MWH Constructors is a heavy civil construction firm focused almost entirely on water and wastewater infrastructure, headquartered in Broomfield, Colorado with operations across the United States, Canada and the United Kingdom. The company works predominantly under collaborative delivery models, including progressive design-build and construction management at risk, on treatment plants that have to keep operating while they are rebuilt. MWH Constructors Canada holds a one-third stake in Red River Biosolids Partners, the joint venture with Aecon and Oscar Renda Contracting awarded a CAD $815 million progressive design-build contract in July 2026 for new biosolids facilities at Winnipeg’s North End Water Pollution Control Centre, one of the largest water infrastructure upgrades in North America.
Beyond the Broomfield headquarters at 8001 Arista Place, MWH staffs offices in Phoenix, Arizona and St. Petersburg, Florida, and reaches further through two operating companies: Slayden Constructors in the Pacific Northwest and Methuen Construction on the East Coast. For an owner in Oregon or New Hampshire, the practical effect is a local builder backed by a national water group.
Four delivery models, chosen per project
MWH publishes its position on four approaches rather than pushing a single one. Under CMAR, the owner sits in on design and constructability decisions, and the firm often splits work into multiple guaranteed maximum prices, work packages or phases to accommodate long-lead equipment procurement and reduce exposure. Design-Build and EPC follow an integrated model the company traces back to the 1800s and the steam-powered Nottingham Bestwood Pumping Station. Design-bid-build stays in the portfolio on purpose. And Program Manager at Risk, which the firm calls out as a specialty, extends a GMP commitment across an entire multi-project capital program instead of a single job.
Where a project sits in that spectrum drives everything downstream, so the firm offers to walk owners through the trade-offs directly. MWH is a member of the Water Collaborative Delivery Association and points clients to WCDA procurement guides and sample documents as a neutral second opinion.
Services across the project life
The expertise areas listed are preconstruction, construction, commissioning and startup, construction management, technology, safety, and quality. Commissioning and startup deserves attention on water and wastewater work specifically, because a treatment plant that is structurally complete but not proven against permit limits is not a finished project.
On the technology side, the firm cites 4D modeling and BIM-driven risk mitigation used to find inter-project dependencies early, and self-performance of critical scopes to keep direct control of quality and safety.
Two centuries of treatment work
The lineage claim is unusually specific. MWH points to 19th-century work delivering clean water during a cholera outbreak, early sewage processing machinery in the 20th century, and being among the first to bring thermal hydrolysis technology to the United States in the 21st.
Recent and ongoing work spans municipal and industrial: the South Truckee Meadows Water Reclamation Facility 202 expansion, Logan Wastewater Treatment Plant, the City of Cape Coral facility and utility expansion programs, the L.L. Anderson Dam spillway modification, a semiconductor wastewater advanced treatment and reuse facility, and an ISO 4 cleanroom expansion.
