ST. LOUIS, MO, November 21, 2011 – Aegion Corporation (Nasdaq Global Select Market: AEGN) announced today that its subsidiary, Insituform Technologies, Inc., has been awarded a $5.6 million contract from the City of Crest Hill, Illinois.   

Insituform expects to install approximately 135,000 feet of small- to medium-diameter Insituform® cured-in-place pipe (CIPP) in residential neighborhoods throughout Crest Hill, beginning in January 2012. 

“Since the first CIPP installation in 1971, Insituform has completed projects around the world. Using this global experience, our operations and project management teams are focused on working to provide solutions that make sense in every community. The rehabilitation of the wastewater pipelines in Crest Hill will provide its citizens with a solution that restores structural integrity. We expect the citizens of Crest Hill will experience minimal disruption throughout this project.” said Ken Foster, Vice President and General Manager for Insituform.

Aaron E. Fundich, Principal Engineer for Robinson Engineering said, “Robinson Engineering has been working with the City of Crest Hill since 2008 to develop a solution to address ongoing structural deficiencies and inflow/infiltration issues for a pipeline system that has received minimal maintenance since its installation over 50 years ago.  Insituform® CIPP was selected to rehabilitate over 25 miles of aging pipelines because of the non-disruptive installation method as well as its capability to increase flow capacity, improve structural capability and reduce infiltration.”

It is expected that Insituform’s proprietary air inversion steam cure installation method will be used throughout the project. This installation method reduces energy and water usage by approximately 95 percent.

About Aegion Corporation
Aegion Corporation is a global leader in infrastructure protection, providing proprietary technologies and services to protect against the corrosion of industrial pipelines and for the rehabilitation and strengthening of sewer, water, energy and mining piping systems and buildings, bridges, tunnels and waterfront structures. More information about Aegion can be found on its internet site at www.aegion.com.

About Insituform Technologies, Inc.
Insituform Technologies, Inc., a subsidiary of Aegion Corporation, is a leader in global pipeline protection. Insituform provides proprietary technologies and services for the rehabilitation of wastewater and water pipelines. More information about Insituform can be found on its internet site at www.insituform.com.

Forward-Looking Statements
The Private Securities Litigation Reform Act of 1995 provides a “safe harbor” for forward-looking statements. We make forward-looking statements in this new release that represent our beliefs or expectations about future events or financial performance. These forward-looking statements are based on information currently available to us and on management’s beliefs, assumptions, estimates or projections and are not guarantees of future events or results. When used in this document, the words, “anticipate,” “estimate,” “believe,” “plan,” “intend,” “may,” “will” and similar expressions are intended to identify forward-looking statements, but are not the exclusive means of identifying such statements. Such statements are subject to known and unknown risks, uncertainties and assumptions, including those referred to in the “Risk Factors” section of our Annual Report on Form 10-K for the year ended December 31, 2010, as filed with the Securities and Exchange Commission under the name Insituform Technologies, Inc. on February 28, 2011, and in our subsequent quarterly reports on Form 10-Q. In light of these risks, uncertainties and assumptions, the forward-looking events may not occur. In addition, our actual results may vary materially from those anticipated, estimated, suggested or projected. Except as required by law, we do not assume a duty to update forward-looking statements, whether as a result of new information, future events or otherwise. Investors should, however, review additional disclosures made by us from time to time in its periodic filings with the Securities and Exchange Commission. Please use caution and do not place reliance on forward-looking statements. All forward-looking statements made by us in this news release are qualified by these cautionary statements.

Insituform^®, Aegion™ the Insituform^® log and the Aegion™ logo are the trademarks of Aegion Corporation and its affiliates.

For more information, contact:
David F. Morris
Senior Vice President and Chief Administrative Officer
636-530-8000