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Tetra Tech
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CEO Salary Employees Revenue per Employee Net Income per Employee

Tetra Tech's Number of Employees (2016 - 2025)

  • In fiscal year 2025, the total number of employees at Tetra Tech was 25,000. The employee count decreased by 5,000 from 30,000 (in 2024) to 25,000 (in 2025). It represents a -16.67% year-over-year decline in employee count.

    • Over the past 10 years (2016 - 2025):
  • The highest number of employees at Tetra Tech was 30,000 in fiscal year 2024.
  • The lowest number of employees was 16,000 in fiscal year 2017.
  • The average number of employees was 21,300.

    • Learn more about Tetra Tech's Revenue by Segment and Revenue by Region.

    Check out competitors to Tetra Tech in a side-by-side comparison.

    Explore additional financial metrics for Tetra Tech.


    Definition of employee :
  • An Employee is any individual who renders service to the business as per the mutual agreement in exchange for a fixed remuneration. Refer to our glossary for more details, examples, and formulas.
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Tetra Tech's Employees Trend

2025

Tetra Tech's number of employees was 25,000 in fiscal year 2025.

2024

Tetra Tech's number of employees was 30,000 in fiscal year 2024.

2023

Tetra Tech's number of employees was 27,000 in fiscal year 2023.

2022

Tetra Tech's number of employees was 21,000 in fiscal year 2022.

2021

Tetra Tech's number of employees was 21,000 in fiscal year 2021.

2020

Tetra Tech's number of employees was 20,000 in fiscal year 2020.

2019

Tetra Tech's number of employees was 20,000 in fiscal year 2019.

2018

Tetra Tech's number of employees was 17,000 in fiscal year 2018.

2017

Tetra Tech's number of employees was 16,000 in fiscal year 2017.

2016

Tetra Tech's number of employees was 16,000 in fiscal year 2016.

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Tetra Tech's Employees (Year-over-Year Change)

2025

Tetra Tech's number of employees decreased -16.67 % during fiscal year 2025 compared to 2024.
It represents a decline of 5,000 employees from 30,000 (in 2024) to 25,000 (in 2025).

2024

Tetra Tech's number of employees increased 11.11 % during fiscal year 2024 compared to 2023.
It represents a increase of 3,000 employees from 27,000 (in 2023) to 30,000 (in 2024).

2023

Tetra Tech's number of employees increased 28.57 % during fiscal year 2023 compared to 2022.
It represents a increase of 6,000 employees from 21,000 (in 2022) to 27,000 (in 2023).

2022

Tetra Tech's number of employees remained unchanged during fiscal year 2022 compared to 2021.
It represents no change in employees from 21,000 (in 2021) to 21,000 (in 2022).

2021

Tetra Tech's number of employees increased 5 % during fiscal year 2021 compared to 2020.
It represents a increase of 1,000 employees from 20,000 (in 2020) to 21,000 (in 2021).

2020

Tetra Tech's number of employees remained unchanged during fiscal year 2020 compared to 2019.
It represents no change in employees from 20,000 (in 2019) to 20,000 (in 2020).

2019

Tetra Tech's number of employees increased 17.65 % during fiscal year 2019 compared to 2018.
It represents a increase of 3,000 employees from 17,000 (in 2018) to 20,000 (in 2019).

2018

Tetra Tech's number of employees increased 6.25 % during fiscal year 2018 compared to 2017.
It represents a increase of 1,000 employees from 16,000 (in 2017) to 17,000 (in 2018).

2017

Tetra Tech's number of employees remained unchanged during fiscal year 2017 compared to 2016.
It represents no change in employees from 16,000 (in 2016) to 16,000 (in 2017).

2016

Tetra Tech's number of employees increased 23.08 % during fiscal year 2016 compared to 2015.
It represents a increase of 3,000 employees from 13,000 (in 2015) to 16,000 (in 2016).

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Tetra Tech Employee Count History

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Period Employees Year-over-Year Change
2025 25,000 -5,000 16.67%
2024 30,000 3,000 11.11%
2023 27,000 6,000 28.57%
2022 21,000 0 0%
2021 21,000 1,000 5%
2020 20,000 0 0%
2019 20,000 3,000 17.65%
2018 17,000 1,000 6.25%
2017 16,000 0 0%
2016 16,000 3,000 23.08%

Frequently Asked Questions

How many employees does Tetra Tech have?

In the fiscal year 2025, Tetra Tech's number of employees was 25,000.

What was the annual change in Tetra Tech's number of employees?

Tetra Tech's number of employees decreased by -16.67 % in 2025 compared to 2024.

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