Tetra Tech appoints Eric W. Thornburg to Board of Directors; effective March 30, 2026

TETRA TECH INC

Thornburg to serve on Compensation Committee and Nominating and Corporate Governance Committee.
Board expands to eight members; Thornburg recently retired as CEO of H20 America (formerly SJW Group).
Annual non-employee director compensation: $110,000 retainer, $2,000 per meeting over eight, $175,000 equity award (60% PSUs, 40% RSUs) prorated.
Thornburg brings over 40 years of water industry leadership, including CEO roles at Connecticut Water Service and American Water Works.

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