Press release

Tetra Tech Wins INFORMS 2019 Edelman Award

Sponsored by Businesswire

Tech, Inc.
(NASDAQ: TTEK) announced today that Tetra Tech and its
client, the Louisville Metropolitan Sewer District (MSD), received the
prestigious INFORMS 2019 Franz Edelman Award for Achievement in Advanced
Analytics, Operations Research, and Management Science. The Edelman
Award is the highest award in operation research and analytics. This
year’s finalists included IBM; Microsoft; the Boston School Board; the
Spanish National Aviation Authority; and Vattenfall, one of Europe’s
largest producers of electricity.

MSD was faced with increasingly frequent and intense rainfall that can
overwhelm urban wastewater collection and treatment systems and threaten
local water environments. MSD partnered with Tetra Tech to implement a
real-time control solution using Csoft®, Tetra Tech’s
software platform that uses data analytics to optimize the management of
sewer networks in real time based on rain forecasts and sensor readings.
The solution realized more than $200 million in savings for the local
community by reducing the cost of capturing wet weather overflows.

Tetra Tech’s researchers developed Csoft as a cost-effective
solution for water utilities to use existing treatment plant storage in
lieu of building additional storage facilities. Csoft enables water
utilities to respond to rainfall and actual system conditions by
maximizing all available storage, conveyance, and treatment capacities.
Excess wastewater is diverted and temporarily stored until it can be
redirected toward the appropriate treatment plant.

“Our partnership with Louisville MSD has resulted in an extraordinary
outcome that applies science to develop more effective solutions that
have long-term benefits to the community,” said Dan Batrack, Tetra Tech
Chairman and CEO. “We are pleased that our team has been recognized by
the INFORMS organization for this landmark application. This award
exemplifies how by Leading with Science®, Tetra
Tech helps communities become more sustainable and resilient.”

Csoft is an adaptable, transportable, and robust solution that is paired
with traditional engineering methods to address the various challenges
inherent to urban water management, including sewer overflows,
stormwater runoff, water quality, flooding, and drought. Tetra Tech has
applied Csoft in major cities around the world.

About the Edelman Award

For more than 40 years, winners of the Edelman
have been recognized for transforming how organizations
approach some of the world’s most complex problems. First awarded in
1972, the prize is named in honor of Franz Edelman, who founded the
Operations Research division within RCA, one of the first corporations
to embed research as a business imperative.

About Tetra Tech

Tetra Tech is a leading provider of high-end consulting and engineering
services for projects worldwide. With more than 18,000 associates
working together, Tetra Tech provides clear solutions to complex
problems in water, environment, infrastructure, resource management,
energy, and international development. We are Leading with Science®
to provide sustainable and resilient solutions for our clients. For more
information about Tetra Tech, please visit,
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 Form 10-Q filings with the Securities and
Exchange Commission.