MWH Constructors, Inc. (MWH) is a leading water and wastewater treatment-focused, general contractor with experience in both municipal and industrial applications. Whether it’s building new facilities, improving infrastructure, or expanding existing systems, MWH has the expertise to successfully fulfill a wide range of client needs. Our experience with a full range of project delivery methods ensures that we can tailor our approach to meet the unique needs of each project.
in water and wastewater technology, with roots going back to 1820, we continue to be at the forefront of advancements in treatment processes and project delivery.
MWH has an expansive nationwide presence, including Slayden Constructors in the Pacific Northwest and Methuen Construction on the East Coast.
In the 19th century, we revolutionized clean water at the turn of a tap, saving countless lives during a deadly cholera outbreak. In the 20th century, we introduced some of the first sewage processing machinery of its kind. In the 21st century, we are among the first to bring Thermal Hydrolysis technology to U.S. soil. For two centuries, we have established ourselves as trailblazers in water and wastewater technology, and we will continue that legacy. Read more about our fascinating, 200-year-old history below.
There is no substitute for honesty and transparency. In all our operations, accountability and follow-through are essential. Our actions are our word. We do the right thing even when it’s hard.
On every project, at every moment, without compromise, safety is our foremost concern. If we see something, we say something.
A reputation for excellence is forged over time. It’s a mindset and a daily practice. We make sure we build projects right the first time, with a commitment to the highest standards of quality and value.
Our daily commitment to the development and implementation of novel ideas and pioneering solutions delivers results.
Business and personal growth are inextricably linked, driving our evolution as a company. At MWH, we take lessons learned to heart and never cease aspiring to better ourselves.
For over 200 years, we have forged new paths and led our industry into the future. Today, we continue that tradition by instilling authentic leadership skills within our teams.
We build customer relationships characterized by mutual trust, cooperation, and responsibility designed to fulfill the needs and realize the goals of our clients. As an organization, we teach and learn from each other, treating each other with confidence and respect.
Our value resides in our people. We seek out rising stars and the brightest experts in the field, supporting their growth through mentorship and individualized training experiences.
With over 200 years of experience in the water and wastewater sector, our leaders ensure that we consistently meet the highest industry standards.
We are dedicated to empowering our teams to act with accountability and transparency while fostering a culture where safety, quality, and collaboration come first. Our approach to leadership is simple: build trust through action, inspire growth, and lead by example.
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.
Read More
On an ordinary afternoon at the Bull Run Water Filtration Project, the conference room hums with energy. Dozens of people gather around long stretches of whiteboards covered in color-coded notes, names, and dates.
Read More
MWH brought back Building Connections in 2026, a focused two-day conference designed for recently hired professionals. The event gave new team members an opportunity to meet company leaders, learn the firm’s history and strategy, and experience what the organization calls “The MWH Way.”
Read More
