about tetra tech http://www.tetratech.com https://twitter.com/tetratech https://www.facebook.com/tetratech 6 Supporting Sustainability through Our Projects 10 Implementing Sustainable Practices in Our Operations 14 Supporting Sustainability in Our Communities 18 Corporate Sustainability Metrics in this report 4 Tetra Tech’s commitment to sustainability began with the company’s founding and, more than 50 years later, we continue to provide clients with innovative solutions to complex water and environmental challenges.