Aegion Corporation Awarded a $6.8 Million Municipal Contract from City of West Palm Beach, Florida

Aegion Corporation (“Aegion” or the “Company”) (Nasdaq Global Select Market: AEGN) today announced the award of a $6.8 million contract from the City of West Palm Beach, Florida for its Insituform Technologies, LLC subsidiary. The City of West Palm Beach evaluated dig and replace, sliplining and cured-in-place pipe (CIPP) solutions before selecting Insituform’s CIPP technology as the method to rehabilitate this pipeline.

Insituform is expected to begin the project in May 2016 with the rehabilitation of approximately 6,000 feet of 48-inch diameter force main sewer pipelines and complete the project by September 1, 2016. A flow bypass system will be set up throughout the project in order to minimize disruption to the community as Insituform crews install the InsituMain® system. This large-diameter pipeline transfers all wastewater from the Town of Palm Beach and the City of West Palm Beach to the East Regional Wastewater Treatment Plant in West Palm Beach.

Aegion’s President and Chief Executive Officer, Charles R. Gordon, said, “The award of this contract is a direct result of our investments in R&D to develop innovative solutions for the pressure pipe rehabilitation market. Our new liner materials provide an effective solution for large-diameter pipelines. We will continue to target this key market with improvements to our existing products and new innovations as well as the patented Fusible PVC® pipe technology offered through our recent acquisition of Underground Solutions, Inc.”

About Aegion Corporation

Aegion Corporation is a global leader in infrastructure protection and maintenance, providing proprietary technologies and services: (i) to protect against the corrosion of industrial pipelines; (ii) to rehabilitate and strengthen water, wastewater, energy and mining piping systems and buildings, bridges, tunnels and waterfront structures; and (iii) to utilize integrated professional services in engineering, procurement, construction, maintenance and turnaround services for a broad range of energy related industries. Aegion’s business activities include manufacturing, distribution, maintenance, construction, installation, coating and insulation, cathodic protection, research and development and licensing. More information about Aegion can be found on our internet site at www.aegion.com.

About Insituform Technologies, LLC

For over forty years, Insituform Technologies, LLC, a subsidiary of Aegion Corporation, has been a global leader in the development and installation of proprietary technologies and services for rehabilitating sewer, water and other underground piping systems without digging or disruption. More information about Insituform Technologies 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. The Company makes forward-looking statements in this news release that represent the Company’s beliefs or expectations about future events or financial performance. These forward-looking statements are based on information currently available to the Company 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 the Company’s Annual Report on Form 10-K for the year ended December 31, 2015, as filed with the Securities and Exchange Commission on February 29, 2016, and in the Company’s subsequent quarterly reports on Form 10-Q. In light of these risks, uncertainties and assumptions, the forward-looking events may not occur. In addition, the Company’s actual results may vary materially from those anticipated, estimated, suggested or projected. Except as required by law, the Company does 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 the Company from time to time in its 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 the Company in this news release are qualified by these cautionary statements.

Aegion®, Fusible PVC®,Insituform®, InsituMain®and the Aegion® logo are the registered trademarks of Aegion Corporation and its affiliates.

(AEGN-GEN)

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