Company Insights
Published on
April 22, 2026

How Many People Work at Tetra Tech? Headcount and Employee Trends

Total Employees
30000
7.2% from last year
0
New Hires (YTD)
66
5% of total workforce
Departments
19
650 in Engineering
Locations
567
5,012 in New York, NY
  • Tetra Tech, headquartered in Pasadena, California, is a leading provider of high-end consulting and engineering services focused on water, environment, and sustainable infrastructure, with a strong market position reflected in its $1.21 billion revenue for Q1 FY26.
  • In the past year, Tetra Tech has expanded its capabilities through acquisitions, including Halvik, which enhances its data analytics and resilient infrastructure optimization services, and has raised its fiscal year 2026 revenue and EPS guidance following strong financial performance.
  • Recently, Tetra Tech was awarded an £18 million contract by Northern Ireland Water to provide water and wastewater sampling services, highlighting its role as a key player in water quality protection and regulatory compliance.
  • Tetra Tech's ideal buyers are government agencies and utilities focused on sustainable infrastructure and water management, as they address critical pain points related to water quality and environmental sustainability, making them a compelling partner for organizations looking to enhance operational efficiency.

Tetra Tech Headcount Breakdown by Department

Tetra Tech's workforce is organized across 19 departments, with Operations leading at 1,549 employees, followed by Information Technology with 925 and Executive roles at 461. This distribution indicates a strong emphasis on operational efficiency and technological support, essential for the engineering and construction industry. The presence of Community and Social Services at 449 employees further highlights the company's commitment to social responsibility alongside its core engineering functions.

Operations
1549
Information Technology
925
Executive
461
Community And Social Services
449
Engineering
301
Finance
205
Marketing
112
Human Resources
98
Education
62
Other
1689

Tetra Tech Employees by Location

Tetra Tech operates from 567 locations, with the largest concentration in Pasadena, CA, housing 260 employees. Other significant locations include Denver, CO, with 99 employees, and Arlington, VA, with 93. The substantial number of employees categorized under 'Other' (3,099) suggests a distributed workforce model, allowing for flexibility and coverage across various regions, while also indicating a strategic focus on local project needs.

Pasadena, CA
260
Denver, CO
99
Arlington, VA
93
Orlando, FL
91
Houston, TX
74
Pittsburgh, PA
73
Chicago, IL
73
Boston, MA
59
Morris Plains, NJ
47
Other
3099
Get more information on people and companies with Unify

Unify is an all-in-one platform for intent data, enrichment, prospecting, and account research. Learn more about Tetra Tech and other companies with our data sources and AI agents.

Get started with Unify