Investor Presentation

June 2021

WATER

ENVIRONMENT

SUSTAINABLE INFRASTRUCTURE

RENEWABLE ENERGY

Forward Looking Statements &

Non-GAAP Financial Measures

Certain statements contained in this presentation are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These statements involve risks and uncertainties, such as those related to fluctuations in the Company's quarterly operating results and stock price, and the other risks detailed from time to time in the Company's SEC reports.

To supplement the financial results presented in accordance with generally accepted accounting principles in the United States ("GAAP"), we present certain non-GAAP financial measures within the meaning of Regulation G under the Securities Exchange Act of 1934, as amended. We provide these non-GAAP financial measures because we believe they provide a valuable perspective on our financial results. However, non-GAAP measures have limitations as analytical tools and should not be considered in isolation and are not in accordance with, or a substitute for, GAAP measures. In addition, other companies may define non-GAAP measures differently which limits the ability of investors to compare non-GAAP measures of Tetra Tech to those used by our peer companies. A reconciliation of these non-GAAP financial measures to the most directly comparable GAAP financial measures is available at investor.tetratech.com.

2

Our Business: Leading with Science®

2020: $3.0B Revenue

17,000 Clients | 65,000 Projects

450 OFFICES WORLDWIDE | 20,000 ASSOCIATES

Water

Environment

Sustainable Infrastructure

Renewable Energy

PREMIER GLOBAL CONSULTING AND ENGINEERING FIRM

3

Industry Rankings: Leading Market Positions

Water

Environmental

Desalination

Solid Waste

Management

#1

#1

#1

#1

18 years in a row

12 years in a row

7 years in a row

8 years in a row

International

High Performance

Renewable

Development

Buildings

Energy

4

Tetra Tech Sustainability Program Climate Positive - Carbon Negative

2010 - 2020 Results

0.89 metric tons CO2e/associate: down 78%

data on the cloud -

100%

51%

82%

reduced energy

enterprise-wide

health and safety

TRIR

and increased

administrative

improved

cybersecurity

systems

2021 - 2030 Goals

  • Climate Positive - Carbon Negative by 2030
  • Initiating Project Impact Reporting:

1.

GHG emissions (CO2e Tons)

Renewable

People

2.

Water (H2O Megaliters)

Energy

E

Water

3.

Renewable energy (Gigawatts)

Carbon

4.

Land and water habitat (Hectares)

Habitat

  1. One Billion People Challenge

G

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Disclaimer

Tetra Tech Inc. published this content on 27 May 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 01 June 2021 13:24:03 UTC.