Insituform Technologies Announces New Joint Ventures with Wasco Energy

Insituform Technologies, Inc. (Nasdaq Global Select Market: INSU) announced today the creation of two joint ventures with Wasco Energy Ltd. (“Wasco”). Wasco, a subsidiary of Wah Seong Corporation Berhad, is based in Kuala Lumpur, Malaysia and is widely recognized as the world’s second largest provider of pipe coating, insulation and protection services to the oil and gas industries.

The first joint venture, Bayou Wasco Insulation Technologies, LLC (“Bayou Wasco Insulation”), which will be based in New Iberia, Louisiana, was organized to provide offshore insulation services, primarily to customers in the United States, the Gulf of Mexico, Central America and the Caribbean. The joint venture, which is owned 51% by Insituform and 49% by Wasco, combines Wasco's expertise in the insulation market with the operational, sales and logistics capabilities of The Bayou Companies, LLC, a subsidiary of Insituform. Bayou Wasco Insulation will provide energy customers a full complement of thermal insulation coating services for offshore flow assurance including poly-urethane foam and syntactic poly-propylene. The facilities are expected to be operational by the early 2012.

The second joint venture, which will be known as WCU Corrosion Technologies Pte. Ltd. (“WCU Corrosion Technologies”), will be based in Singapore and provide the product and service offerings of Corrpro Companies and United Pipeline Systems, each an Insituform subsidiary, throughout Asia. Corrpro Companies offers a comprehensive line of fully-integrated corrosion protection products and services primarily in North America, Europe and the Middle East. United Pipeline Systems is a global leader in providing high-density polyethylene (HDPE) lining systems for internal pipeline protection including United’s proprietary Tite Liner® and Safetyliner™ product and service offerings. WCU Corrosion Technologies, which will be owned 51% by Wasco and 49% by Insituform, combines the product and service offerings of Corrpro Companies and United Pipeline Systems with the operational, sales and logistics capabilities of Wasco in Asia. The joint venture is expected to immediately begin marketing its products and services.

J. Joseph Burgess, President and Chief Executive Officer of Insituform, said “Wasco's technical expertise in the insulation market complements Bayou's long-standing expertise and relationships in the coatings industry. In addition, Bayou’s strategic location in the Port of Iberia, Louisiana brings tremendous opportunity to the joint venture to market and ship insulation orders throughout the Gulf and to Central America and the Caribbean. We are confident that these joint ventures will strengthen and expand our energy and mining platform in these important growth markets. With deeper offshore drilling, the market for high-quality thermal insulation is expanding rapidly. These new businesses will allow us to serve our existing customers operating in the United States, the Gulf of Mexico, Central America and the Caribbean with an expanded insulation offering and also provide an expanded product offering to Wasco’s customers in Asia.”

Giancarlo Maccagno, Wasco’s Deputy Managing Director, said “Wasco is excited to partner with Insituform and its family of energy and mining companies to bring the Tite Liner® technology to Asia. In addition, Corrpro's expertise as a leader in the cathodic protection industry further augments our existing business. Wasco is pleased to partner with Bayou Companies to provide Wasco’s insulation solutions to customers in the United States, the Gulf of Mexico, Central America and the Caribbean. Wasco will immediately begin marketing these solutions to our customers.”

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.

About Wasco Energy Ltd.

Wasco Energy Ltd is a global leader in pipe coating solutions for oil, gas and water industries. Strategically located in Kuantan, Malaysia and with other coatings plants in China, West Africa and the Middle East, Wasco is able to efficiently and economically supply coated pipe all over the world. More information about Wasco Energy can be found on its internet site at www.wascoenergy.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 a 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.

Insituform®, Bayou™, Corrpro®, United Pipeline Systems®, Tite Liner®, Safetyliner™ and the Insituform® logo are the registered and unregistered trademarks of Insituform Technologies, Inc. or its affiliates. WASCO® is the registered trademark of Wah Seong Corporation Berhad or its affiliates.