How many employees work at Tetra Tech?
Tetra Tech, Inc. (TTEK) has approximately 31,774 total employees worldwide as of March 2026, according to Revelio Labs workforce intelligence data. Tetra Tech's total headcount has declined 0.4% from 31,917 employees in 2023 to 31,774 in 2026.
Data source: Revelio LabsCoverage: Global workforce, 2023–2026Published July 2026
Is Tetra Tech hiring right now?
Yes, Tetra Tech is actively hiring. Tetra Tech had 3,167 active job postings in 2026, a 3.0% decline from 2025 — see job openings & hiring trends.
About Tetra Tech's Workforce
Tetra Tech, Inc. (TTEK) is an Engineering and Construction Services company that employs 31,774 people worldwide as of March 2026. It is the 6th-largest by headcount among its peers. Founded in 1966, the company is headquartered in Pasadena, California and trades on the NASDAQ.
Tetra Tech's workforce has held roughly steady from 2023 to 2026, though it is up 0.2% year over year in 2026. Its workforce is concentrated most in the United States (32.5%), followed by the United Kingdom (16.6%) and Australia (9.0%), with Ireland, its fastest-growing location.
Tetra Tech's largest functional groups are Finance and Operations (43.6%), Engineering (29.8%), and Sales and Marketing (26.6%), with Finance and Operations growing fastest (up 1.8%). Median employee tenure is 4.5 years. The average salary is $70,131, ranging from a median of $87,000 in Northern America to $6,000 in Southern Asia.
Tetra Tech's active job postings fell 3.0% in 2026 to 3,167. Overall employee sentiment is neutral but declining.
Sourced from Revelio Labs workforce data.
As of March 2026
Tetra Tech
workforce metrics
Headcount
31.8k
0.2% YoY
Avg. Salary
$70.1k
0.9% YoY
Tenure
4.5yr
0.3yr YoY
Growth Rate
0.2%
1.3pts YoY
Hiring Rate
Attrition Rate
Unlock hiring rate, attrition rate, and 12 additional workforce metrics for Tetra Tech. Compare to peers, export the dataset, and access the full quarterly history.
- Tetra Tech had 31,774 employees in 2026, a 0.2% increase (+63) from 2025.
- Tetra Tech had 31,686 employees in 2025, a 1.6% decline (-521) from 2024.
- Tetra Tech had 32,207 employees in 2024, a 0.8% increase (+271) from 2023.
- Tetra Tech had 31,936 employees in 2023, a 1.4% increase (+456) from 2022.
Tetra Tech's total workforce has grown from 31,403 employees in 2025 to 31,774 in 2026. Tetra Tech's headcount peaked at 32,287 in 2024 before declining in 2025 and recovering through 2026.
Tetra Tech, Inc. — quarterly employee count (2023–2026)
| Year | Qtr | Employees | YoY Change | YoY % |
|---|---|---|---|---|
| 2026 | Q1 | 31,774 | +63 | +0.2% |
| 2025 | Q4 | 31,686 | -521 | -1.6% |
| 2025 | Q3 | 31,452 | -835 | -2.6% |
| 2025 | Q2 | 31,403 | -837 | -2.6% |
| 2025 | Q1 | 31,711 | -336 | -1.1% |
| 2024 | Q4 | 32,207 | +271 | +0.8% |
| 2024 | Q3 | 32,287 | +375 | +1.2% |
| 2024 | Q2 | 32,240 | +323 | +1.0% |
| 2024 | Q1 | 32,047 | +421 | +1.3% |
| 2023 | Q4 | 31,936 | +456 | +1.4% |
| 2023 | Q3 | 31,912 | +648 | +2.1% |
| 2023 | Q2 | 31,917 | +934 | +3.0% |
Want to see Tetra Tech's complete headcount history back to 2008, including quarterly breakdowns?
The United States accounts for the largest share of Tetra Tech's global workforce with approximately 33% of total employees, followed by the United Kingdom and Australia. Tetra Tech's headcount in Ireland is growing fastest among its major locations, up 11.5% year over year in 2026.
Tetra Tech employees by country — 2026
| Country | Employees | % of Total | YoY % |
|---|---|---|---|
| United States | 10,373 | 32.5% | -1.9% |
| United Kingdom | 5,313 | 16.6% | +6.1% |
| Australia | 2,858 | 9.0% | +1.4% |
| Canada | 2,790 | 8.7% | +4.4% |
| Oman | 2,326 | 7.3% | +0.3% |
| India | 1,480 | 4.6% | +1.1% |
| Indonesia | 1,093 | 3.4% | -0.0% |
| Ireland | 643 | 2.0% | +11.5% |
| Netherlands | 387 | 1.2% | +14.7% |
| Brazil | 378 | 1.2% | +8.0% |
Drill into city-level data, hiring trends by region and historic geographic shifts
Tetra Tech's largest employee groups are Finance and Operations (43.6%), Engineering (29.8%), and Sales and Marketing (26.6%).
Tetra Tech employees by department — 2026
| Department | Employees | % of Total | YoY % |
|---|---|---|---|
| Finance and Operations | 13,801 | 43.6% | +1.8% |
| Engineering | 9,453 | 29.8% | +1.7% |
| Sales and Marketing | 8,430 | 26.6% | +0.3% |
Compare Tetra Tech's department mix to industry peers.
Tetra Tech's average employee salary is $70,131 globally. Employees in Northern America receive the highest compensation, with median pay approximately 1.2x the global average. Pay is lowest in Southern Asia, at a median of $6,000.
Tetra Tech median employee salary by region — 2026 (USD)
| Region | Median Salary |
|---|---|
| Northern America | $87,000 |
| Pacific Islands | $79,000 |
| Northern Europe | $70,000 |
| Western Europe | $56,000 |
| Eastern Asia | $36,000 |
| Southern Europe | $34,000 |
| Central America and the Caribbean | $25,000 |
| Eastern Europe | $22,000 |
| Central and Western Asia | $21,000 |
| Arab States | $20,000 |
| Southern America | $12,000 |
| Sub-Saharan Africa | $10,000 |
| Northern Africa | $10,000 |
| South-Eastern Asia | $10,000 |
| Southern Asia | $6,000 |
Unlock salary by role, level, and city — and compare to Tetra Tech's industry peers.
- Tetra Tech had 3,167 active job postings in 2026, a 3.0% decline (+653) from 2025.
- Tetra Tech had 2,514 active job postings in 2025, a 34.3% decline (-1,041) from 2024.
- Tetra Tech had 3,555 active job postings in 2024, a 14.0% increase (+465) from 2023.
- Tetra Tech had 3,090 active job postings in 2023, a 3.0% increase from 2022.
- Hiring velocity in 2026: 2,321 new roles/month, up from 1,927 in 2025 and 2,217 in 2024. New metric
Tetra Tech's active job postings fell 3.0% in 2026 to 3,167.
Track new postings per month, role-level demand, and hiring velocity vs. peers.
Revelio Labs tracks employee sentiment across Tetra Tech's workforce based on public professional data. Overall sentiment is neutral and has declined year over year in 2026.
Overall
Unlock the full sentiment breakdown by department, tenure, and trend over time.
Similar Engineering and Construction Services Companies by Employee Count
- How fast is Tetra Tech growing?
- In 2026, Tetra Tech's headcount grew 0.2% to 31,774 employees, up from 31,711 in 2025.
- Where are Tetra Tech employees located?
- Most Tetra Tech employees are based in the United States (32.5% of headcount), followed by the United Kingdom and Australia.
- What is the average salary at Tetra Tech?
- The average employee salary at Tetra Tech is approximately $70.1k per year.
- How many people does Tetra Tech hire per year?
- In 2026, Tetra Tech opened roughly 27,852 new roles — about 2,321 per month.
- When was Tetra Tech founded and where is it headquartered?
- Tetra Tech was founded in 1966 and is headquartered in Pasadena, California.
See something that doesn't look right? Reach out and our team will review it.