How many employees work at Tetra Tech?
Tetra Tech, Inc. (TTEK) has approximately 25,339 total employees worldwide as of March 2026, according to Revelio Labs workforce intelligence data. Tetra Tech’s total headcount has grown 0.3% from 25,271 employees in 2023 to 25,339 in 2026.
Is Tetra Tech hiring right now?
Yes, Tetra Tech is actively hiring. Tetra Tech had 3,174 active job postings in 2026, a 2.8% 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 25,339 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 down 1.0% year over year in 2026. Its workforce is concentrated most in North America (41.3%), followed by Northern Europe (18.1%) and Pacific Islands (10.0%).
Tetra Tech's functional groups are Finance and Operations (43.7%), Engineering (29.7%), and Sales and Marketing (26.6%), with Finance and Operations growing fastest (up 1.2%). The average salary is $70,631, ranging from a median of $87,000 in North America to $6,000 in South Asia.
Tetra Tech's active job postings fell 2.8% in 2026 to 3,174. Overall employee sentiment is neutral but declining.
Sourced from Revelio Labs workforce data.
- Ticker
- NASDAQ: TTEK
- Headquarters
- Pasadena, California
- Founded
- 1966
- Industry
- Engineering and Construction Services
- Employees
- 25,339
- YoY
- -1.0% (+72)
As of March 2026
Tetra Tech workforce metrics
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.
Unlock MetricsTetra Tech Annual Employee Count (2023-2026)
- Tetra Tech had 25,339 employees in 2026, a 1.0% decline (+72) from 2025.
- Tetra Tech had 25,299 employees in 2025, a 1.8% decline (-353) from 2024.
- Tetra Tech had 25,652 employees in 2024, a 0.9% increase (+352) from 2023.
- Tetra Tech had 25,300 employees in 2023, a 0.9% increase (+407) from 2022.
Tetra Tech's total workforce has grown from 25,079 employees in 2025 to 25,339 in 2026. Tetra Tech's headcount peaked at 25,652 in 2024 before declining in 2025 and recovering through 2026.
Tetra Tech, Inc. quarterly employee count
| Year | Qtr | Employees | YoY Change | YoY % |
|---|---|---|---|---|
| 2026 | Q1 | 25,339 | +72 | -1.0% |
| 2025 | Q4 | 25,299 | -353 | -1.8% |
| 2025 | Q3 | 25,096 | -551 | -1.9% |
| 2025 | Q2 | 25,079 | -501 | -1.7% |
| 2025 | Q1 | 25,267 | -137 | -0.3% |
| 2024 | Q4 | 25,652 | +352 | +0.9% |
| 2024 | Q3 | 25,647 | +377 | +1.0% |
| 2024 | Q2 | 25,580 | +309 | +1.0% |
| 2024 | Q1 | 25,404 | +386 | +0.9% |
| 2023 | Q4 | 25,300 | +407 | +0.9% |
| 2023 | Q3 | 25,270 | +584 | +1.3% |
| 2023 | Q2 | 25,271 | +829 | +1.5% |
See Tetra Tech's complete headcount history, including quarterly breakdowns.
Get the DataTetra Tech Employee Count by Region (2026)
North America accounts for the largest share of Tetra Tech's global workforce with approximately 41% of total employees, followed by Northern Europe and Pacific Islands.
Tetra Tech employees by region
| Region | Employees | % of Total |
|---|---|---|
| North America | 10,356 | 41.3% |
| Northern Europe | 4,543 | 18.1% |
| Pacific Islands | 2,505 | 10.0% |
| Arab States | 2,229 | 8.9% |
| South Asia | 1,722 | 6.9% |
| Southeast Asia | 1,282 | 5.1% |
| Sub-Saharan Africa | 674 | 2.7% |
| Western Europe | 453 | 1.8% |
| South America | 442 | 1.8% |
| Eastern Europe | 171 | 0.7% |
Drill into city-level data, hiring trends by region, and historic geographic shifts.
Unlock Geographic DataTetra Tech Employee Count by Department (2026)
Tetra Tech's employee groups are Finance and Operations (43.7%), Engineering (29.7%), and Sales and Marketing (26.6%).
Tetra Tech employees by department
| Department | Employees | % of Total |
|---|---|---|
| Finance and Operations | 10,887 | 43.7% |
| Engineering | 7,403 | 29.7% |
| Sales and Marketing | 6,644 | 26.6% |
Compare Tetra Tech's department mix to industry peers.
See Full DataTetra Tech Employee Salary by Region (2026)
Tetra Tech's average employee salary is $70,631 globally. Employees in North America receive the highest compensation, with median pay approximately 1.2x the global average. Pay is lowest in South Asia, at a median of $6,000.
Tetra Tech median employee salary by region (USD)
| Region | Median Salary |
|---|---|
| North America | $87,000 |
| Pacific Islands | $79,000 |
| Northern Europe | $70,000 |
| Western Europe | $55,000 |
| East Asia | $36,000 |
| Southern Europe | $33,000 |
| Central America and the Caribbean | $27,000 |
| Eastern Europe | $22,000 |
| Central and Western Asia | $21,000 |
| Arab States | $20,000 |
| South America | $12,000 |
| Southeast Asia | $11,000 |
| Sub-Saharan Africa | $10,000 |
| North Africa | $9,000 |
| South Asia | $6,000 |
Unlock salary by role, level, and city — and compare to Tetra Tech's industry peers.
Unlock Salary DataTetra Tech Job Openings and Hiring Trends (2023-2026)
- Tetra Tech had 3,174 active job postings in 2026, a 2.8% decline (+659) from 2025.
- Tetra Tech had 2,515 active job postings in 2025, a 34.3% decline (-1,040) 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 1,924 in 2025 and 2,215 in 2024.
Tetra Tech's active job postings fell 2.8% in 2026 to 3,174.
Track new postings per month, role-level demand, and hiring velocity vs. peers.
Unlock Hiring DataTetra Tech Employee Sentiment (2026)
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.
Unlock SentimentSimilar Companies
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Frequently Asked Questions About Tetra Tech
- How fast is Tetra Tech growing?
- In 2026, Tetra Tech's headcount shrank 1.0% to 25,339 employees, up from 25,267 in 2025.
- See the full headcount history
- Where are Tetra Tech employees located?
- Most Tetra Tech employees are based in North America (41.3% of headcount), followed by Northern Europe and Pacific Islands.
- Explore where the workforce is based
- What is the average salary at Tetra Tech?
- The average employee salary at Tetra Tech is approximately $70.6k per year.
- Analyze the salary distribution
- How many new job postings does Tetra Tech open per year?
- In Q1 2026, Tetra Tech opened 6,963 new job postings. In 2025, Tetra Tech opened 23,087 new job postings — about 1,924 per month.
- Track hiring trends by role
- When was Tetra Tech founded and where is it headquartered?
- Tetra Tech was founded in 1966 and is headquartered in Pasadena, California.
- Compare Tetra Tech to industry peers
Speak with a workforce expert about Tetra Tech.
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