--- title: Tres Rios WRF Capacity and Effluent Quality Upgrade | Project Spotlight image: https://info.watercollaborativedelivery.org/hubfs/Tres%20Rios%201%20landing%20page-1.jpg --- [![WCDA_horz_tag_RGB](https://info.watercollaborativedelivery.org/hs-fs/hubfs/WCDA_horz_tag_RGB.png?width=250&height=129&name=WCDA_horz_tag_RGB.png "WCDA_horz_tag_RGB")](https://www.watercollaborativedelivery.org) # Tres Rios Wastewater Reclamation Facility Capacity and Effluent Quality Upgrade **CMAR | MWH Constructors and Jacobs **   The Tres Rios WRF Capacity and Effluent Quality Upgrade Project is the largest construction project completed in Pima County’s history. It satisfies the Clean Water Act’s stringent environmental regulatory requirements, meets RWRD’s long-term service needs, and augments precious water supplies for this growing desert community.   ![Tres Rios 1 landing page](https://info.watercollaborativedelivery.org/hubfs/Tres%20Rios%201%20landing%20page.jpg) ## Download this project spotlight to learn more: - How the team met an ambitious schedule to come in under budget and three months ahead of regulatory deadlines - The amazing archeological discovery unearthed during this project - Planning and execution challenges that had to be overcome Copyright © 2026 Water Collaborative Delivery Association [Privacy Policy](https://watercollaborativedelivery.org/privacy-policy/)     [mailto:info@WaterCollaborativeDelivery.org](mailto:info@WaterCollaborativeDelivery.org)