United States was the largest of Tetra Tech Inc’s 5 reported lines in fiscal 2025, at $3.45B — 63% of $5.44B.
| Geography | FY 2009 | FY 2010 | FY 2011 | FY 2012 | FY 2013 | FY 2014 | FY 2015 | FY 2016 | FY 2017 | FY 2018 | FY 2019 | FY 2020 | FY 2021 | FY 2022 | FY 2023 | FY 2024 | FY 2025 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| United States | $2.42B | $2.86B | $3.20B | $3.45B | |||||||||||||
| Sales Revenue, Services, Net | — | — | — | — | |||||||||||||
| Foreign Countries | $1.09B | — | — | — | |||||||||||||
| United Kingdom | — | $601.16M | $711.62M | $771.72M | |||||||||||||
| Australia | — | $449.51M | $529.11M | $489.10M | |||||||||||||
| Canada | — | $436.22M | $498.58M | $512.30M | |||||||||||||
| Other Countries | — | $172.03M | $260.55M | $223.63M | |||||||||||||
| Total | $3.50B | $4.52B | $5.20B | $5.44B |
In fiscal 2025, which ended September 28, 2025, the 5 regions Tetra Tech Inc reported in this breakdown added up to $5.44B. That was up 4.7% from $5.20B in fiscal 2024. United States was the largest region, at $3.45B or 63.3% of the total, followed by United Kingdom ($771.72M, 14.2%) and Canada ($512.30M, 9.4%). Together, the two largest regions made up 77.5% of this total.
Compared with fiscal 2024, United Kingdom grew the fastest, rising 8.4% to $771.72M. Other Countries fell the most, down 14.2% to $223.63M.
United Kingdom (fiscal 2023), Australia (fiscal 2023), Canada (fiscal 2023) and Other Countries (fiscal 2023) were first reported as separate regions during this period. The table also keeps 2 regions that Tetra Tech Inc no longer reports, so earlier years can still be read on their original basis; use "Show 2 discontinued" beneath the table to see them. This breakdown covers every fiscal year from 2009 to 2025, as reported in Tetra Tech Inc's annual filings.
Cig was the largest of Tetra Tech Inc’s 2 reported lines in fiscal 2025, at $2.84B — 52% of $5.52B.
| Segment | FY 2010 | FY 2011 | FY 2012 | FY 2013 | FY 2014 | FY 2015 | FY 2016 | FY 2017 | FY 2018 | FY 2019 | FY 2020 | FY 2021 | FY 2022 | FY 2023 | FY 2024 | FY 2025 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gsg | $1.82B | $2.16B | $2.48B | $2.67B | ||||||||||||
| Cig | $1.74B | $2.42B | $2.79B | $2.84B | ||||||||||||
| Rme | — | — | — | — | ||||||||||||
| Wei | — | — | — | — | ||||||||||||
| Tss | — | — | — | — | ||||||||||||
| Sales Revenue, Services, Net | — | — | — | — | ||||||||||||
| Ecs | — | — | — | — | ||||||||||||
| Rcm | — | — | — | — | ||||||||||||
| Inter-Segment Elimination | — | — | — | — | ||||||||||||
| Total | $3.56B | $4.58B | $5.27B | $5.52B |
In fiscal 2025, which ended September 28, 2025, the 2 segments Tetra Tech Inc reported in this breakdown added up to $5.52B. That was up 4.7% from $5.27B in fiscal 2024. Cig was the largest segment, at $2.84B or 51.5% of the total, followed by Gsg ($2.67B, 48.5%).
Compared with fiscal 2024, Gsg grew the fastest, rising 7.7% to $2.67B. Over fiscal 2022 to 2025, revenue across these segments went from $3.56B to $5.52B, a compound annual growth rate of 15.7%. Cig's share of the total rose from 48.8% to 51.5% over the same years.
The table also keeps 7 segments that Tetra Tech Inc no longer reports, so earlier years can still be read on their original basis; use "Show 7 discontinued" beneath the table to see them. This breakdown covers every fiscal year from 2010 to 2025, as reported in Tetra Tech Inc's annual filings.
International was the largest of Tetra Tech Inc’s 4 reported lines in fiscal 2025, at $2.03B — 37% of $5.44B.
| Customer | FY 2009 | FY 2010 | FY 2011 | FY 2012 | FY 2013 | FY 2014 | FY 2015 | FY 2016 | FY 2017 | FY 2018 | FY 2019 | FY 2020 | FY 2021 | FY 2022 | FY 2023 | FY 2024 | FY 2025 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| U.S. Government | $1.06B | $1.39B | $1.68B | $1.72B | |||||||||||||
| U.S. Federal Government | — | — | — | — | |||||||||||||
| Sales Revenue, Services, Net | — | — | — | — | |||||||||||||
| International | $1.09B | $1.66B | $2.00B | $2.03B | |||||||||||||
| Commercial | $748.95M | $869.46M | $909.64M | $899.30M | |||||||||||||
| U.S. Commercial | — | — | — | — | |||||||||||||
| U.S Commercial | — | — | — | — | |||||||||||||
| U.S. State & Local Government | $603.29M | $607.07M | $613.19M | $789.97M | |||||||||||||
| Total | $3.50B | $4.52B | $5.20B | $5.44B |
In fiscal 2025, which ended September 28, 2025, the 4 revenue lines Tetra Tech Inc reported in this breakdown added up to $5.44B. That was up 4.7% from $5.20B in fiscal 2024. International was the largest revenue line, at $2.03B or 37.4% of the total, followed by U.S. Government ($1.72B, 31.6%) and Commercial ($899.30M, 16.5%). Together, the two largest revenue lines made up 69.0% of this total.
Compared with fiscal 2024, U.S. State & Local Government grew the fastest, rising 28.8% to $789.97M. Commercial fell the most, down 1.1% to $899.30M. Over fiscal 2022 to 2025, revenue across these revenue lines went from $3.50B to $5.44B, a compound annual growth rate of 15.8%. International's share of the total rose from 31.0% to 37.4% over the same years.
The table also keeps 4 revenue lines that Tetra Tech Inc no longer reports, so earlier years can still be read on their original basis; use "Show 4 discontinued" beneath the table to see them. This breakdown covers every fiscal year from 2009 to 2025, as reported in Tetra Tech Inc's annual filings.
Tetra Tech Inc (TTEK) breaks its revenue down by region, segment and revenue line. In fiscal 2025, its largest region was United States, with $3.45B or 63.3% of the total, followed by United Kingdom at $771.72M (14.2%).
United States was Tetra Tech Inc's largest region in fiscal 2025, with $3.45B in revenue, 63.3% of the $5.44B reported across its 5 regions.
Cig was Tetra Tech Inc's largest segment in fiscal 2025, with $2.84B in revenue, 51.5% of the $5.52B reported across its 2 segments.
International was Tetra Tech Inc's largest revenue line in fiscal 2025, with $2.03B in revenue, 37.4% of the $5.44B reported across its 4 revenue lines.
Of the Tetra Tech Inc regions reported in both fiscal 2024 and fiscal 2025, and making up at least 2% of the total, United Kingdom grew the fastest, rising 8.4% from $711.62M to $771.72M.
Every figure is taken from Tetra Tech Inc's annual financial filings and shown as reported: each line keeps the name the company gives it, years follow its own fiscal calendar, and lines it has stopped reporting stay in the table for the years they were reported.
The breakdown by region covers fiscal 2009 to 2025. The latest four fiscal years are free to view, and the full history is available with a Business Quant subscription.