How many employees work at Tetra Tech?
Tetra Tech, Inc. has 43,577 employees, according to Revelio Labs workforce intelligence data. The YoY growth rate is -4.2%.
Data source: Revelio Labs Coverage: Global workforce Latest update: September 2025
About Tetra Tech
Tetra Tech is a leading, global provider of consulting and engineering services. We are differentiated by Leading with Science® to provide innovative technical solutions to our clients. We support global commercial and government clients focused on water, environment, sustainable infrastructure, renewable energy, and international development. With 27,000 associates worldwide, Tetra Tech provides clear solutions to complex problems. Tetra Tech est un chef de file mondial dans les domaines des services de consultation, des services de l’ingénierie et des services techniques. Grâce à nos solutions novatrices et durables, nous aidons nos clients à composer avec leurs besoins en gestion des eaux, en environnement, en infrastructures, en gestion des ressources, en énergie et en développement international. À travers nos 27 000 associés des quatre coins du monde, Tetra Tech propose des solutions optimales aux problèmes les plus complexes.
As of September 2025
Tetra Tech
workforce metrics
Headcount
43.6k
Avg. Salary
$72.3k
Tenure
5.3yr
Growth Rate
-4.2%
Hiring Rate
Attrition Rate
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Employee Headcount
Interactive chart of Tetra Tech annual worldwide employee count from 2023 to 2025.
- Tetra Tech total number of employees in 2025 was 43,855.257, a 4.2% decline from 2024.
- Tetra Tech total number of employees in 2024 was 45,004.569, a 1.3% increase from 2023.
- Tetra Tech total number of employees in 2023 was 44,502.662, a 2.3% increase from 2022.
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Employee Geographic Breakdown
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Active Job Postings
Interactive chart of Tetra Tech annual active job postings from 2023 to 2025.
- Tetra Tech active job postings in 2025 was 8,401, a 18.7% decline from 2024.
- Tetra Tech active job postings in 2024 was 10,462, a 4.8% increase from 2023.
- Tetra Tech active job postings in 2023 was 9,967, a 7.5% decline from 2022.
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Employee Sentiment
Sentiment Topics
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