Insituform Technologies Awarded Two Contracts in Honolulu, Hawaii for Combined Value of $9.9 Million

Insituform Technologies, Inc. (Nasdaq Global Select Market: INSU) announced today that it has been awarded two contracts with a combined value of approximately $9.9 million to rehabilitate nearly 7,000 feet of pipeline for the City and County of Honolulu, Hawaii. Since the 1980s, Insituform has installed over 300,000 feet of cured-in-place pipe (CIPP) in Hawaii.

The first contract, the Waikiki Sewer Rehabilitation/Reconstruction project, requires Insituform to install its cured-in-place pipe (CIPP) solution in approximately 3,700 feet of 10-inch to 24-inch diameter pipelines in Waikiki. Insituform also will install over 3,200 feet of 36-inch and 42-inch diameter pipelines for the Makaha Interceptor Sewer Rehabilitation/Replacement Project. These projects are designed to structurally rehabilitate aging sewer lines in Waikiki and in the Makaha system.

Ken Foster, Vice President and General Manager for Insituform, stated, “We have successfully completed approximately 170 projects in Hawaii since the 1980s and are confident that our project experience on the island will allow us to exceed the expectations of the City and County of Honolulu as well as its residents and tourists as we complete this project. Since these projects are located near tourist shopping areas on Waikiki Beach and in residential areas near Waikiki, we expect to perform the installations at night as much as possible. Our focus will be to quickly complete this project in order to minimize any disruption to tourists and local businesses.”

About Insituform Technologies, Inc.

Insituform Technologies, Inc. is a global leader in pipeline protection. Insituform provides proprietary technologies and services for rehabilitating sewer, water, energy and mining piping systems and the corrosion protection of industrial pipelines. More information about the Company 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, 2010, as filed with the Securities and Exchange Commission 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 any duty to update forward-looking statement, 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 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 the Company in this news release are qualified by these cautionary statements.

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