---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-035179"
form_type: "8-K"
ticker: "TTEK"
cik: "0000831641"
company_name: "TETRA TECH INC"
filed_at: "2026-03-26T23:59:59+00:00"
generated_at: "2026-05-15T08:56:41.012568+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

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

## Summary
- 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.

## SEC filing metadata
- accession: 0001104659-26-035179
- form_type: 8-K
- ticker: TTEK
- cik: 0000831641
- company_name: TETRA TECH INC
- filed_at: 2026-03-26T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/831641/000110465926035179/0001104659-26-035179-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/831641/000110465926035179/tm269832d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-035179
- JSON: https://secwatch.observer/filing/0001104659-26-035179.json
- Plain text: https://secwatch.observer/filing/0001104659-26-035179.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.