W. M. Lyles Co

W. M. Lyles Co. is an environmental construction contractor serving water, wastewater, energy, and environmental markets across the Western United States, with operations throughout California. Founded in 1945, the company builds infrastructure with an emphasis on safety, reliability, integrity, and sustainable outcomes. Its services span pre-construction planning, construction, self-performance, value engineering, commissioning, and startup, supporting projects from early development through completion.

The company self-performs about 75% of its construction work, including earthwork, concrete, mechanical piping, equipment installation, and startup and commissioning. This hands-on approach gives Lyles direct oversight of field crews, schedule, cost, and quality. Its project delivery experience includes design-build, progressive design-build, and construction management at risk work. The company reports more than $3 billion in completed projects and highlights a safety record with injury rates routinely below industry averages. Lyles works with public agencies and other clients on facilities such as water storage and treatment plants, wastewater facilities, reservoirs, and bioenergy projects, aiming to deliver safe, efficient, high-quality work within budget constraints.