As an organization founded by engineers and scientists, Tetra Tech wholly supports Engineers Without Borders USA (EWB-USA) and Engineers Without Borders Canada (EWB Canada) in helping communities in developing countries meet their basic human needs through lasting, scalable projects and technologies.

Tetra Tech's long history of corporate support for both organizations includes financial sponsorship and leadership involvement. As part of this support, Tetra Tech's EWB-USA Grant Program provides funding to individual projects in which Tetra Tech employees are involved. Tetra Tech has established a different program in Canada to raise funds through employee donations to help EWB Canada chapters.