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Slayden, in partnership with MWH Constructors, worked alongside the City of Spokane to deliver major upgrades to the Riverside Park Water Reclamation Facility, helping the community protect and restore the health of the Spokane River. The project centered on adding a Next Level of Treatment (NLT) system, featuring advanced membrane filtration technology that significantly improves effluent quality and reduces pollutants before water is returned to the river.
The NLT system was designed to remove 99 percent of the phosphorus from the plant’s discharge while also capturing heavy metals, PCBs, and other contaminants. Built to treat an average wastewater flow of 50 MGD, the new filtration process enables the facility to consistently meet Class A reclaimed water standards. This high quality, treated water can now be reused for irrigation, dust control, industrial processes, wetland enhancement, and groundwater recharge supporting long term sustainability across the region.
The upgraded facility reflects Spokane’s commitment to cleaner waterways and showcases Slayden’s dedication to building resilient, environmentally responsible infrastructure for the communities we serve.
“This was the City’s fist alternative delivery project and we found that we received tremendous value during preconstruction. MWH/Slayden provided extensive value engineering and constructability ideas that resulted in $9.1M in accepted savings. Their experience in wastewater projects led to a good understanding of project details resulting in the project operating within the allocated budgets.”
Slayden earned First Place in the 2025 AGC Construction Safety Excellence Awards (CSEA) in the Utility Infrastructure Category — Under 500,000 Work Hours.
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Slayden Constructors and Jacobs Engineering recently completed a $78 million expansion of the Robert A. Duff Water Treatment Plant for the Medford Water Commission. The project boosts capacity from 45 to 65 million gallons per day and adds advanced filtration, a new reservoir, a modern pump station, and seismic‑resilient redundancies. This upgrade strengthens long‑term water reliability for Medford and the greater Rogue Valley, supporting regional growth and public health.
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Slayden’s Jeff Wall recently achieved a unique milestone. At the Pacific Northwest Clean Water Association (PNCWA) conference in Spokane, Washington, Jeff became the first contractor to be chosen under the PNCWA to join the Select Society of Sanitary Sludge Shovelers, also known as the 5S society. Members are selected based on “outstanding, meritorious service above and beyond the call of duty.” As recognition for this achievement, Jeff received a one-of-a-kind -5S gold shovel award.
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