This project for Washoe County consists of two phases delivered under eight GMPs under a Construction Management-at-Risk delivery model, Phase 1A: Expansion of Huffaker Hills Reservoir. The effluent reservoir was raised 27 vertical feet, providing the Owner with an additional 2,000-acre feet of available effluent storage. The scope included grub and clearing, mass excavation and handling / processing 150,000 cubic yards of material, and placing 1.4 million square feet of liner. The expanded reservoir stores treated effluent during the fall / winter months and distributes it to end users during the spring / summer months for irrigation purposes. The project was completed under budget and ahead of schedule.
Phase 1B: Facility Upgrades and Expansion. Currently under construction, this project will expand the existing sewage treatment capacity from an average daily flow of 4.1 MGD to 6.0 MGD. The scope includes: upgrading/expanding existing headworks, demolishing abandoned headworks structures, constructing new grit removal and blower building, refurbishing existing blower building, yard piping and site electrical, constructing new Bioreactors3&4 and upgrading existing Bioreactors 1&2, replacing digester blowers, site dewatering, upgrading Export, Field Creek, RAS/WAS, and Effluent Pump Stations, and making miscellaneous site improvements. The project is currently on schedule for completion in 2025.
“MWH is the CMAR for Washoe County’s Expansion Project at the South Truckee Meadows Water Reclamation Facility. They have been effective and professional in providing pre-construction services. Specifically, the County values their knowledge and recommendations to minimize risk associated with supply chain demands and cost escalation during these unprecedented times.”
This digital thread ensures that design engineers, construction teams, operations staff, and City leadership all work from the same validated foundation of information. In an environment as utility-dense as a 50-year-old wastewater treatment plant, this visibility is essential.
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In January, MWH officially launched its Women in Construction chapter—an exciting milestone for the company and a meaningful step forward for representation across our jobsites, offices, and leadership teams. The launch reflects a growing commitment to elevating the voices and experiences of women who contribute to every part of our work.
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MWH delivers a fully integrated Commissioning & Startup (C&SU) program that begins in preconstruction and carries through final acceptance and operator handover. Unlike traditional approaches where commissioning is treated as a late-stage activity, MWH embeds commissioning into every phase of project delivery, ensuring systems are designed, constructed, tested, and optimized as a cohesive whole.
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