Tetra Tech to Expand its Sustainable Infrastructure Solutions with the Acquisition of Australia-Based Norman Disney & Young

PASADENA, Calif.–(BUSINESS WIRE)–Tetra
Tech, Inc. (NASDAQ: TTEK) announced today that it has signed a
definitive agreement to acquire Norman
Disney & Young (NDY), a leader in sustainable infrastructure
engineering design. Established in 1959, NDY maintains offices
throughout Australia, the Asia-Pacific region, the United Kingdom, and
Canada. NDY incorporates innovative technologies and solutions into
designs, helping to create environments that use less energy, recycle
water, and provide safe and sustainable infrastructure.

“The addition of NDY to our sustainable infrastructure design practice
will enable Tetra Tech to offer technically differentiated solutions to
our commercial and government clients on a global scale,” said Dan
Batrack, Tetra Tech’s Chairman and CEO. “NDY will join our high-end
design team in the United States to provide worldwide coverage and
complementary client relationships.”

“We are very excited to join Tetra Tech,” said Stuart Fowler, NDY’s CEO.
“Tetra Tech expands our ability to provide our high-end services,
provides opportunity for technical collaboration, and adds new clients.
We look forward to further developing the science of sustainable design
and providing industry-leading technical solutions.”

NDY is joining the Commercial and International Business Group’s Asia
Pacific operations. The acquisition will be subject to the satisfaction
of customary closing conditions.

About Norman Disney & Young

NDY is a global engineering design firm of more than 700 professionals
operating across 13 offices in Australia, the United Kingdom, New
Zealand, Hong Kong, and Canada. NDY provides sustainable engineering
design services for the built environment, including commercial offices,
education, health, industrial, mission critical, residential & hotels,
retail and transport facilities. For more information about NDY, please
visit ndy.com.

About Tetra Tech

Tetra Tech is a leading, global provider of consulting and engineering
services. We are differentiated by Leading with Science®
to provide innovative technical solutions to our clients. We support
global commercial and government clients focused on water, environment,
infrastructure, resource management, energy, and international
development. With more than 16,000 associates worldwide, Tetra Tech
provides clear solutions to complex problems. For more information about
Tetra Tech, please visit tetratech.com,
follow us on Twitter (@TetraTech),
or like us on Facebook.

Any statements made in this release that are not based on historical
fact are forward-looking statements. Any forward-looking statements made
in this release represent management’s best judgment as to what may
occur in the future. However, Tetra Tech’s actual outcome and results
are not guaranteed and are subject to certain risks, uncertainties and
assumptions (“Future Factors”), and may differ materially from what is
expressed. For a description of Future Factors that could cause actual
results to differ materially from such forward-looking statements, see
the discussion under the section “Risk Factors” included in the
Company’s Form 10-K and 10-Q filings with the Securities and Exchange
Commission.

Contacts

Tetra Tech, Inc.
Jim Wu, Investor Relations
Charlie
MacPherson, Media & Public Relations
(626) 470-2844