Welcome to W. M. Lyles Co.

Progress Through Performance

W. M. Lyles Co. is a heavy-civil and utility contractor with a successful record of performance, safety, and reliability. For more than 70-years, W. M. Lyles Co. has performed its work with integrity, honesty, and a careful eye on the needs of our owners, employees, and environment. With hundreds of successfully performed projects in the wastewater, sewer, and clean water delivery sectors, W. M. Lyles Co. is proud to know that our work positively affects our communities, friends, and families.

W. M. Lyles Co. has become an industry leader in the construction of both private and public water and wastewater treatment plants. Our “open book” approach to the construction of these plants has allowed us to assist owners in their growing need for a Design-Build Project Delivery System.

W. M. Lyles Co. remains a leading contractor in our State for the installation of pipelines and underground utilities. With a network of offices covering California, W. M. Lyles Co. has performed work ranging from: the infrastructure for five state/county prison sites, the first producing ethanol facility west of Colorado, large water banking systems, pump stations, gas distribution, underground utilities and structures of all shapes and sizes, and renewable energy projects. Our work varies greatly within our long list of owners and partners; please review our “Projects” section to see the variety of the work we perform.

2016 Newsletter


ENR Top 400 Contractor #259

ENR Top 200 Environmental Firm #44

California Top Contractor #39

2016 Top 200 CA Contractor

ENR Top 200 Environmental Firm #44

Top 200 2016

Featured Projects

California American Water Lippi & Rockhurst Well Site Improvements


Work generally consisted of replacement of hydro tank, design and modification of tank supports to comply with seismic standards

Spring Valley Lakes Water Treatment Improvements


The primary focus of this project was demolition and replacement of an aging bolted steel potable water storage tank and associated foundation.

Fairfield-Suisun Sewer District Slide Gate Replacement Project


Work generally consisted of furnishing and installing four new Type 316L stainless steel heavy duty slide gates to replace existing aluminum slide gates, which were experiencing severe galvanic corrosion.

Central Contra Costa Sanitary District Sludge Blending Tank Repairs


The work generally consisted of saw-cutting and demolition of approximately 200 square feet of gunnite around the top edge of the existing concrete Sludge Blending Tank while in service and installation of grout transition from new to existing work.

Stirling Bluffs Water Treatment Plant Improvements


The primary work on the project included a building addition and two new trains of vertical clarifier/filter vessels with associated piping.