Our Facilities

Clean Water Services cleans 60 million gallons of wastewater each day for more than 560,000 customers in urban Washington County. The wastewater is collected by a vast network of more than 800 miles of sewer pipes and 40 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, and Tualatin, and small portions of southwest Portland and Lake Oswego. The facility, located in Tigard near Cook Park and Tigard High School, cleans 26 million gallons of wastewater on an average day to some of the highest safety and quality standards in the nation. 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. View Durham Facility At-a-Glance (PDF, 2.1MB) and 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.

Constructed in 1970, the facility was upgraded in 1993, 1997 and to achieve maximum versatility, and now operates predominantly in the rainy season from November through April. In the summer, the wastewater is pumped to the Rock Creek Facility on River Road 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.

Since completion of the Hillsboro facility expansion in 1997, every parameter of our National Pollution Discharge Elimination System (NPDES) permit has been met. The Hillsboro facility won an EPA Operation and Maintenance Excellence Award in 2003.

Rock Creek Treatment Facility

The Rock Creek Facility, located at 3235 SW River Road in Hillsboro, provides wastewater treatment for the City of Hillsboro, portions of Beaverton, Aloha, and unincorporated areas in Washington County. The Rock Creek, Hillsboro and Forest Grove facilities are connected by pipeline and 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.

Our Rock Creek facility provides advanced treatment to wastewater, including phosphorous and ammonia-nitrogen nutrient removal, and effluent filtration. Rock Creek also provides Level IV effluent for irrigation water for public application. Biosolids streams from the Hillsboro and Forest Grove facilities as well as a portion of these plants' influent flow are 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. The facility cleans 39 million gallons of wastewater on an average day, releasing water so clean it improves Tualatin River water quality.

Rock Creek is currently under expansion. The upcoming phases of construction will allow this facility to meet the community's needs well into the future. View Rock Creek At a Glance (PDF, 1.5MB) and take 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 provides secondary treatment using an activated sludge process followed by ultraviolet disinfection. The Forest Grove, Hillsboro and Rock Creek facilities are connected by pipeline and are integrated in terms of operational requirements. As such, responsibility for operating the facilities is also consolidated.

The Forest Grove Wastewater Treatment Facility Liquid Stream Upgrade project was completed in 2010. Principal new features that replaced outdated and undersized facility components are a headworks, influent pump station, grit building, and aeration basin. The Forest Grove facility has had an exemplary record. Our goal is to provide the highest degree of treatment possible while holding down the cost of operation.

Learn about the work being done at Fernhill Wetlands next to the Forest Grove Treatment Facility.

Administrative 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.

Tour Form

Receive news on what we are doing in the community and our innovative solutions to continue on providing clean water.