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Service Area Assets Map
The Salmon Creek Treatment Plant is owned by the Discovery Clean Water Alliance, which is a partnership consisting of Clark County, the Clark Regional Wastewater District, and the cities of Battle Ground and Ridgefield. The Alliance was formed in 2013 to jointly manage wastewater infrastructure critical to the region’s economic and environmental health.
Members
- City of Battle Ground
- City of Ridgefield
- Clark County
- Clark Regional Wastewater District
Service Area Assets
- Gravity interceptors
- Pump stations
- Force mains
- Treatment plants
Salmon Creet Treatment Plant aerial photograph.
Providing Reliable Wastewater Service
The Salmon Creek Treatment Plant is the last part of the wastewater conveyance system. All sewer pipes and pump stations are designed with one purpose: to reliably carry wastewater from homes and businesses to the treatment plant. Wastewater is then treated to regulatory standards and released back into the environment.
The plant is an essential part of our public infrastructure. It serves nearly 48,000 homes and businesses in our service area. Our highest priority is keeping the plant operating to industry standards, while meeting all environmental regulations. The plant has 14 full-time staff, including managers, maintenance technicians, certified operators, and a laboratory analyst.
To ensure the plant operates in a safe, reliable and cost-effective way, all plant operations are monitored 24 hours a day, 7 days a week through a modern, automated computerized control system. Backup generators ensure operations run consistently at all times, even in the event of a power outage. The entire perimeter of the site is fenced for safety.
Salmon Creek Construction Timeline
Construction is underway on the first of three projects and will lead immediately into two others through 2025.
Click on picture to enlarge
New Biotrickling Filters and Carbon Adsorbers
This project includes installing new odor control systems at the front and back ends of the plant:
On the front end, new biotrickling filters will treat air from the preliminary treatment and primary treatment processes. In order to help collect the air for treatment, new aluminum or fiberglass covers will be added over the Primary Clarifiers.
On the back end, new carbon adsorbers will treat air collected from the solids treatment process. These methods have proven very effective in reducing odors and the technologies were selected to specifically treat odors generated at each end of the facility.
Construction Activities and Impacts
Construction will usually be limited to the hours of 7:00 a.m. to 7:00 p.m., Monday through Friday. However, some evening and weekend work may be required.
Contractor vehicle access to the Plant will occur via NW McCann Road.
Please remember to remain a safe distance from the treatment plant, especially during construction. It is an active industrial site. If you have questions or concerns, please contact Thomas Lebo, Alliance Construction Program Manager, (360) 993-8816
Click on pictures to enlarge
Construction Activities and Impacts
Design and permitting for the project is currently underway, with construction anticipated to begin in either 2021 or 2022, depending on permit approval. Special care is being taken to make sure that construction, installation, and operation of the replacement effluent pipeline and outfall will be environmentally sound, cost-effective, fiscally responsible, and address neighbor and ratepayer concerns. The new pipeline will require minimal energy and maintenance to operate. The existing pipeline will be retained to facilitate continuous treatment plant operation during the transition and routine maintenance.
Benefits
- Ensure continued reliable service at a stable, affordable rate by planning for the long term and coordinating with other projects.
- Support planned growth within the community.
- Ensure adequate mixing and dilution of treated wastewater discharged into the Columbia River.
- Manage shoreline stability at the discharge point.
- Enable future decommissioning of Ridgefield’s aging wastewater treatment plant and outfall into Lake River.
Click on picture to enlarge
Click on picture to enlarge
Secondary treatment process improvement illustration.
Construction Activities and Impacts
Construction on secondary treatment process improvements at the treatment plant will begin in 2022 or 2023, depending on permit approval. As construction continues on from the previous projects, you may notice more frequent traffic carrying in workers and materials, with levels varying based on the work planned for any particular day. Construction management staff will be on-site to ensure that the Contractor is in compliance with County standards for hours of operation and noise. More information will be made available as the project design is completed toward the end of 2021.
Click on picture to enlarge
Contact us
- Visit our website: discoverycwa.org
- If you have questions or would like more information about construction:
Thomas Lebo, Alliance Construction Program Manager
(360) 993-8816
If you visited and checked in on each of the previous pages and complete the following questions, we'd love to send you one of these free gifts!
Plush Salmon Gift  | Tumbler Gift  | Canvas Bag Gift  |
Thanks from all of us at the Discovery Clean Water Alliance
 | John Peterson, General Manager |  | To schedule tours for plant neighbors, school groups and other interested parties, contact: |
 | For questions or information related to operational issues, contact: |  | For questions or information related to long-term planning and construction projects, contact: |
