Tetra Tech

Pasadena-based water, environment and infrastructure consulting firm

Overview

Tetra Tech provides consulting and engineering services focused on water, environment and infrastructure. Its Fortune figures are for the fiscal year ended 30 September 2025.[17] Revenue was US$5.4bn, up 4.7%, and the company employs 25,000 people.[7] It is headquartered in Pasadena, California.[7]

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