The Leighton


Leighton has a 60-year legacy specializing in geotechnical, environmental, and materials testing and inspection services.

The Leighton difference lies in our expertise, our passion, and our people.

We provide reliable data, regulatory knowledge and relationships, viable options, and balanced strategies – consistently delivering solutions you can build on.

A Legacy of Reliability.

Leighton’s depth of experience and in-house capabilities allow us to meet project schedules while saving time and costs through value engineering.

An Industry


Our success is demonstrated by thousands of projects, repeat clients, longevity of our professionals, and engineering excellence recognized through project awards and accolades.


Data Resources.

Working for six decades, Leighton has built an extensive library of geologic and contaminant data based on exploration projects throughout California. Capitulating on this institutional knowledge supports our ability to fast-track project deliverables with proven innovative solutions.

Strong Forward


Our future success is driven by the opportunities we provide to our employees. Learn more about our Culture and Leadership, and our Life @ Leighton.

60 Years: A Strong Foundation.

The Leighton Legacy spans 60 years of solutions you can build on.

Scroll through our interactive timeline below
to discover the milestones that have shaped the Leighton team into who we are today.