General Engineering Contractors

We Build Infrastructure Through Partnerships

For over 40 years, Conco West, Inc. has proudly served public agencies and private developers throughout California’s Central Valley and Bay Area, specializing in the construction of critical water infrastructure. As a heavy general engineering and design-build contractor, we are experts in building essential systems that support safe and reliable water delivery—pump stations, well sites, storage tanks, treatment facilities, and conveyance systems.

Our Story

Founded in 1978, Conco West began as a subcontractor specializing in structural concrete. As demand for our services grew, we expanded our capabilities to include underground utilities and mechanical piping and pumping systems, evolving into a full-service general contractor. Pump station and water treatment infrastructure projects remain at the core of our construction portfolio. Projects such as the Industrial Tank 13 and Pump Station exemplify the type of work we continue to focus on—projects where we remain highly competitive within our market. Under the leadership of Mike DeRousse and John Onken—each with over 38 years at Conco West—we continue our legacy of delivering high-quality, cost-effective water infrastructure solutions, driven by a steadfast commitment to safety, integrity, teamwork, and performance.

What Sets Us Apart

  • Experience That Delivers:
    Our success is built on deep industry knowledge, long-tenured staff, and a hands-on leadership team. Over 50% of our core team has been with us for more than 18 years, and our average employee tenure is 9+ years.
  • Collaborative Approach:
    We engage early in the design and bidding phases, working alongside owners and engineers to identify challenges and implement smart, cost-saving solutions before construction even begins.
  • Commitment to Quality & Budget:
    From planning to closeout, we prioritize schedule, budget, safety, and quality at every stage—delivering projects on time and within budget without compromising workmanship or Safety

Safety & Environmental Commitment

Safety is Our Culture

At Conco West, safety is more than a policy, it’s woven into everything we do. We proactively evaluate every task to protect our team, subcontractors, and the public. Our safety program includes:

  • Advanced safety software tools for planning, JHAs, incident reporting, and employee evaluations
  • Ongoing training and awareness to strengthen our safety-first culture
  • A proven track record and low employee turnover
Building Excellence

Environmental Responsibility

We’re committed to minimizing our environmental impact by maintaining a modern, CARB-compliant fleet of equipment, primarily featuring CAT machinery with GPS technology. This investment improves:

  • Productivity and precision
  • Fuel efficiency
  • Emission reduction

By staying ahead of regulatory standards and leveraging smart technology, we ensure our work supports both environmental sustainability and project efficiency.

Let’s Build Better Water Systems—Together

Whether you’re planning a municipal water project or private development, Conco West, Inc.,Conco West, Inc., brings decades of specialized expertise, dedicated people, and a proven track record of success to every job.