We apply scientific knowledge and innovation to improve watershed health for community benefit.
Tualatin Basin Water Supply and Flow Restoration
Clean Water Services, local cities and water providers are working to secure a long-term water supply for municipal, industrial, agricultural, and environmental needs. CWS staff partners with water resource managers to explore opportunities to improve watershed health and enhance stream flows. In addition to our timed releases with the Hagg Lake facility, we also work with farmers along Gales and McKay Creeks to enhance stream flows and support watershed health.
Regional Stream and Wetland Enhancements
We’re working on a variety of projects, including aquatic habitat enhancement, riparian planting, wetland restoration and treatment facility upgrades across urban and rural areas of the Tualatin River Watershed.
- Enhancing urban streams and wetlands is an investment that pays dividends in many ways.
- Clean Water Services partners with the agricultural community to meet regulatory obligations and mutual goals for watershed health. Learn about Enhanced CREP and VEGBAC programs for rural landowners.
Water Quality Credit Trading Annual Report (2021)
A watershed based NPDES permit allows Clean Water Services to offset thermal loads from the Rock Creek, Durham, and Forest Grove treatment facilities by implementing a water quality credit trading program for temperature. The 2022 Water Quality Credit Annual Report (PDF) offers information on temperature-related activities during the period of January 1 through December 31, 2021.
Sanitary Sewer Master Plan
Clean Water Services is responsible for planning improvements to its facilities and the collection system and creating a Sanitary Sewer Master Plan. The intention of a master plan is to identify improvements to provide adequate capacity for current and future needs. CWS prepares new plans approximately every 10 years and considers a 20-year planning horizon. Clean Water Services takes a unique approach to sanitary planning by integrating its Sanitary Sewer Master Plans and Water Resource Recovery Facility Master Plans. CWS develops the plans with governmental partners by projecting residential, commercial, and industrial redevelopment and growth while anticipating increasingly stringent regulatory requirements. CWS develops geographically based improvement plans to the conveyance and treatment system using traditional and state-of-the-art treatment technologies to meet and exceed regulatory requirements.
East Basin Master Plan
- Conveyance System and Durham Water Resource Recovery Facility
- The Clean Water Services Board of Directors adopted the plan April 5, 2022, by Resolution and Order 22-6.
- Serving Tigard, Tualatin, Sherwood, King City, Durham, and portions of Beaverton, Portland, and Lake Oswego.
Executive Summary (PDF)
Comprehensive Technical Memos:
- TM 01 – Goals and Planning Criteria (PDF)
- TM 02 – Study Area Characteristics (PDF)
- TM 03 – Climate Sensitivity (PDF)
- TM 04 – Regulatory Update (PDF)
- TM 16 – Geotechnical Seismic Hazards Assessment (PDF)
Conveyance System
Conveyance Technical Memos (TM):
- TM 05 – Flow Development (PDF)
- TM 06 – Model Development (PDF)
- TM 07 – Infiltration and Inflow Evaluation (PDF)
- TM 08 – Conveyance System Alternatives (PDF)
- TM 09 – Conveyance Implementation Plan (PDF)
Durham Facilities Plan
Durham Water Resource Recovery Facilities Plan Technical Memos:
- TM 10 – Flow and Load Projections (PDF)
- TM 11 – Liquids Treatment Process Capacity (PDF)
- TM 12 – Solids Capacity Evaluation (PDF)
- TM 13 – Liquids Treatment Process Alternatives (PDF)
- TM 14 – Solids Treatment Alternatives (PDF)
- TM 15 – Recommended Plan (PDF)
West Basin Master Plan
- Conveyance System and Rock Creek, Hillsboro, and Forest Grove water resource recovery facilities.
- Currently in development, completion anticipated by the end of 2023. Serving Hillsboro, Forest Grove, Cornelius, North Plains, Banks, Gaston, Aloha, North Bethany, and portions of Beaverton.