FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q, including the "Management's Discussion and Analysis of Financial Condition and Results of Operations," contains forward-looking statements regarding future events and our future results that are subject to the safe harbor provisions created under the Securities Act of 1933 and the Securities Exchange Act of 1934. All statements other than statements of historical facts are statements that could be deemed forward-looking statements. These statements are based on current expectations, estimates, forecasts and projections about the industries in which we operate and the beliefs and assumptions of our management. Words such as "expects," "anticipates," "targets," "goals," "projects," "intends," "plans," "believes," "estimates," "seeks," "continues," "may," variations of such words, and similar expressions are intended to identify such forward-looking statements. In addition, statements that refer to projections of our future financial performance, our anticipated growth and trends in our businesses, and other characterizations of future events or circumstances are forward-looking statements. Readers are cautioned that these forward-looking statements are only predictions and are subject to risks, uncertainties and assumptions that are difficult to predict, including those identified below under "Part II, Item 1A. Risk Factors," and elsewhere herein. Therefore, actual results may differ materially and adversely from those expressed in any forward-looking statements. We undertake no obligation to revise or update publicly any forward-looking statements for any reason.

GENERAL OVERVIEW

Tetra Tech, Inc. is a leading global provider of consulting and engineering services that focuses on water, environment, sustainable infrastructure, resource management, energy, and international development. We are a global company that is Leading with Science® to provide innovative solutions for our public and private clients. We typically begin at the earliest stage of a project by identifying technical solutions and developing execution plans tailored to our clients' needs and resources.

Our reputation for high-end consulting and engineering services and our ability to develop solutions for water and environmental management has supported our growth for more than 55 years. Today, we are proud to be making a difference in people's lives worldwide through broad consulting, engineering, and technology service offerings. In fiscal 2020, we worked on over 65,000 projects, in more than 100 countries on seven continents, with a talent force of 20,000 associates. We are Leading with Science® throughout our operations, with domain experts across multiple disciplines supported by our advanced analytics, artificial intelligence, machine learning, and digital technology solutions. Our ability to provide innovation and first-of-kind solutions is enhanced by partnerships with our forward-thinking clients. We are diverse and inclusive, embracing the breadth of experience across our talented workforce worldwide with a culture of innovation and entrepreneurship. We are disciplined in our business delivering value to customers and high performance to our shareholders. In supporting our clients, we seek to add value and provide long-term sustainable consulting, engineering, and technology solutions.

By combining ingenuity and practical experience, we have helped to advance sustainable solutions for managing water, protecting the environment, providing energy, and engineering the infrastructure for our cities and communities.

We derive income from fees for professional, technical, program management, and construction management services. As primarily a professional services company, we are labor-intensive rather than capital-intensive. Our revenue is driven by our ability to attract and retain qualified and productive employees, identify business opportunities, secure new and renew existing client contracts, provide outstanding services to our clients and execute projects successfully. We provide services to a diverse base of U.S. state and local government, U.S. federal government, U.S. commercial, and international clients.


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The following table presents the percentage of our revenue by client sector:



                                           Three Months Ended
                                     December 27,         December 29,
                                         2020                 2019
Client Sector
U.S. state and local government               16.3  %           15.5  %
U.S. federal government (1)                   34.8              30.8
U.S. commercial                               20.6              22.7
International (2)                             28.3              31.0
Total                                        100.0  %          100.0  %


(1) Includes revenue generated under U.S. federal government contracts performed outside the United States. (2) Includes revenue generated from foreign operations, primarily in Canada, Australia, the United Kingdom, and revenue generated from non-U.S. clients.

We manage our operations under two reportable segments. Our Government Services Group ("GSG") reportable segment primarily includes activities with U.S. government clients (federal, state and local) and all activities with development agencies worldwide. Our Commercial/International Services Group ("CIG") reportable segment primarily includes activities with U.S. commercial clients and international clients other than development agencies. Additionally, we continue to report the results of the wind-down of our non-core construction activities in the Remediation and Construction Management ("RCM") reportable segment. Substantially, there has been no remaining backlog for RCM since fiscal 2018 as the projects were complete.

Government Services Group ("GSG"). GSG provides consulting and engineering services primarily to U.S. government clients (federal, state and local) and development agencies worldwide. GSG supports U.S. government civilian and defense agencies with services in water, environment, sustainable infrastructure, information technology, and disaster management. GSG also provides engineering design services for U.S. municipal and commercial clients, especially in water infrastructure, solid waste, and high-end sustainable infrastructure designs. GSG also leads our support for development agencies worldwide, especially in the United States, United Kingdom, and Australia.

Commercial/International Services Group ("CIG"). CIG primarily provides consulting and engineering services to U.S. commercial clients, and international clients that include both commercial and government sectors. CIG supports commercial clients across the Fortune 500, energy utilities, industrial, manufacturing, aerospace, and resource management markets. CIG also provides infrastructure and related environmental, engineering and project management services to commercial and local government clients across Canada, in Asia Pacific (primarily Australia and New Zealand), the United Kingdom, as well as Brazil and Chile.



The following table presents the percentage of our revenue by reportable
segment:

                                     Three Months Ended
                               December 27,         December 29,
                                   2020                 2019
Reportable Segment
GSG                                     61.2  %           57.3  %
CIG                                     40.7              44.0

Inter-segment elimination               (1.9)             (1.3)
Total                                  100.0  %          100.0  %


Our services are performed under three principal types of contracts with our clients: fixed-price, time-and-materials, and cost-plus. The following table presents the percentage of our revenue by contract type:


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                              Three Months Ended
                        December 27,         December 29,
                            2020                 2019
Contract Type
Fixed-price                      35.9  %           34.0  %
Time-and-materials               46.4              48.7
Cost-plus                        17.7              17.3
Total                           100.0  %          100.0  %


Under fixed-price contracts, clients agree to pay a specified price for our performance of the entire contract or a specified portion of the contract. Under time-and-materials contracts, we are paid for labor at negotiated hourly billing rates and paid for other expenses. Under cost-plus contracts, some of which are subject to a contract ceiling amount, we are reimbursed for allowable costs and fees, which may be fixed or performance-based. Profitability on these contracts is driven by billable headcount and our cost control. We recognize revenue from contracts using the cost-to-cost measure of progress method to estimate the progress towards completion to determine the amount of revenue and profit to recognize. Changes in those estimates could result in the recognition of cumulative catch-up adjustments to the contract's inception-to-date revenue, costs and profit in the period in which such changes are made. On a quarterly basis, we review and assess our revenue and cost estimates for each significant contract. Changes in revenue and cost estimates could also result in a projected loss that would be recorded immediately in earnings.

Other contract costs include professional compensation and related benefits, together with certain direct and indirect overhead costs such as rents, utilities, and travel. Professional compensation represents a large portion of these costs. Our "Selling, general and administrative expenses" ("SG&A") are comprised primarily of marketing and bid and proposal costs, and our corporate headquarters' costs related to the executive offices, finance, accounting, administration, and information technology. Our SG&A expenses also include a portion of stock-based compensation and depreciation of property and equipment related to our corporate headquarters, and the amortization of identifiable intangible assets. Most of these costs are unrelated to specific clients or projects, and can vary as expenses are incurred to support company-wide activities and initiatives.

We experience seasonal trends in our business. Our revenue and operating income are typically lower in the first half of our fiscal year, primarily due to the Thanksgiving (in the U.S.), Christmas, and New Year's holidays. Many of our clients' employees, as well as our own employees, take vacations during these holiday periods. Further, seasonal inclement weather conditions occasionally cause some of our offices to close temporarily or may hamper our project field work in the northern hemisphere's temperate and arctic regions. These occurrences result in fewer billable hours worked on projects and, correspondingly, less revenue recognized.

ACQUISITIONS AND DIVESTITURES

Acquisitions. We continuously evaluate the marketplace for acquisition opportunities to further our strategic growth plans. Due to our reputation, size, financial resources, geographic presence and range of services, we have numerous opportunities to acquire privately and publicly held companies or selected portions of such companies. We evaluate an acquisition opportunity based on its ability to strengthen our leadership in the markets we serve, the technologies and solutions they provide, and the additional new geographies and clients they bring. Also, during our evaluation, we examine an acquisition's ability to drive organic growth, its accretive effect on long-term earnings, and its ability to generate return on investment. Generally, we proceed with an acquisition if we believe that it will strategically expand our service offerings, improve our long-term financial performance, and increase shareholder returns.

We view acquisitions as a key component in the execution of our growth strategy, and we intend to use cash, debt or equity, as we deem appropriate, to fund acquisitions. We may acquire other businesses that we believe are synergistic and will ultimately increase our revenue and net income, strengthen our ability to achieve our strategic goals, provide critical mass with existing clients, and further expand our lines of service. We typically pay a purchase price that results in the recognition of goodwill, generally representing the intangible value of a successful business with an assembled workforce specialized in our areas of interest. Acquisitions are inherently risky, and no assurance can be given that our previous or future acquisitions will be successful or will not have a material adverse effect on our financial position, results of operations, or cash flows. All acquisitions require the approval of our Board of Directors. For detailed information regarding acquisitions, see Note 4, "Acquisitions" of the "Notes to Consolidated Financial Statements".


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Divestitures. We regularly review and evaluate our existing operations to determine whether our business model should change through the divestiture of certain businesses. Accordingly, from time to time, we may divest or wind-down certain non-core businesses and reallocate our resources to businesses that better align with our long-term strategic direction.

OVERVIEW OF RESULTS AND BUSINESS TRENDS

General. As the coronavirus disease 2019 ("COVID-19") spread globally, we responded quickly to ensure the health and safety of our employees, clients and the communities we support. Our high-end consulting focus and the technologies we deployed have allowed our staff to support clients and projects remotely without interruption. We remain focused on providing clients with the highest level of service and our 450 global offices are operational, supporting our programs and projects. By Leading with Science®, we are responding to the challenges of COVID-19, with the commitment of our 20,000 staff supported by technological innovation. Our government business, which represents approximately 60% of our revenue, has been stable, while our commercial business experienced relatively more impact. Much of our commercial business has continued due to regulatory drivers, but we have seen project delays in the industrial sectors. Our diversified end-markets have allowed us to redeploy staff to areas of uninterrupted or increased demand, and we have made decisions to align our cost structures with our clients' projects. The actions we have taken to navigate through this worldwide pandemic, the strength of our balance sheet, and our technical leadership position us well to address the global challenges of providing clean water, environmental restoration, and the impacts of climate change.

In first quarter of fiscal 2021, our revenue decreased 4.1% compared to the prior-year period. Our revenue includes contributions from acquisitions that did not contribute to our revenue in the first quarter of fiscal 2020. Our year-over-year revenue comparisons were also impacted by the decision to dispose of our Canadian turn-key pipeline activities in the fourth quarter of fiscal 2019 and the subsequent wind-down of those activities in fiscal 2020, which included the disposal of related equipment.

U.S. State and Local Government. Our U.S. state and local government revenue increased 0.9% in the first quarter of fiscal 2021 compared to the same period last year. This comparison was impacted by a reduction in subcontractor activity. Our U.S. state and local revenue, net of subcontractor costs, increased 11.0% in the first quarter of fiscal 2021 compared to the first quarter of fiscal 2020. This increase reflects continued broad-based growth in our U.S. state and local government project-related infrastructure business, particularly with increased revenue from municipal water infrastructure work in the metropolitan areas of California, Texas, and Florida. Most of our work for U.S. state and local governments relates to critical water and environmental programs, which we expect to increase further next year. However, further budgetary constraints to our clients could negatively impact our business. Conversely, increased disaster response activity could cause our fiscal 2021 revenue to exceed our current expectations.

U.S. Federal Government. Our U.S. federal government revenue increased 8.4% in the first quarter of fiscal 2021 compared to the prior-year period. This increase includes the contributions from acquisitions completed in fiscal 2020. These contributions were partially offset by reduced international development activities as COVID-19 travel restrictions have caused some project delays. During periods of economic volatility, our U.S. federal government business has historically been the most stable and predictable. We expect our U.S. federal government revenue to grow modestly in fiscal 2021 due to continued increased federal advanced analytics activity. However, U.S. federal spending amounts and priorities could change significantly from our current expectations, which could have a significant positive or negative impact on our fiscal 2021 revenue.

U.S. Commercial. Our U.S. commercial revenue decreased 13.1% in the first quarter of fiscal 2021 compared to the same period last year. This decline was primarily due to reduced industrial activity as a result of the COVID-19 pandemic. We currently expect the adverse impact of the COVID-19 pandemic to our U.S. commercial revenue to continue to be more significant than to our U.S. government programs and projects throughout most of this fiscal year.

International. Our international revenue decreased 12.4% in the first quarter of fiscal 2021 compared to the prior-year period. Excluding the impact of the aforementioned prior-year disposal of our Canadian turn-key pipeline activities, our international revenue decreased 10.2% in the first quarter of fiscal 2021 compared to the same period last year. The revenue decline primarily reflects the adverse impact of the COVID-19 pandemic, partially offset by increased renewable energy activity in Canada. In light of the COVID-19 pandemic, we currently expect our overall international government work to be stable for fiscal 2021; however, our international commercial activities could have a significant adverse impact if the current economic conditions due to COVID-19 are prolonged.


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