For nearly five decades, W.A. Stephenson Mechanical Contractors Ltd. has been a trusted leader in the construction of water, wastewater, hydroelectric, and energy infrastructure throughout Ontario.

Since 1977, we have delivered complex mechanical focused projects with an unwavering commitment to safety, quality, technical excellence, and dependable performance. Our experienced professionals bring practical field knowledge, innovative thinking, and disciplined project execution to every assignment—from treatment plants and pumping stations to large-diameter process piping, cogeneration systems, and hydroelectric facilities.

We work collaboratively with owners, engineers, other general contractors, and industry partners to overcome challenges, manage risk, and deliver infrastructure that communities depend on every day. Built on integrity and strengthened through lasting relationships, our reputation reflects nearly 50 years of craftsmanship, accountability, and results.

Driven by experience. Built on integrity. Focused on the future.