Insituform Mails Letter to Stockholders: President and CEO Joe Burgess Highlights Strategic Plan

Business Wire, April 30, 2008

Urges Stockholders to Vote FOR Insituform's Experienced Directors and Prevent the Dissident Stockholder from Taking Control of Your Company

CHESTERFIELD, Mo. -- Insituform Technologies, Inc. (Nasdaq Global Select Market: INSU) today announced that J. Joseph "Joe" Burgess, Insituform's President and Chief Executive Officer, has mailed a letter to its stockholders in connection with the Company's May 19, 2008 Annual Meeting of Stockholders.

Insituform also filed with the Securities and Exchange Commission ("SEC") an investor presentation, which is available under the "Investor Relations" section of the Company's website at http://www.insituform.com or at the SEC's website at www.sec.gov. Insituform recommends stockholders vote FOR Insituform's directors on the WHITE proxy card today and reject dissident stockholder Water Asset Management's opposition slate.

The full text of Mr. Burgess' letter follows:

April 30, 2008

Dear Fellow Stockholder:

As you may know, I joined Insituform almost a month ago as your Company's new President and Chief Executive Officer. With this letter, I would like to introduce myself briefly and share with you my thoughts about our business and your Company's potential to create significant value going forward. I am enthusiastic about the opportunities that exist for Insituform and its stockholders, and confident that you have a superior Board and management team working on your behalf.

I bring to Insituform over 20 years of experience in the global water, sewer, energy and petrochemical industries, during the last five of which I managed water and waste water operating services businesses at Veolia Water North America, most recently as President and CEO. Prior to joining Veolia, I was with Covanta Water for approximately 15 years. During my 20 year career I have gained significant experience in the U.S. sewer and water markets, and was involved with a number of major projects in South America, the Caribbean, Europe and Asia. As anyone in the industry can tell you, sewer and water infrastructure in the U.S. is aging and in need of immediate maintenance and repair--the same is increasingly true on a global level. In fact, over the next 25 years, the global unmet demand for sewer and water rehabilitation and infrastructure is conservatively estimated to be more than $22 trillion!

To capitalize on these opportunities, your management team and Board are implementing a strategic plan that has begun to deliver positive results for your Company and its stockholders. This strategic plan reflects my vision, priorities and objectives for Insituform and is designed to improve our operational and financial performance and to profitably grow your Company. Let me share with you what our primary focus will be during the next 12 to 18 months:

* Diversifying Insituform's business by exploiting high growth opportunities in the U.S. sewer rehabilitation market. We are making great strides expanding our customer base in our North American rehabilitation business. Our sales force is broadening its focus beyond traditional urban clients to include new geographies and suburban collar communities - communities located around our existing urban clients. To further diversify our customer base and improve profitability, we are also pursuing more negotiated work and higher margin industrial work.

* Growing internationally and expanding into markets where demand is burgeoning and competition is more limited. We are determined to expand our business into geographies where current infrastructure does not meet current needs. For example, as part of a ten-year plan by the City of Delhi, India to spend approximately $7.5 billion to rehabilitate its sewer and water systems, Insituform was awarded late last year two sewer rehabilitation contracts totaling $35.1 million. Together with our local partners, we are well-positioned to grow rapidly, and I am confident that by penetrating this and other underserved markets, we can achieve double-digit international revenue growth. In addition, we see robust opportunities to expand our United Pipeline Systems[R] gas and oil pipeline rehabilitation business throughout the world and anticipate performing projects on five continents during 2008.

* Continuing to develop products and services that complement our existing businesses and can be marketed through Insituform's global distribution network. We are constantly working to expand and improve our product portfolio. For example, through Insituform Blue[R], our portfolio of products for our potable water pipe rehabilitation business, we have been winning business domestically and internationally. Recent awards include a $4.25 million project to rehabilitate a century-old water main line beneath New York City's Madison Avenue and a $7.7 million project to rehabilitate a water pipeline under and around Hong Kong's Nathan Road. Our I Blue[R] business has extraordinary growth prospects and by demonstrating the cost-effective, non-invasive implementation of our I Blue[R] products, I believe we can achieve $150 million in business within three to five years.