Welcome to Tetra Tech EC, Inc.


Tetra Tech EC, Inc. (TtEC) is a leading provider of consulting, engineering, remediation, and construction services worldwide. We provide our clients with a full range of traditional and innovative services — delivering the best solutions to meet our clients’ needs. TtEC distinguishes itself to our clients by proactively incorporating the following principles through our work processes, operating procedures, and execution methods:

Client Service Quality®
Do It Right®
Shared Vision®
Zero Incident Performance®

TtEC is a wholly owned subsidiary of Tetra Tech Inc., a publicly traded company with annual revenues of more than $2.7 billion and more than 14,000 employees in 350 offices throughout the world.
TtEC’s services and experience are as diverse as the industries and clients we serve throughout the world. From a wind farm in Alaska to environmental restoration in Florida, from remediation in Italy to the construction of military facilities throughout the world, wherever and whatever your project needs, TtEC has the expertise, knowledge, and depth of resources to achieve your strategic and operational goals.
Our corporate headquarters is located in Morris Plains, New Jersey.
Other Tetra Tech companies providing construction services include:
  • Tetra Tech Construction (Gloversville, New York)
  • Tetra Tech Tesoro, Inc. (Virginia Beach, Virginia)
  • Tetra Tech Construction Services, Inc. (Littleton, Colorado)
  • Western Utility Contractors, Inc. (University Park, Illinois)
We welcome the opportunity to serve you.



One Million Safe Work Hours


About Tetra Tech EC, Inc.

  • Commitment to Our Clients
  • Full Life Cycle Services
  • Fully Integrated Services
  • Safe and Responsible
  • Tried and True Processes
  • Long-Term Expertise
  • Stability and Strength
  • The Most Challenging Projects … Anytime, Anywhere

Tetra Tech EC, Inc. Environmental Services Contract GS-10F-0208J