara and its development at our Rock Creek facility.

The Rock Creek Advanced Wastewater Treatment Facility won the Environmental Protection Agency (EPA) 2006 National Clean Water Act Recognition Award for operations and maintenance excellence in large facilities with advanced treatment. Learn more about the Rock Creek facility's process (PDF, 1.3MB) or schedule a facility tour.

Forest Grove Treatment Facility

The Forest Grove Facility, located at 1345 Fern Hill Rd. in Forest Grove, provides wastewater treatment for Forest Grove, Gaston, and Cornelius. The facility began operation in 1951 and currently cleans approximately 4.5 million gallons of wastewater on an average day.

The facility provides secondary treatment using an activated sludge process followed by ultraviolet disinfection prior to discharge to the Fernhill Wetlands. In the summer, flow from Hillsboro is treated at Forest Grove. The Forest Grove, Hillsboro, and Rock Creek facilities are connected by pipeline and are integrated in terms of operational requirements.

The Forest Grove Treatment Facility have won numerous NACWA Platinum awards for outstanding performance over the years for perfect compliance of their National Pollution Discharge Elimination System (NPDES) Permit.

Learn more about the Forest Grove facility's process (PDF, 1.7MB) and explore the work accomplished at Fernhill.

Administration Building Complex (ABC)

Our Administration Building Complex at 2550 Southwest Hillsboro Highway is located adjacent to the Tualatin River and Jackson Bottom Wetlands Preserve. The complex built onto our existing water quality laboratory in 2003 and consolidated staff from four facilities into a single, central water resources campus totaling 69,000 square feet. 

The ABC earned LEED GOLD certification in 2005, the first LEED Gold certified public building in Washington County. Through the use of low-flow fixtures and the harvesting of rainwater to flush toilets, water usage is estimated to be 66 percent less than a comparable code building. The use of occupancy sensors, high-efficiency lighting, and an underfloor heating and cooling systems save an estimated 45 percent on energy costs. More than 60 percent of building materials were manufactured within 500 miles, supporting the local economy and reducing transportation costs. Natural ventilation, interior light shelves and the building’s orientation on the site deliver fresh air and high-quality natural light throughout the building. 

The complex includes Clean Water Services’ water quality lab, administration, source control, information systems, inspection, engineering, public affairs, human resources, and planning groups. The 2003 expansion allowed the District to restore a degraded site, construct a building that publicly demonstrates our environmental stewardship, and locate us adjacent to the river we serve.

Field Operations

Our Field Operations location at 2025 SW Merlo Court in Beaverton opened in 2003. Special design features and careful construction methods were used to protect local streams and the nearby THPRD Nature Park. The facility is a showcase for low impact development, balancing environmental protection and community building. 

Natural land and native vegetation absorb rainfall while buildings and pavement can create unnatural runoff that increases water pollution, temperature and erosion. To solve these problems, thoughtful design can mimic nature to create pavement and buildings that absorb water. The facility and parking lots were designed to manage surface water on-site. Instead of drainage pipes and catch basins that would carry water away, plantings and porous "softscaping" allow rain to soak into the ground and filter through plants. Runoff is reduced and slowed while water quality flowing to the creeks is improved.

Naturally, when Clean Water Services needed to build a new Field Operations Facility with lots of pavement and roof area, we went for an innovative design that would protect water quality. Innovations include:

  • Ecoroof - Soil and plants on the roof absorb rainfall and insulate the building.  
  • Porous Pavement - Allows rain to soak into the ground and stay cool.
  • Green Street - Gently sloped swales replace curbs and gutters to slow water and remove pollutants.

Schedule a tour and get a firsthand look at our state-of-the-art, award-winning wastewater treatment facilities.



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