what we do


Engineering innovative wastewater treatment solutions

Increasing population, aging infrastructure, and stricter regulations have put pressure on wastewater conveyance and treatment systems. Parametrix develops sustainable, cost-effective solutions. In addition to traditional approaches, we are experienced in designing systems for advanced membrane filtration, reclaimed water, enhanced nutrient systems, and biosolids management. From collection and conveyance to treatment and reuse, we are exploring new ways for our clients to improve their operations and meet today’s challenges.

Parametrix Wastewater - Shelton Wastewater System Improvements, Shelton, Washington
Shelton Wastewater System Improvements
Shelton, Washington
Client: City of Shelton

The City of Shelton had an aging wastewater treatment plant with a restricted outfall into Oakland Bay, a sensitive ecosystem. Parametrix planned and designed multi-phased improvements to the system that would not only the City, but also its project partners, the Department of Corrections (DOC) and Washington State Patrol (WSP). We helped apply for a Community Development Block Grant and funding from other federal, state, and tribal assistance grant programs. The scope of work involved upgrading and expanding the existing plant, upgrading Front Street Pump Station, and a new Kneeland Park Pump Station. A new satellite water reclamation facility serves the City as well as DOC and WSP facilities outside the City limits, and also provides a source of reclaimed water that can be used to recharge the groundwater aquifer. In addition to expanded treatment capacity, the project has improved water quality in Oakland Bay and helped to protect salmon bearing creeks from seeping raw sewage.

  • Project of the Year - Environment $25 - $75 million, APWA Washington Chapter, 2012



"...excellent project management throughout the project to keep the project on schedule and within budget... Your staff did an outstanding job of designing the facilities and managing the construction."

Steven Schuller, PE, former City of Duvall Director of Public Works